CN102538730B - For monitoring monitoring unit and the method for the position signalling of incremental counter measurement equipment - Google Patents

Abstract

The present invention relates to measure for monitoring incremental counter the monitoring unit of position signalling of equipment, wherein apply at least two position signalling at input side, these position signallings are from by obtaining the scanning element scanning to increment indexing track and having phase shift each other.Monitoring unit includes signal computing unit and analytic unit, utilize this signal computing unit can generate the status data word that at least two is relevant with position from different position signallings, described status data word is fed to this analytic unit, in this analytic unit by compare status data word can determine that disarmed state and determined by can generate error signal in the case of disarmed state.The invention still further relates to the method for monitoring position signalling.

Description

For monitoring monitoring unit and the method for the position signalling of incremental counter measurement equipment

Technical field

The present invention relates to measure the monitoring unit of position signalling and the method for equipment for monitoring incremental counter.Such monitoring unit or this method allow to have identified the error of position signalling in position measurement apparatus.

Background technology

Incremental counter is measured equipment and is especially widely popularized in the case of lathe and in automatic technology.Incremental counter measures equipment for determining the relative position of two objects moved each other.Here, in principle length measurement device and Angle Measuring Equipment are made a distinction.Length measurement device is such as determining the relative position of two machine part moved each other of lathe.For this, such as there is the material measure (Ma verk rperung) of scale form of increment indexing track (Inkrementalteilungsspur) be connected with in two objects and scanning element is connected with another in two objects, thus obtain the scanning signal relevant with position by scanning increment indexing track, may determine that two objects degree one another along increment indexing track motion by means of these scanning signals.

Angle Measuring Equipment also constructs according to identical principle with known in the title of rotary encoder (Drehgeber).But here, round disk replaces scale as material measure, the girth of this round disk applies increment indexing track.This disk is torsionally connected with axle to be measured, and this is fixedly mounted by scanning element.

The generation of position signalling can be such as optics, magnetic, inductance or electric capacity based on different physical scan principles at this.

When the increment by means of scanning element scan period property indexes track, produce at least two phase shift each other, periodic, analog position signal at outlet side, be analyzed these position signallings determining increment indexing track and the relative position of scanning element.Increment indexing track and scanning element are preferably designed to so that position signalling is sine-shaped when moving speed (Verfahrgeschwindigkeit) is constant as much as possible.Described one side of analyzing is by carrying out the indexing cycle count of increment indexing track, and another aspect is carried out by segmenting periodic position signalling further within the indexing cycle.

Especially problematic, when the characteristic of one or more position signallings such as changes due to aging effect, the analysis of position signalling may failure.This may especially signal amplitude at position signalling occur when becoming less or skew occur.Often for analytic unit be difficulty with or the most likely determine, whether position measurement apparatus is to damage or index whether not actually exist relative motion between track in scanning element and increment.

Summary of the invention

Therefore the task of the present invention is, a kind of device is described, utilizes this device can identify the error of the position signalling in incremental counter measurement equipment.

This task is solved by monitoring unit according to claim 1.The Advantageous details of this monitoring unit is drawn by the claim being subordinated to claim 1.

Currently proposed a kind of for monitoring the monitoring unit that incremental counter measures the position signalling of equipment, being in input side at this monitoring unit and apply at least two position signalling, these position signallings obtain from by means of the scanning element scanning to increment indexing track and have phase shift each other.Described monitoring unit includes signal computing unit and analytic unit, utilize this signal computing unit can generate the status data word that at least two is relevant with position from different position signallings, be fed to described analytic unit with described status data word, wherein by compare status data word can determine that invalid state and determined by can generate error signal in the case of disarmed state.

It addition, the task of the present invention is that a kind of method is described, utilize the error of position signalling in the method identification incremental counter measurement equipment.

This task is solved by method according to claim 10.The Advantageous details of the method draws by being subordinated in the claim of claim 10.

