Encoders; Incremental Encoders - Siemens S7-300 Operating Instructions Manual

Encoders

11.1

Incremental encoders

Connectable incremental encoders
The module supports incremental encoders outputting two pulses with 90° phase shift, and
with or without zero mark signal:
● Encoders with asymmetrical 24 V output signals
● Encoders with symmetrical output signals and 5 V differential interface conforming to
FM 352 electronic cam controller
Operating Instructions, 05/2011, A5E01071724-03
– Limit frequency = 50 kHz
– Cable length max. 100 m
RS422
– Limit frequency = 1 MHz
– with 5 V supply voltage: Cable length max. 32 m
– with 24 V supply voltage: Cable length max. 100 m
Note
If the encoder (5 V) does not output a zero mark signal and wire-break monitoring is
disabled, you must interconnect the zero mark signal inputs N and /N externally so
that the inputs will exhibit different signal levels (for example, N to 5 V, /N to ground).
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