Setting The Actual Value (Job 1) - Siemens simatic et 200s Operating Instructions Manual

1PosUniversal/Digital
7.6 Functions of the 1PosU
7.6.10

Setting the Actual Value (JOB 1)

Definition
Setting an actual value assigns new coordinates to the actual value displayed. This moves
the operating range to another part of the axis.
The axis is synchronized at incremental encoders and non-activated dosing operation.
At the switchover point the 1PosInc/Digital switches from rapid feed to creep feed, and at the
switch-off it terminates the run.
The 1PosU sets the preset actual value coordinates to the actual value displayed in the
feedback interface and sets the feedback bit SYNC = 1.
Effect on the MODEs
MODE
Search for Reference
Inching
Absolute Positioning
Relative Positioning
Control Signals: Setting of Actual Value
Address
Byte 4
Bytes 5 to 7
346
What Happens
At incremental encoders and non-activated dosing operation ensure when
the reference point run is evaluated that the feedback bit SYNC = 1 is set
immediately.
The reference point run still continues to run.
-
The following responses are possible:
Distance to the destination ≤ switch-off difference
•
The switch-off point is reached or overshot; positioning is switched off
immediately, and the run is terminated with POS_DONE = 1. In this
case, the destination is sometimes overshot.
Distance to the destination ≤ the switchover difference
•
The switchover point is reached or overshot; there is an immediate
reduction from rapid feed to creep feed. In this case the distance
covered in creep feed is less than (switchover difference - switch-off
difference).
Distance to the destination > the switchover difference
•
The drive is moved using rapid feed, even if it was switched over to
creep feed beforehand.
The preset distance continues to be traversed.
Assignment
Bits 4.7 to 4.4 :
Bit 7 6
0 0
Bit 0: JOB_REQ
Actual value coordinates
at incremental encoder (linear axis: 0 to 16 777 215; rotary axis: 0 to end of rotary
axis-1), at SSI encoder (0 to encoder range - 1)
5 4
JOB 1 = Set the actual value
0 1
Operating Instructions, 05/2007, A5E00124871-04
ET 200S Positioning