Propose a kind of for monitoring, by means of monitoring unit, the method that incremental counter measures the position signalling of equipment, input lateral described monitoring unit conveying at least two position signalling, these position signallings obtain and have each other phase shift from by means of the scanning element scanning to increment indexing track, and wherein said method has the following step:

Generate, from different position signallings, the status data word that at least two is relevant with position in signal computing unit (Signalverkn ü pfungseinheit),

By comparing the disarmed state determining described status data word in analytic unit, and

In analytic unit determined by generate error signal in the case of disarmed state.

Accompanying drawing explanation

Other advantages and the details of the present invention draw from following description with reference to the accompanying drawings.At this

Fig. 1 illustrates the block diagram of the first embodiment of the position measurement apparatus with monitoring unit of the present invention,

Fig. 2 illustrates the block diagram of the second embodiment of the position measurement apparatus with monitoring unit of the present invention, and

Fig. 3 illustrates the block diagram of the 3rd embodiment of the position measurement apparatus with monitoring unit of the present invention.

Detailed description of the invention

Fig. 1 illustrates the block diagram of the position measurement apparatus 10 with monitoring unit 200 of the present invention.Indexing carrier 12 exists the increment indexing track 14 scanned by scanning element 16.Whether it is that indexing carrier 12 is configured to scale or is configured to round disk for measuring the linear or equipment of rotational motion according to position measurement apparatus 10.In the first scenario, scale is such as positioned at the first machine part and surface sweeping unit 16 is positioned at the second machine part.In the latter case, round disk is the most torsionally connected with axle and this is arranged by scanning element 16 statically.When the first machine part is relative to the second machine part relative motion on the direction of increment indexing track 14 or when axle rotates, producing position signalling in scanning element 16, analyzing of described position signalling allows the statement about relative change in location.Generally also set up the device determining reference position for (such as by crossing reference marker).After determining reference position, it is referred to reference position to determine the scanning element 16 absolute position relative to increment indexing track 14.

If the relative motion between increment indexing track 14 and scanning element 16 is carried out with constant speed, then position signalling is sine-shaped the most as much as possible and has cycle duration, and this cycle duration is corresponding to the indexing cycle of increment indexing track 14.The position measurement apparatus of its scanning element known generation two position signalling of phase shift 90 ° each other.Equally exist the position measurement apparatus of the position signalling processing three phase shifts 120 °.It has been demonstrated that particularly advantageously, scanning element produces the position signalling of four phase shifts 90 ° separately from each other, especially because by the signal of two phase shifts of differential process 180 ° to and realize high signal amplitude and to disturbing insensitive signal.This system figure 1 illustrates.Scanning element 16 includes the detector cells 15 for scanning increment indexing track 14 in this embodiment.Here, detector cells 15 produces the scanning signal of four difference phase shift 90 °.These scanning signals are exaggerated by means of amplifier unit 17 and are then output as position signalling P0, P90, P180 and P270.Position signalling P0, P90, P180 and P270 are referred to as 0 ° of position signalling P0,90 ° of position signalling P90,180 ° of position signalling P180 and 270 ° of position signalling P270 accordingly with its phase place.

The physical principle that scanning is based on is the most inessential.The most such as can relate to optics, magnetic, inductance or the scanning of electric capacity.

Position signalling P0, P90, P180, P270 are fed to signal processing unit 18, this signal processing unit generates count signal from position signalling P0, P90, P180, P270, utilizes these count signals can count relevant with symbol relative to the change of the position signalling caused by the relative motion of scanning element 16 by indexing carrier or increment indexing track 14, i.e. relevant with the direction of motion.Signal processing unit 18 includes only two comparators 19 in this embodiment, carries position signalling P0, P180 or P90 of two phase shifts 180 °, P270 respectively to the two comparator.As the count signal for basic counter unit 20, therefore the output at comparator 19 produces the rectangular signal of two phase shifts 90 °, and described rectangular signal allows the counting relevant with the direction of motion of the signal period to position signalling P0, P90, P180, P270.

It should be pointed out that, that herein signal processing unit 18 may be constructed such that in practice the most more complicated.Especially, described signal processing unit can include the skew for correction position signal P0, P90, P180, P270, amplitude and the amending unit of phase error.

