Machine and cam data
9.10 Machine data of the encoder
FM 352 electronic cam controller
90 Operating Instructions, 05/2011, A5E01071724-03
Monitoring
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
1 = wire break
1 = frame error (must always be 1)
1 = missing pulses
Wire break
When its monitoring function is enabled, the FM 352 monitors the A, /A, B, /B, N, and /N signals of an
incremental encoder. The monitoring function detects:
Wire break
Short circuit on individual cables
For incremental encoders without a zero mark, you must alternatively:
– Disable the wire-break monitoring function
– Interconnect the N and /N signals externally (see chapter "Incremental encoders (Page 137)")
Edge spacing of count pu
lses
Encoder supply failure
Frame error
Frame error monitoring for absolute encoders (SSI) cannot be disabled. It monitors the frame:
Start and stop bit errors
Monitoring of the monoflop time of the connected encoder
Missing pulses (incremental encoder)
An incremental encoder must always return the same number of increments between two successive
zero marks. FM 352 checks whether the zero mark of an incremental encoder coincides with the
correct encoder value. Disable missing pulse monitoring at encoders without zero mark. Also disable
wire-break monitoring, or interconnect the zero mark inputs N and /N externally.
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