JPH06137894A - Method for sending abnormality of pulse encoder - Google Patents

Abstract

PURPOSE:To enlarge the feeding data quantity, and reverse a third pulse again without providing a special circuit by prolonging the width of the third pulse by a predetermined times of the width of a first and a second pulse in response to the data showing the generation of abnormality, and sending it. CONSTITUTION:When the C phase is inputted to an abnormality sending circuit incorporated in an encoder, error codes D0-D3 are set in a counter 2, and when the C phase becomes (L), counting is started. In the case where the error data showing the generation of abnormality and temperature abnormality, which is set in the codes D0-D3, is FH, pulse width of the output C' phase is as same as that of the C phase, and the end of the pulse width is the point F. In this case where the error data is EH, the output Q is maintained at (H) till one pulse of the pulse, which is quadruple-differentiated by a quadruple- differentiating circuit 1, is outputted, and the rear end of the pulse width of the C' phase is prolonged to the point E and prolonged by 1/2 pulse of the A phase and the B phase. Similarly, in the case of DH, CH, BH, pulse width of the C' phase is prolonged more to obtain a large sending data quantity. Since the C' phase is returned to the original point, re-inversion is not required.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an encoder for generating incremental pulses, and in particular, first and second pulses having the same pulse width and having a phase difference of 90.degree. The present invention relates to an abnormality sending method in a pulse encoder that outputs a third pulse that is pulse-generated.

[0002]

2. Description of the Related Art Conventionally, as a method of abnormally transmitting an encoder of this type, Japanese Patent Application No. 60-234194 (Japanese Patent Application Laid-Open No. 62-9).
3618), in which a method of sending an abnormality by inverting the C-phase pulse is adopted.

[0003]

In the above-mentioned conventional abnormal transmission method of the pulse encoder, the amount of data that can be transmitted is limited to 1 bit, the amount of data is too small, and C
Since the rising and falling edges of the phase are reversed and the phase may be shifted, a circuit that inverts again to restore the phase and sends it to the subsequent stage is necessary to achieve the purpose of origin return. There is a drawback that An object of the present invention is to provide a method for abnormally sending a pulse encoder, which does not require a circuit for increasing the amount of data to be sent and for inverting the inverted C-phase pulse again.

[0004]

According to the abnormality transmitting method of the pulse encoder of the present invention, the width of the third pulse output corresponds to the data indicating the abnormality generated in the pulse encoder, and the width of the third pulse output is set to a predetermined multiple. It is extended by the pulse width of 2 and transmitted.

[0005]

Since the signal width of the third pulse output is extended by a predetermined multiple of the first and second pulse widths corresponding to the data indicating the abnormality, and then transmitted, the amount of data to be transmitted can be increased. , The third pulse is not inverted, so there is no need to invert it again to restore the original waveform.

[0006]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a time chart of a pulse waveform in an embodiment of an abnormal transmission method of a pulse encoder of the present invention, FIG. 2 is a circuit diagram of an abnormal transmission circuit used in the abnormal transmission method of the pulse encoder of FIG. 1, and FIG. 2 is a circuit diagram of an abnormality receiving circuit that receives a transmission signal from the abnormality transmitting circuit of FIG. The pulse encoder of FIG. 1 outputs an A-phase pulse having a pulse width of 2 pulses and a B-phase pulse having the same 2-pulse width as the A-phase pulse and having a phase difference of 90 ° from that of the A-phase pulse. The C-phase pulse having the same two-pulse width as the B-phase and B-phase pulses is output for each rotation of the rotating shaft,
It is used for home return.

With this abnormal transmission method of the pulse encoder
Is a C-phase pulse when an abnormality occurs in the pulse encoder.
The pulse width after the output rises is shown by the dotted line in Fig. 1.
Then, the pulse widths of the A and B phases that are a predetermined multiple are extended and transmitted.
The device used for the abnormal transmission method of this encoder is
The abnormality sending circuit shown in 2, which is an encoder
Is added to and incorporated into. This abnormality sending circuit is 4 times differential
Road 1 and counter 2 are the main components.
C-phase pulse corresponding to the set error code
The width is extended and output as a C'phase pulse.
ing. The quadrupling differential circuit 1 is a well-known circuit and has a phase A
Ruth and B-phase pulse are input. Counter 2 is counter I
It consists of C193, and is a 4-bit negative logic error code.
D₀ D₁ D₂ D₃ If so, the C phase pulse is input.
Code D₀ , D₁ , D₂ , D₃ Is set on counter 2
Is set and the C-phase pulse becomes “L”, the counter 2
Start. Code D ₀ , D₁ , D₂ , D₃ Set to
The error data indicating the occurrence of abnormalities or abnormalities such as temperature is F
_H If so, the output Q is originally "L" and the output C '
The width of the phase pulse is the same as the original C phase pulse,
It becomes the pulse width with the point at the rear end. Error data is E_H so
If set, the 4th derivative circuit 1 differentiates the 4th derivative.
Output Q becomes "H" until one pulse arrives and the C'phase
The pulse width of the A phase and B phase so that the rear end comes to point E in Fig. 1.
It becomes half the pulse width, that is, one pulse longer. same
Similarly, the error data is D_H If set in, the C'phase
The pulse lengthens by one pulse and the rear end is point D in Fig. 1.
The error data is C_H , B_H And
Then, the C'phase pulse is further extended by one pulse each.
Is output as a pulse width with the rear end at points C and B.
It