Count signal is forwarded to basic counter unit 20.Output at basic counter unit 20 produces absolute positional value by this way, and the base resolution of this positional value is usually the indexing cycle of increment indexing track 14.

The count signal of two phase shifts 90 ° experiences four combinations of states during an indexing cycle, and these four combinations of states can be assigned to (0 °-90 ° of four quadrants of pure oscillation；90°-180°；180°-270°；270 °-360 °) and therefore it is also regarded as clinometer numerical value.Described clinometer numerical value can be exported as minimum position (LSB) and resolution brought up to 1/4th signal periods the most in this way by basic counter unit 20 together.

The output of basic counter unit 20 is fed to interface unit 22 now, and this interface unit such as connects by means of serial line interface and is connected with servo-actuated electronic system (Folgeelektronik) 100.By this serial line interface, servo-actuated electronic system 100 can ask positional value (meter reading of basic counter unit 20) and other data if desired from position measurement apparatus 10 now.

In addition to being formed and utilizing the Counter Value of positional value that the resolution of whole signal period or 1/4th signal periods illustrates relative coarseness, it is also possible to be provided in position measurement apparatus 10 by position signalling P0, P90, P180, P270 interpolation being provided high-resolution fine location value and flowing to the device (not shown) of interface unit 22 equally.

As already mentioned, in position measurement apparatus 10 based on the analysis to increment indexing track, it is provided for providing the device of the reference point of counting.This can be carried out the most in the following way, is i.e. additional to increment indexing track 14 on indexing carrier 12 and also sets up so-called reference marker, and described reference marker is equally detected by scanning element 16.After reference marker being detected, basic counter unit 20 can be reset or be set to the initial value of definition.This device is sufficiently known by technical staff and is not described in further detail at this.

According to the present invention, the position signalling in position measurement apparatus 10 is fed to monitoring unit 200 further, and this monitoring unit monitors the correctness of position signalling based on combinations of states and the order relevant with position of these combinations of states.Simple examples to these with good grounds two position signallings the most sine-shaped, the phase shift 90 ° each other of these position signallings and relevant with position ground around reference value vibrate, this reference value is at the 50% of the peak-to-peak value of position signalling.If giving the value distribution logic high of more than reference value and distributing logic low to reference value value below, being then that two positional values draw four logical state combination, these combinations of states must the most in succession during scanning element is relative to indexing carrier relative movement.And if one of combinations of states is skipped, then it is believed that scan is malfunctioning.

Position signalling P0, P90, P180, P270 are fed to signal computing unit 210 in monitoring device 200, and this signal computing unit forms status data word from position signalling P0, P90, P180, P270 or position signalling group.The present invention is based on the recognition that, i.e. these status data words predictably change its state, i.e. its digital value during scanning element 16 and increment index the relative motion between track 14.If occur between virtual condition and expectation state when comparing these status data words in analytic unit 220 now is inconsistent, then can identify the malfunctioning of position signalling P0, P90, P180, P270 when considering different position signalling P0, P90, P180, P270 or position signalling group to form status data word.

If the most such as formed respectively from four position signallings P0, P90, P180, P270 each status data word (by and the maxima and minima being in position signalling between the signal of reference value compare as described above), then can determine wrong position signalling by the intersection of status data word is compared.Equally form status data word from the centering of position signalling P0, P90, P180, P270, such as form the first status data word by comparing 0 ° of position signalling P0 and 90 ° of position signalling P90, and form the second status data word by comparing 180 ° of position signalling P180 and 270 ° of position signalling P270.

In particularly advantageous embodiment shown in FIG, considering three in four position signallings P0, P90, P180, P270 respectively to form four status datas word Z1, Z2, Z3, Z4, these status data words are fed to Count of Status unit 230,240,250,260.Owing to position signalling P0, P90, P180, P270 are periodic, so three position signallings selected always have centered position signal, to this position signalling of delayed 90 ° and the position signalling of advanced 90 °.

