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

1PosSSI/Digital
5.6 Functions of the 1PosSSI/Digital
5.6.12

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 1PosSSI/Digital accepts the specified switchover difference.
The switchover difference remains valid until the parameter assignment of the
1PosSSI/Digital is changed.
Effect on the MODEs
MODE
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 233)
222
What Happens
-
The following responses are possible:
Distance to the destination ≤ the switchover difference
•
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
Operating Instructions, 05/2007, A5E00124871-04
ET 200S Positioning