DE2357104C2 - Circuit arrangement for monitoring the target position of an actuator - Google Patents

Description

) &} _{actually to be} retained or again without command

b) the exits (12 or 22) for the rope, _{fa Hj rf d} - i _{d Rückme} esignale state signals _S (SS ^ £ bzw.55 associated _{VQN SJ, DJE "uo} f _dnet inputs (11 resp. . 21) of the Sollzustandsspei- _f isizustandssignale for comparison with more (10 or 20) of gates (15 and _the stored control commands are used. the 25) for conjunctive logic of loading _STEU £ J _[g recognizes the position of a actuator as taken control command (SBA or SBE) ι with _FEH i _erfre f _a n. _{when the 2u} f _etwork t given control command to the associated Istzustandss.gnal (ISA or _mU matches _{the Istzuslandssignal.} other- im) driven _{fa "s SUC eme end} i _agen error message to a

c) the outputs 14 or 24) for the ⁵ monitoring circuit.

verses Solstatusss, gnae (55Z or SSE) actuators, however, require a certain run-related inputs (13 or 23) of the rope. _{to yon} . ^ J _{jn dne} ^ _{n End} ,
state memory (10 or 20) are of genus _{m ge] n After Vcrlass} ^b _{s of the previously} ig _e tern n end position (16 or 26) to _be conjunctive VCR _| > _{Det the actuator ncuen} end position ^b _until reaching the knupfung the associated inverse Istr.u- in a non-controlled state intermediate signal (TJT or TSE] ι with the decision, _the ^ _{f. Ka def size Nordn}
Opposite control command (SBE or SBA) _M t _{lliseconds for} contactor and solenoid valves up to ^ t ⁶ "^ G Mi ii

,. ,. ^ t- ⁶ ", ^ ',,,,. , Tr * i. on the order of minutes with electromotive

^{} D} 'e ^E ndlagenfehlerme fertilize (EFA or _{Angeli. Ie} surrounded valves and slide valves rich. Currencies

^{ru} fu} _r ^{r, f} _B ^{a 'Sche} are plagued formed in _{this term} ^b _{d erfo, kdn evaluable Is.}

Gauern (18 or 28) _{status signal} to konjunkt.ven VSR. _A simple comparison of the last one

^ k " ⁸ ^? ^VtTSe ? ^Sollzv f. andss' S ™ ^en given control command with the actual ^{status signals}

S ?,? Y / Γ, ί h ™ g ^{hon & en Is:} ' ^U - would a final

Level signals (ISA or ISE), position status messages result when the actuator has a

^e) il- # Si ¹ w » ^8enf 1 ^hlermel c ^U » ^{Sen iEF} 1 ^N u? 7- has reached the wrong end position. Such a delayed one

EFEN) ι for left end positions are formed _enc " _agenfch i _e ^b _rm eldung is not desired.

or SSE) 'and the associated inverse T ^^^' d ^ M ^ ^ f ^^ MW

Actual status signals (75 * or TSE). «Applications, October 1971 pp. 141, 175, 246

'Is a signaling and output unit for controlling

2. Circuit arrangement according to claim 1, contactors, switches and drives with einkanaligcr characterized in that the gates (15 or 25) control logic known, which a signaling for contains conjunctive linkage of the relevant member, which signals whether the actuating

Control command (SBA or SBE) with the associated member in accordance with the command in the

gen actual status signal (ISA or ISE) is in each case at the end position shown or whether the commanded

one of its inputs with the associated actual end position has not been reached. The signaling ghed

Stand signal (ISA or ISE) and on their two- contains a memory that is controlled by the signal buttons

th input is set OFF or ON with the output signal of the commands entered.

Locking gates (8 or 9) are activated, which 55 The stored command signals are sent with return

On the output side, with the setting commands (SBA or SBE) report signals conjunctively to error signals

and links with the output signal of an OR gate. The error signals are thus also during

(19) are applied, which forms all end positions of the running time of the actuator. To mistake

Error messages (E / vl / V, EFA, EFE, EFEN) dis- signals during the runtime of the actuator

linked together. Suppress 6o, a delay element is provided,

3. Circuit arrangement according to claim I, the output signal of which the AND gates for formation are characterized in that the gates (17, 18 blocks the error signals. Only after expiry of a fixed or 27, 28) for formation of the end position Bridging fertilize (EFAN, EFA or EFEN, FFE) on the switchover time with normal actuation, the output side sends a release signal to the outputs (12, 14 or 21, 65 delay element to the ge-24) of the target / foreign memory (10 and 20) and had AND gates. The delay element is connected to the outputs of OR gates (33 b7: w. Through a conjunctive linkage of a stored 34), the command signal on the input side with a corresponding one

Feedback signal triggered. The well-known signaling element In the event of an error signal, it does not make it possible to distinguish whether the actuator drive is hanging remained or whether the actuator has reached the wrong end position.

The invention is based on the object of providing a circuit arrangement of the type mentioned at the beginning to create, which issues instantaneous qualified end position messages that show which end position was left without a command and whether a wrong end position was reached.

According to the invention, this object is achieved by the combination of the following features:

a) for each solicitation of the actuator there is a solicitation memory intended for the output of target status signals and inverse target status signals,

b) the inputs of the soJlstatussspeichcr assigned to the outputs for the desired status signals are of gates for conjunctive linking of the relevant control command with the associated one Actual status signal activated,

c) the inputs of the desired state memory assigned to the outputs for the inverse desired state signals are of gates for conjunctive linking of the associated inverse actual state signal controlled with the opposite positioning command,

d) the end position error messages for incorrect end positions are formed in gates to the conjunctive Linking inverse target state signals with the associated actual state signals,

e) the end position error messages for left end positions are formed in gates to the conjunctive Linking of target state signals and the associated inverse actual state signals.

