Changing The Switchover Difference (Job 4) - Siemens simatic et 200s Operating Instructions Manual

7.6.13

Changing the Switchover Difference (JOB 4)

Definition
Changing the switchover difference allows you to adjust the drive control to adapt to any
changes in the load and mechanical conditions.
Supply the control interface with the new switchover difference, and activate JOB 4.
The 1PosU accepts the specified switchover difference.
The switchover difference remains valid until the parameter assignment of the 1PosU is
changed.
Effect on the MODEs
MODE
Search for Reference
Inching
Absolute Positioning
Relative Positioning
Control Signals: Change Switchover Difference
Address
Byte 4
Bytes 5 to 7
Feedback Signals: Change Switchover Difference
Address
Byte 4
See also
CPU/Master Stop and RESET State (Page 367)
ET 200S Positioning
Operating Instructions, 05/2007, A5E00124871-04
What Happens
-
The following responses are possible:
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.
Assignment
Bits 4.7 to 4.4 :
Bit 7 6
0 1
Bit 0: JOB_REQ
Switchover difference
(linear axis: 0 to 16 777 215; rotary axis: 0...16 777 215)
Assignment
Bit 0: JOB_ACK
5 4
JOB 4 = Change the switchover
0 0
difference
1PosUniversal/Digital
7.6 Functions of the 1PosU
351