Siemens SIMATIC ET 200S - Moving the Encoder Range (JOB 2)

1PosSSI/Analog
6.6 Functions of the 1PosSSI/Analog
ET 200S Positioning
276 Operating Instructions, 05/2007, A5E00124871-04
6.6.10 Moving the Encoder Range (JOB 2)
Definition
When the encoder range is moved, the encoder value is adjusted so that the actual value
displayed corresponds to the real actual value. Before this can be done, any active run must
be terminated.
Supply the control interface with the offset, and activate JOB 2.
You calculate the offset as follows:
Offset = displayed actual value - real actual value
If the offset is negative, proceed as follows:
Offset = displayed actual value - real actual value+ (number of rotations * number of
increments)
The 1PosSSI/Analog accepts the preset offset and displays the real actual value coordinates
at the feedback interface.
Effect on the MODEs
MODEs are not affected by JOB 2.
Control Signals: Move Encoder Range
Address Assignment
Bits 4.7 to 4.4 :
7 6 5 4 Bit
0 0 1 0
JOB 2 = Move encoder range
Byte 4
Bit 0: JOB_REQ
Bytes 5 to 7 Offset
(0 to encoder range)
Feedback Signals: Move Encoder Range
Address Assignment
Bytes 1 to 3 Actual value
(0 to encoder range - 1)
Byte 4 Bit 1: JOB_ERR
Bit 0: JOB_ACK