Latch Function (Job 10) - Siemens simatic et 200s Operating Instructions Manual

5.6.13

Latch Function (JOB 10)

Definition
The latch function allows you to store the actual value at an edge at the DI2 digital input. You
can use this function, for example, to detect edges or measure lengths.
Supply the control interface with the desired edge, and activate JOB 10.
If the 1PosSSI/Digital detects the preset edge at the DI2 digital input, it stores the associated
actual value, displays it as a feedback value and sets the feedback bit LATCH_DONE=1.
You can then activate the latch function again.
Effect on the MODEs
MODEs are not affected by JOB 10.
Control Signals: Latch Function
Address
Byte 4
Byte 5
Feedback Signals: Latch Function
Address
Byte 4
Bytes 5 to 7
Latch Function: Causes of Errors for JOB_ERR
Error Number
23
36
ET 200S Positioning
Operating Instructions, 05/2007, A5E00124871-04
Assignment
Bits 4.7 to 4.4 :
Bit 7 6
1 0
Bit 0: JOB_REQ
Bit 1: Latch at negative edge at DI2
Bit 0: Latch at positive edge at DI2
Assignment
Bit 2: LATCH_DONE
Bit 1: JOB_ERR
Bit 0: JOB_ACK
Feedback value: Actual value at edge at DI2
(0 to encoder range-1)
Meaning
ERR_ENCODER is displayed
Latch Function: Edge selection unknown
5.6 Functions of the 1PosSSI/Digital
5 4
JOB 10 = Latch function
1 0
What to Do
Check the encoder wiring
1PosSSI/Digital
223