0 °, 180 ° and 270 ° of position signallings P0, P180, P270 are carried to the first Count of Status unit 230.270 ° of position signalling P270 are centered position signal in this case, and 180 ° of position signalling P180 are delayed position signallings, and 0 ° of position signalling P0 is advanced position signalling.First comparator 231 compares 0 ° of position signalling P0 and 270 ° of position signalling P270, and the second comparator 232 compares 180 ° of position signalling P180 and 270 ° of position signalling P270.Therefore, the comparable ground with the outfan of the comparator 19 of signal processing unit 18, output at comparator 231,232 produces the count signal of two phase shifts 90 ° each other, and described count signal is fed to enumerator 233 with symbol or relevant the signal period to position signalling P0, P180, P270 of being used counts with the direction of motion.

With the first Count of Status unit 230 similarly, in the second Count of Status unit 240, first comparator 241 compares (placed in the middle) 0 ° of position signalling P0 and (delayed) 270 ° of position signalling P270, second comparator 232 compares (placed in the middle) 0 ° of position signalling P0 and (advanced) 90 ° of position signalling P270, and the signal period is counted by enumerator 243.

In third state counting unit 250, first comparator 251 compares (placed in the middle) 90 ° of position signalling P90 and (advanced) 180 ° of position signalling P180, second comparator 252 compares (placed in the middle) 90 ° of position signalling P90 and (delayed) 0 ° of position signalling P0, and the signal period is counted by enumerator 253.

Last in the 4th Count of Status unit 260, first comparator 162 compares (delayed) 90 ° of position signalling P90 and (placed in the middle) 180 ° of position signalling P180, second comparator 252 compares (advanced) 270 ° of position signalling P270 and (placed in the middle) 180 ° of position signalling P180, and enumerator 263 is arranged for counting the signal period.

In a word, a holding in position signalling P0, P90, P180, P270 is just had not to be considered in each Count of Status unit 230,240,250,260.Therefore the inefficacy of a position signalling causes, and three enumerators have deviation (such as stopping (stehenbleiben)) with expected value, and do not consider that this enumerator of this position signalling continues to provide desired value.

The introducing of enumerator 233,243,253,263 has particular advantage, and the change in location in the most current state change, i.e. the indexing cycle is detected, and the process relevant with position of state change is also detected.Especially when changing relative to the fastest state caused by the high moving speed of increment indexing track 14 due to scanning element 16, can determine the margin of tolerance to determine the disarmed state in analytic unit 220 now, in this margin of tolerance, the Counter Value of Count of Status unit 230,240,250,260 has allowed deviation each other.

Each Count of Status unit 230,240,250,260 in Fig. 1 all includes two comparators 231,232,241,242,251,252,261,262.But it is because comparator 231 and 241,232 and 262,242 and 252,251 and 261 process identical position signalling respectively, therefore, when the output remaining comparator is fed to two enumerators respectively, the number of the comparator in signal computing unit 210 can halve.Therefore the first enumerator 233 in the output of comparator 231 not only flows to the first Count of Status unit 230, and when also flowing to the second enumerator 243 in the second Count of Status unit 240, such as, can save comparator 241.Comparator 231 can both be assigned to the first Count of Status unit 230 in this case, is also allocated to the second Count of Status unit 240.

The output of enumerator 233,243,253,263 forms status data word Z1, Z2, Z3, Z4.The bits number of status data word Z1, Z2, Z3, Z4 can correspond to the bits number of basic counter unit 20 and therefore includes total measurement scope of position measurement apparatus at this.This has particular advantage, the most in this case, may be provided for the Counter Value of redundancy and can be exported together by interface unit 22 if desired in addition to the Counter Value of basic counter unit 20.But the most in most cases it is sufficient that, several, such as three positions are only set and enumerator is configured to described cycle counter, this cycle counter starts after reaching the highest meter reading again at zero, or jumps to maximum when less than lowest count device reading.The least status data word Z1, Z2, Z3, Z4 include only 1.Can be the Counter Value digital output signal that supplements comparator 231,232, because these digital output signals are clinometer numerical value as have been described above.Enumerator 233,243,253,263 can be abandoned in the enforcement simplified, and only clinometer numerical value is transmitted to analytic unit 220 as status data word Z1, Z2, Z3, Z4.

