Siemens S7-300 Operating Instructions Manual page 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:
FM 352 electronic cam controller
Operating Instructions, 05/2011, A5E01071724-03
Baud rate Frame run time for 13 bits
0.125 MHz
0.250 MHz
0.500 MHz
1000 MHz
112 µs
56 µs
28 µs
14 µs
Encoders
11.3 Absolute encoder
Frame run time for 25 bits
208 µs
104 µs
52 µs
26 µs
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