Encoders
11.3 Absolute encoder
FM 352 electronic cam controller
Operating Instructions, 05/2011, A5E01071724-03
143
Reaction times
With absolute encoders, the FM 352 has the following reaction times:
Minimum reaction time = frame run time + cam cycle time + switching time of the connected
switching elements
Maximum reaction time = 2 x frame run time + monoflop time + 2 x cam cycle time +
switching time of the connected switching elements
With programmable absolute encoders:
Maximum reaction time = frame run time + monoflop time + 2 x cam cycle time + switching
time of the connected switching elements +1/max. step sequence rate
Monoflop time
The following limit values apply to the monoflop time:
● Minimum monoflop time: > 15 µs
● Maximum monoflop time: < 64 µs
Encoders with values outside the limits shown here are not permitted.
Frame run time
The frame run times depend on the baud rate:
Baud rate Frame run time for 13 bits Frame run time for 25 bits
0.125 MHz 112 µs 208 µs
0.250 MHz 56 µs 104 µs
0.500 MHz 28 µs 52 µs
1000 MHz 14 µs 26 µs
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