Analytic unit 220 compares status data word Z1, Z2, Z3, Z4 and generates error signal F when there is disarmed state.This error signal F such as can be fed to interface unit 22 and be transmitted to servo-actuated electronic system 100 from this interface unit 22.On the one hand disarmed state can exceed allowed tolerance and outward expansion by being compared to each other status data word Z1, Z2, Z3, Z4(Counter Value) identify, on the other hand can be changed (Counter Value allows the most only to change a counting step) by the value checking status data word Z1, Z2, Z3, Z4 in terms of reasonability and identify.

When really define the Counter Value of basic counter unit 20 of real position measurements by completely or partially (the lower value position of such as some) flow to analytic unit 220 and described Counter Value compared with status data word Z1, Z2, Z3, Z4 equally time, the present invention can be improved further.In this way, not only monitoring position signalling P0, P90, P180, P270, and by comparing also monitoring position signalling P0, P90, P180, P270 by signal processing unit 18 and the signal path of basic counter unit 20 with intersecting of the Counter Value of basic counter unit 20.

Fig. 2 illustrates the block diagram of the second embodiment of the position measurement apparatus with monitoring unit 200 of the present invention.Different from embodiment above, this position measurement apparatus does not produce the digital position values of the Counter Value form as output signal, but analog position signal P0, P90, P180, P270 is exported enlargedly by means of differential amplifier 30,31 and be used for processing further to servo-actuated electronic system 100.

In order to still realize comparing for intersecting between the signal path producing status data word Z1, Z2, Z3, Z4 with the output signal of differential amplifier 30,31, with the comparator 19 in the embodiment of Fig. 1 and basic counter unit 20, monitoring unit 200 the most additionally includes that two comparators 270 and an auxiliary counter unit 271 are in order to produce digital count value.Because there is no need to detect total measurement scope of position measurement apparatus at this, auxiliary counter unit 271 can be restricted to a small amount of position.Here can also consider to compare with status data word Z1, Z2, Z3, the Z4 in analytic unit 220 as clinometer numerical value using the output signal of comparator 270.

Differential amplifier 30,31 is only again the strong modification simplified of signal processing.In practice, the most more complicated circuit can replace differential amplifier 30,31, this the most more complicated circuit also carries out the further process to position signalling P0, P90, P180, P270 in addition to pure enlarging function, such as to skew and/or phase error is modified or the frequency multiplication that synthesizes output signal relative to position signalling P0, P90, P180, P270.

Alternatively, differential amplifier 30,31 can replace analog output signal and also forms clinometer numerical value and export to servo-actuated electronic system 100 for analyzing further directly as so-called orthogonal signalling (Quadratursignale).

Because being not provided with the interface unit for transmitting digital information in this embodiment, it is possible to error signal F is exported to servo-actuated electronic system 100 by single circuit.It is undesirable that there is single circuit, then can also carry out the signalisation of error indirectly by output signal circuit.The most in the embodiment of fig. 2, the output signal of differential amplifier 30,31 is guided by switch element 32,33.The appearance of error signal F causes opening and therefore this error condition being signaled to servo-actuated electronic system 100 of switch element 32,33 now.Alternatively, short circuit can also be caused between the output signal of differential amplifier 30,31 to signal this error condition.

Figure 3 illustrates the block diagram of the 3rd embodiment of monitoring unit 200 of the present invention.The parts described in combination with previous embodiment have identical reference as in fig 1 and 2.

Here with previous embodiment be clearly distinguished from be, analytic unit 220 is divided into the first analytic unit 220.1 and the second analytic unit 220.2 in this example, and wherein the first analytic unit 220.1 is positioned in position measurement apparatus 10 and the second analytic unit 220.2 is positioned in servo-actuated electronic system 100.Therefore, monitoring unit 200 extends in position measurement apparatus 10 and servo-actuated electronic system 100 in this embodiment.