The advantage of the circuit arrangement according to the invention is that it immediately has a qualified end position error message generated.

The invention is explained in more detail in the drawing:

Control 1 issues the control command SBA (control command OFF) at output 2 and the control command SBE (control command ON) at output 3. These control commands act on the control module 4, which applies voltage to the contactor 5 as an actuator or switches it off. The drawn position of the signal contacts 5 e and 5 "of the contactor meet its end position OFF. A binary signal constantly generated by the signal generator 6 is routed via the closed signal contact Sa as the actual state signal ISA for the end position OFF, or via the signal contact 5c as the actual state signal ISE for the end position ON.

The Endlagenfehlerübcrwachung contains the end position from the desired state memory 10 and for end position A of the target state memory 20. The target state memory 10 outputs at its output 12 the target state signal SSA for the nominal OFF state and at its output 14, the inverse to this target state signal 5ΧΪ, while the target state memory 20 at its output 22 the setpoint state signal SSE for the setpoint state ON and at its output 24 the setpoint state signal SSE which is inverse to this. The input 11 assigned to the output 12 of the target state memory 10 is controlled by an AND gate 15 which conjunctively links the actual state signal ISA with the control command SBA. In an analogous manner, the input 21 assigned to the output 22 of the target status memory 20 is controlled by the AND gate 25 for conjunctive linking of the actual status signal ISE with the control command SBE. The input 13 assigned to the output 14 of the target state memory 10 is controlled by an AND gate 16 which forms the conjunctive link of the associated inverse state signal TS ~ Ä ίο with the opposite control command SBE . The input 23 of the target state memory 20 is accordingly preceded by the AND gate 26 for conjunctive linking of the associated inverse state signal ISE with the opposite control command SBA .

The qualified end position error messages EFAN and EFA are generated in gates 17 and 18. The end position error message EFA N means that the actuator has left the end position OFF without a corresponding positioning command. This end position error message EFAN is formed by conjunctive linking of the setpoint status signal SSA with the inverse actual status signal JSTi. The end position error message EFA obtained by conjunctively linking the inverse nominal state signal SSA with the actual state signal ISA means that the actuator has reached the wrong end position OFF without a corresponding setting error. In an analogous way, the end position error message EFEN, which is formed by the conjunctive combination of the desired state signal SSE with the inverse actual state signal TEE , means that the actuator has left the end position ON without a corresponding control command. The end position error message EFE obtained by the conjunctive combination of the inverse nominal state signal S5E and the actual state signal ISE in gate 28 indicates that the actuator has reached the wrong end position ON without a corresponding control command.

At the time the command is issued by an actuating command SBA or SBE , the two target state memories 10 and 20 match the respective actual state signals ISA or ISE . If, for example, the command SBE is given for the end position ON, the desired state memory 20 is set to the right-hand side when the actual state signal ISE arrives and then outputs the desired state signal SSE . The setpoint memory 10 is set to the setpoint state signal SSH at the output 14. If no opposite command for the end position OFF is given, the positions of the two target state memories 10 and 20 and the corresponding target state signals are retained. If the actuator leaves the end position ON without a corresponding control command, the end position error message EFEN appears immediately. If the end position OFF is reached, the end position error message EFA also appears. The same process happens in the opposite direction.

As soon as an end position error message appears, further implementation of the target state memory must be prevented by the positioning commands. This is done in that the control commands SBA and SBE are passed through the blocking gates 8, 9, which can be blocked by the output signal of an OR gate 19. The inputs of the OR gate 19 are ^{acted upon by all qualified 6} S th end position error messages. The lock is maintained until the incorrect position of the actuator is acknowledged by a directional pulse at input 7.

If a protection command SA (protection OFF) occurs in the system control at input terminal 31 or SE (protection ON) at input terminal 32, it is desirable that the command from control I be blocked as soon as possible. This is done by simulating an actual status signal for the end position error monitoring, which causes an end position error message and thus a blocking of gates 8 and 9. For this purpose, the inputs for the signals ISA and 75Z are preceded by gates 17, 1 OR gate 33, the input! is acted upon by the corresponding actual status signal ISA and protection command SA. In the same way, the inputs for the signals ISE and 75Ϊ gates 27, 28 are preceded by the OR gate 34 which disjunctively links the actual state signal ISE with the ski SE.

1 sheet of drawings

Claims (1)

1 2 acted upon by an actual state signal (ISA or / 5E) and claims: a protection command (SA or SE) are.
1. Circuit arrangement for monitoring the Target position of an actuator, the qualified 5 End position error messages from binary positioning commands for the actuator and from binary actual status signals from the actuator forms which its each- The invention relates to a circuit arrangement because show the end position taken, g e k e η η - for monitoring the target position of an actuator, Characterizes the qualified end position error messages from binaries through the combination of the fol- lowing io Features: Ren control commands for the actuator and from actual a) for each target state (OFF or ON) of the? ™? fs ^ en of ^the actuator, which its actuator (5) is a target state rather indicate the end position assumed in each case,
ei λ κ tn \ λ ii ι In automatic plant controls, the