1PosSSI/Digital
5.6 Functions of the 1PosSSI/Digital
ET 200S Positioning
Operating Instructions, 05/2007, A5E00124871-04
223
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 Assignment
Bits 4.7 to 4.4 :
7 6 5 4 Bit
1 0 1 0
JOB 10 = Latch function
Byte 4
Bit 0: JOB_REQ
Byte 5 Bit 1: Latch at negative edge at DI2
Bit 0: Latch at positive edge at DI2
Feedback Signals: Latch Function
Address Assignment
Byte 4 Bit 2: LATCH_DONE
Bit 1: JOB_ERR
Bit 0: JOB_ACK
Bytes 5 to 7 Feedback value: Actual value at edge at DI2
(0 to encoder range-1)
Latch Function: Causes of Errors for JOB_ERR
Error Number Meaning What to Do
23 ERR_ENCODER is displayed Check the encoder wiring
36 Latch Function: Edge selection unknown
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