Machine Data and Incremental Dimensions
8-18
FM 351 Positioning Module
C79000-G7076-C351-02
Address Name Type Initial Value Comment
63.0
63.1
63.2
MON_WIRE
MON_FRAME
MON_PULSE
BOOL
BOOL
BOOL
TRUE
TRUE
TRUE
Monitoring functions:
1 = wire break
1 = frame error (must always be 1)
1 = missing pulses
Wire break
When the monitoring is activated, the FM 351 monitors all cables with a 5 V incremental encoder and an
absolute encoder. The monitoring detects:
• Wire break
• Short circuit on the separate lines.
• Edge-to-edge distance of the count pulses (even with 24 V incremental encoders)
When monitoring with a 24 V incremental encoder, you must set a monitoring time MON_TIME > 0.
With 5 V incremental encoders without zero markers, you must either deactivate the wire break
monitoring or wire the signals N and N
externally (see Section 10.1).
Frame error
The module monitors the frame of an absolute encoder (SSI) for the following:
• Start and stop bit errors
Monitoring for frame errors cannot be deactivated with absolute encoders (SSI).
Missing pulses (incremental encoder)
An incremental encoder must always supply the same number of increments between two consecutive
zero markers.
The FM 351 checks whether the zero marker of an incremental encoder occurs at the correct encoder
status.
For encoders without zero markers, you must deactivate error pulse monitoring.
You must also deactivate wire break monitoring or connect the zero marker inputs N and N
externally.
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