Siemens SIMATIC FM 351 Manual page 71

Address Name
80.0 MON_TIME
Based on the monitoring time, the module monitors the following:
The movement of the axis up to the switch-off point.
The monitoring time starts at the beginning of a positioning operation and is restarted at each change
in the actual value in the direction of travel.
The target approach.
The positioning operation must be completed within the monitoring time.
The monitoring time is triggered for the last time when the switch-off difference is reached.
The plausibility of the actual values at the switching points.
Oscillation of the axis at the switching point leads to operating errors.
The value 0 deactivates the monitoring functions.
Actual monitoring time
For the monitoring time you can specify all values from the defined range.
0: The monitoring is deactivated.
1 to 100,000 ms: The FM 351 rounds the specified time up to a multiple of 8 ms (module cycle).
Ideally, you should therefore enter the monitoring time as a multiple of 8 ms.
FM 351 Positioning Module
C79000-G7076-C351-02
Machine Data and Incremental Dimensions
Data Initial Value
Type
DINT L#2000
Description
Monitoring time
0 = No monitoring
1 to 100 000 ms
8-11