Carry the first status data word Z1 and third state data word Z3 to the first analytic unit 220.1 now.As already indicated above, consider 0 ° of position signalling P0,180 ° of position signalling P180 and 270 ° of position signalling P270 to produce the first status data word Z1, but do not consider 90 ° of position signallings.And in order to produce third state data word Z3,270 ° of position signalling P270 keep being not used, instead use 90 ° of position signalling P90.If two status data word Z1 and Z3 have deviation each other, then can be inferred that one of two position signalling P90 or P270 lost efficacy.In this case, the first analytic unit 220.1 exports the first error signal F1 to interface unit 22.

The second status data word Z2 and the 4th status data word Z4 is analyzed in the second analytic unit 220.2.Described second status data word Z2 and the 4th status data word Z4 is fed to interface unit 22 and can be transferred to the interface unit 110 servo-actuated electronic system 100 from this interface unit 22 for this, and these status data words are transmitted to the second analytic unit 220.2 and are used for analyzing by this interface unit 110.Owing to not using 180 ° of position signallings produce the second status data word Z2 and do not use 0 ° of position signalling P0 to produce the 4th status data word Z4, can infer two position signalling P0, the error of 180 by the deviation of two status datas word Z2, Z4 again, this error is signaled by the second error signal F2.

First error signal F1 and error signal F in first embodiment similarly as flow to interface unit 22 and servo-actuated electronic system 100 can be transferred to.This first error signal F1 or can be analyzed there individually, the second analytic unit 220.2 is flowed to as show in figure 3, this first error signal F1 is included to form the second error signal F2 by this second analytic unit 220.2, thus the second error signal F2 forms total error signal, this total error signal typically signals inefficacy or the error of position signalling one of P0, P90, P180, P270.

The second analytic unit 220.2 in the first analytic unit 220.1 being divided in position measurement apparatus 10 by analytic unit 220 that figure 3 illustrates and servo-actuated electronic system 100 is very favorable the most in the case where there: in order to produce status data word Z2, the Z4 being transferred to servo-actuated electronic system 100, use Count of Status unit 240,260, the count range of described Count of Status unit includes the measurement scope of position measurement apparatus 10, namely the indexing striped to be counted on indexing carrier, extends if desired with clinometer numerical value.Basic counter unit 20 can be abandoned in this case, because status data word Z2, Z4 have been complete positional values.In addition, by transmitting two status datas word Z2, Z4 redundantly and in servo-actuated electronic system 100, it being analyzed, can disclose the error in transmitting via the data of data transmission route section, this data transmission route section is formed by the interface unit 22 in position measurement apparatus 10, interface unit 110 in servo-actuated electronic system 100 and the data transmission link arranged therebetween.

And arrange there is subtotal figure scope such as 8 or less Count of Status unit 230,250 is sufficient to produce status data word Z1 and Z3 analyzed in position measurement apparatus 10.

Additionally, the position measurement apparatus 10 in Fig. 3 includes interpolater 300, this interpolater produces fine location value from the range value of position signalling P0, P90, P180, P270, and this fine location value illustrates the position between two the indexing stripeds indexing on carrier 12.This can as well known to technical staff by analog/digital conversion and then applied mathematics algorithm (such as CORDIC) carry out.By supplementing positional value (status data word Z2, Z4) with fine location value, the resolution of position measurement apparatus 10 can be significantly improved.In order to improve error disclose probability, it is advantageous in position measurement apparatus 10 the most to status data word Z2, Z4 supplement with fine location value and be included into the second analytic unit 220.2 analysis in.

Certainly, these embodiments only illustrate the modification of monitoring unit.Measure according to the present invention can also use in other position analysis equipment in the way of suitably passing through conversion.Monitoring unit according to the present invention is particularly well-suited for being integrated in highly integrated special module (ASIC).Advantageously, the monitoring unit of scanning element, position analysis device, interface unit and the present invention is integrated in unique ASIC.

