Siemens SIMATIC S7-300 FM 350-1, Manual

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Encoder signals and their evaluation
8.1 Encoders which can be connected
FM 350-1 Counter module
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Manual, 05/2011, A5E03648639-01
8.1 Encoders which can be connected
Introduction
The counter module can process rectangular count signals which were generated by
incremental encoders or pulse generators.
Incremental encoders scan a barcode to generate rectangular electrical pulses. They differ in
terms of pulse amplitude and number of signals.
Pulse generators such as light barriers or proximity switches (BEROs) return only a
rectangular signal at a specific amplitude.
Connecting different encoders
The counter module supports different encoders which return pulses for the count signals.
The table shows these encoders and the corresponding signals.
Table 8- 1 Encoders which can be connected
Encoders Signal
5-V incremental encoder Differential signals A and /A, B and /B, N and /N
24-V incremental encoder A*, B* and N*
24-V pulse encoder 24-V with directional signal
24-V proximity switch 24 V without directional signal