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

1PosSSI/Analog
6.6 Functions of the 1PosSSI/Analog
6.6.17

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/Analog 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
36
286
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 the edge at DI2
(linear axis: 0 to 16 777 215; rotary axis: 0 to end of rotary axis - 1)
Meaning
Latch Function: Edge selection unknown
5 4
JOB 10 = Latch function
1 0
Operating Instructions, 05/2007, A5E00124871-04
What to Do
ET 200S Positioning