Siemens SIMATIC ET 200S Operating Instructions

1PosInc/Analog
4.6 Functions of the 1PosInc/Analog
ET 200S Positioning
166 Operating Instructions, 05/2007, A5E00124871-04
4.6.18 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 1PosInc/Analog detects the preset edge at the D12 digital input, it stores the
associated actual value, displays it as the feedback value and sets the feedback bit
LATCH_DONE=1.
You can then activate the latch function again.
Latch Function and Reference Point Run or Reference Signal
If the 1PosInc/Analog synchronizes at the same edge, it stores the actual value before it
assigns the reference point coordinates.
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 the edge at DI2
(linear axis: 0 to 16 777 215; rotary axis: 0 to end of rotary axis - 1)
Latch Function: Causes of Errors for JOB_ERR
Error Number Meaning What to Do
36 Latch Function: Edge selection unknown

Siemens SIMATIC ET 200S Specifications

General

Brand	Siemens
Model	SIMATIC ET 200S
Category	I/O Systems
Language	English