Next, the error is sent from the abnormal sending circuit of FIG.
An abnormal reception circuit that receives a signal will be described. This difference
As shown in FIG. 3, the normal reception circuit is a quadruple differentiation circuit 3 and a cow.
The main components are the computer 4 and the DFF 5, and the NC machine
Installed on the controller side. The quadrature differentiation circuit 3 has an A phase
Ruth and B-phase pulse are input. Counter 4 is IC193
And E in advance_H Is set. here,
E for counter 4_H Is set when the C-phase pulse width is
This is because the pulse width is originally the same as that of the A phase and B phase.
Further, the counter 4 has a NAND on the output side of the quadruple differentiation circuit 3.
The output of circuit 6 and the C'phase pulse are input, and the C'phase pulse
Starts counting when "H" becomes, and the C'phase pulse
When it becomes “L”, the output data of the counter 4 is discrete.
It is latched by the DFF5 composed of the IC 574. here,
The counter 4 counts the width of the input C'phase pulse.
But E in advance_H Is set, the original C phase
"2", which is the width of the lure, has been reduced and it has been extended by the abnormality sending circuit.
Detected pulse width is detected and corresponds to the detected extended width
Code D indicating abnormal data₀', D₁', D₂', D₃'The cow
The data is latched by the DFF 5 as input data. To DFF5
Latched data D₀', D₁', D₂', D₃'Is a pulse
Error code D set on the encoder side₀ , D₁ , D₂ ，
D ₃ Since it is the inverted data of, the error code is
And whether there is an abnormality or whether the temperature is abnormal.
You can always know the data. In this case, the C-phase pulse is
Since the rising edge of the pulse is used when homing,
It does not matter if the C'phase pulse that comes back is used as it is.

In the abnormal transmission method of the pulse encoder of the present embodiment, since the abnormal data is transmitted by extending the pulse width of the C-phase pulse, the abnormal data amount is not limited to 1 bit and can be large. Since there is no inversion, it is not necessary to invert the inverted pulse again for use in returning to origin.

[0010]

As described above, according to the present invention, when an abnormality occurs in the pulse encoder, the pulse width of the third pulse is extended and transmitted, so that the amount of abnormal data is reduced to 1.
Since it can be made larger than a bit and the 3rd pulse does not need to be inverted, it is not necessary to invert the pulse again to prevent phase shift for use when returning to origin, and there is a large amount of abnormal information. Nevertheless, the circuit is not complicated.

[Brief description of drawings]

FIG. 1 is a time chart of a pulse waveform in an embodiment of a method for abnormally sending a pulse encoder according to the present invention.

FIG. 2 is a circuit diagram of an abnormality sending circuit used in the abnormal sending method of the pulse encoder in FIG.

FIG. 3 is a circuit diagram of an abnormality receiving circuit that receives a transmission signal of the abnormality transmitting circuit of FIG.

[Explanation of symbols]

1, 3 4 times differentiating circuit 2, 4 counter 5 DFF 6 NOR circuit B, C, D, E, F point D ₀ , D ₁ , D ₂ , D ₃ error code D ₀ ', D ₁ ', D ₂ ' , D ₃ 'Inverted code Q output

Claims (1)

[Claims] 1. Pulses having the same pulse width and phases of 90 relative to each other.
In a pulse encoder that outputs a first pulse and a second pulse that are deviated from each other and a third pulse that generates one pulse for each rotation of the rotary shaft, in correspondence with data indicating an abnormality that has occurred in the pulse encoder. , A method of abnormally transmitting a pulse encoder in which the width of the third pulse output is extended by a predetermined multiple of the first and second pulse widths and transmitted.