If a part for analytic unit 220 is arranged in servo-actuated electronic system 100 as illustrate by the second analytic unit 220.2 in the third embodiment, then this part such as may be embodied as ASIC or FPGA(field programmable gate array).Because servo-actuated electronic system 100 is typically computer, and the second analytic unit 220.2 can also be embodied as computer program.

Claims (16)

1. the monitoring unit (200) being used for monitoring the position signalling (P0, P90, P180, P270) that incremental counter measures equipment, wherein apply at least two position signalling (P0, P90, P180, P270) at input side, these position signallings from by means of scanning element (16) to increment indexing track (14) scanning obtain and have each other phase shift, described monitoring unit has

Signal computing unit (210), utilizes this signal computing unit can generate the status data word (Z1, Z2, Z3, Z4) that at least two is relevant with position from different position signallings (P0, P90, P180, P270), and

Analytic unit (220), described status data word (Z1, Z2, Z3, Z4) this analytic unit it is fed to, by comparing status data word (Z1 in this analytic unit, Z2, Z3, Z4) can determine that disarmed state and determined by can generate error signal (F in the case of disarmed state, F1, F2), at least two Count of Status unit (230 is wherein set in described signal computing unit (210), 240, 250, 260), utilize these Count of Status unit can be to position signalling (P0, P90, P180, P270) State Transferring carries out counting and using count value as status data word (Z1, Z2, Z3, Z4) described analytic unit (220) is flowed to.

Monitoring unit the most according to claim 1 (220), wherein

Described position signalling (P0, P90, P180, P270) includes 0 ° of position signalling (P0), 90 ° of position signallings (P90), 180 ° of position signallings (P180) and 270 ° of position signallings (P270), these position signallings have the phase shift of 90 ° separately from each other and carry three position signallings (P0, P90, P180, P270) to each Count of Status unit (230,240,250,260)

Each Count of Status unit (230,240,250,260) includes two comparators (231,232,241,242,251,252,261,262), utilizes these comparators can generate the clinometer numerical value of phase shift the most each other 90 ° from the position signalling of the difference two of three position signallings (P0, P90, P180, P270) phase shift 90 ° each other.

Monitoring unit the most according to claim 2 (200), wherein said clinometer numerical value is flowed to described analytic unit (220) as status data word (Z1, Z2, Z3, Z4).

Monitoring unit the most according to claim 2 (200), the most each Count of Status unit (230,240,250,260) all includes enumerator (233,243,253,263), carry described clinometer numerical value to described enumerator and described enumerator is suitable to count the signal period of described position signalling (P0, P90, P180, P270), and the count value of described enumerator (233,243,253,263) is flowed to described analytic unit (220) as status data word (Z1, Z2, Z3, Z4).

5. according to the monitoring unit (200) one of Claims 1-4 Suo Shu, wherein to described monitoring unit (200) conveying incremental counter measure equipment output signal and in described analytic unit (220) relatively time consider these output signals in the lump.

6. according to the monitoring unit (200) one of Claims 1-4 Suo Shu, wherein

Four status data words (Z1, Z2, Z3, Z4) can be generated in described signal computing unit (210),

Described analytic unit (220) includes the first analytic unit (220.1) and the second analytic unit (220.2), and described first analytic unit (220.1) is arranged in incremental counter and measures in equipment (10), it is arranged in servo-actuated electronic system (100) with described second analytic unit (220.2)

Two in described four status data words (Z1, Z2, Z3, Z4) are carried respectively to described first analytic unit (220.1) and described second analytic unit (220.2), and

In described first analytic unit (220.1) determined by can generate in the case of disarmed state the first error signal (F1) and in described second analytic unit (220.2) determined by can generate the second error signal (F2) in the case of disarmed state.

Monitoring unit the most according to claim 6 (200), two the status data words (Z2, Z4) wherein compared in described second analytic unit (220.2) can flow to described second analytic unit (220.2) by the interface unit (110) of interface unit (22) and servo-actuated electronic system (100) that incremental counter measures equipment (10).

