Master Value Coupling - Siemens SIMATIC S7-1500 Function Manual

Basics
3.19 Synchronous operation
Homing with active synchronous operation
A position offset at the following axis is not compensated with relative gearing. This means a
new offset results when homing the following axis during an active synchronous operation. A
job for active homing at a following axis overrides synchronous operation.
NOTICE
Drive damage
The position of the leading axis can change suddenly during homing of the leading axis.
This master value jump has the effect of a setpoint jump at the following axis. The setpoint
jump is traversed at the following axis taking the gear ratio into consideration. Jerky
compensation motions at the following axis and drive damage could result.
If homing of the leading axis is required during active synchronous operation, keep the
master value jump and its effects on the following axis to a minimum.
3.19.3

Master value coupling

The master value for synchronous operation is provided by a leading axis. The master
values are always the position setpoints of the leading axis (setpoint coupling). A following
axis can be coupled with different master values. Only one master value is actively evaluated
at any one time. The master value can be specified by positioning axes or synchronous
axes.
The master value is specified in the user program with the call of the Motion Control
instruction "MC_GearIn". The master value is switched when you call the "MC_GearIn" again
specifying a different leading axis.
The figure below shows an example of a synchronous axis with several master values:
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S7-1500 Motion Control V13 Update 3
Function Manual, 07/2014, A5E03879256-AC