Siemens SIMATIC ET 200S - Setting the Actual Value (JOB 1)

1PosSSI/Analog
6.6 Functions of the 1PosSSI/Analog
ET 200S Positioning
274 Operating Instructions, 05/2007, A5E00124871-04
6.6.9 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 a different range on the axis and synchronizes the axis.
At the switchover point the 1PosInc/Digital switches from rapid feed to creep feed, and at the
switch-off it terminates the run.
The 1PosSSI/Analog 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 What Happens
Inching -
Absolute Positioning 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
deceleration 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 > switchover difference
The drive is accelerated again up to the voltage for rapid feed.
Relative Positioning The preset distance continues to be traversed.
Control Signals: Setting of Actual Value
Address Assignment
Bits 4.7 to 4.4 :
7 6 5 4 Bit
0 0 0 1
JOB 1 = Set the actual value
Byte 4
Bit 0: JOB_REQ
Bytes 5 to 7 Actual value coordinates
(0 to encoder range - 1)