Monitoring unit the most according to claim 6 (200), the status data word (Z2, Z4) wherein flowing to described second analytic unit (220.2) is count value, and the count range of described count value includes that incremental counter measures the measurement scope of equipment (10).

9. one kind is used for monitoring, by means of monitoring unit (200), the method that incremental counter measures the position signalling (P0, P90, P180, P270) of equipment, input lateral described monitoring unit conveying at least two position signalling (P0, P90, P180, P270), these position signallings obtain and have each other phase shift from by means of the scanning element (16) scanning to increment indexing track (14), and described method has the following step:

Generate, from different position signallings (P0, P90, P180, P270), the status data word (Z1, Z2, Z3, Z4) that at least two is relevant with position in signal computing unit (210),

By comparing the disarmed state determining described status data word (Z1, Z2, Z3, Z4) in analytic unit (220), and

In analytic unit (220) determined by generate error signal (F, F1, F2) in the case of disarmed state, wherein arranging at least two Count of Status unit (230,240,250,260) in described signal computing unit (210), the State Transferring of position signalling (P0, P90, P180, P270) is counted and count value is exported to described analytic unit (220) as status data word (Z1, Z2, Z3, Z4) by described Count of Status unit.

Method the most according to claim 9, wherein

Described position signalling (P0, P90, P180, P270) includes 0 ° of position signalling (P0), 90 ° of position signallings (P90), 180 ° of position signallings (P180) and 270 ° of position signallings (P270), these position signallings have the phase shift of 90 ° separately from each other and carry three position signallings (P0, P90, P180, P270) to each Count of Status unit (230,240,250,260)

Each Count of Status unit (230,240,250,260) includes two comparators (231,232,241,242,251,252,261,262), and these comparators generate the clinometer numerical value of phase shift the most each other 90 ° from the position signalling of the difference two of three position signallings (P0, P90, P180, P270) phase shift 90 ° each other.

11. methods according to claim 10, described clinometer numerical value is flowed to described analytic unit (220) as status data word (Z1, Z2, Z3, Z4) by wherein said comparator (231,232,241,242,251,252,261,262).

12. methods according to claim 10, the most each Count of Status unit (230,240,250,260) all includes enumerator (233,243,253,263), carry described clinometer numerical value to described enumerator and the signal period of described position signalling (P0, P90, P180, P270) is counted by described enumerator, and the count value of described enumerator (233,243,253,263) is flowed to described analytic unit (220) as status data word (Z1, Z2, Z3, Z4).

13. according to the method one of claim 9 to 12 Suo Shu, wherein measure the output signal of equipment to described monitoring unit (200) conveying incremental counter and in described analytic unit (220) relatively time consider these output signals in the lump.

14. according to the method one of claim 9 to 12 Suo Shu, wherein

Four status data words (Z1, Z2, Z3, Z4) are generated in described signal computing unit (210),

Described analytic unit (220) includes the first analytic unit (220.1) and the second analytic unit (220.2), and described first analytic unit (220.1) is arranged in incremental counter and measures in equipment (10), it is arranged in servo-actuated electronic system (100) with described second analytic unit (220.2)

Two in described four status data words (Z1, Z2, Z3, Z4) are carried respectively to described first analytic unit (220.1) and described second analytic unit (220.2), and

In described first analytic unit (220.1) determined by generate in the case of disarmed state the first error signal (F1) and in described second analytic unit (220.2) determined by generate the second error signal (F2) in the case of disarmed state.

15. method according to claim 14, two the status data words (Z2, Z4) wherein compared in described second analytic unit (220.2) are fed to described second analytic unit (220.2) by the interface unit (110) of interface unit (22) and servo-actuated electronic system (100) that incremental counter measures equipment (10).

16. methods according to claim 14, the status data word (Z2, Z4) wherein flowing to described second analytic unit (220.2) is count value, and the count range of described count value includes that incremental counter measures the measurement scope of equipment (10).