Encoders Which Can Be Connected - Siemens simatic s7-400 FM 450-1 User Manual

Encoder signals and their evaluation
9.5 Signal evaluation
9.2

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 9- 1
Encoders
5-V incremental encoder
24-V incremental encoder
24-V pulse encoder
24-V proximity switch
94
Encoders which can be connected
Signal
Differential signals A and /A, B and /B, N and /N
A*, B* and N*
24-V with directional signal
24 V without directional signal
Counter module FM 450-1
Manual, 02/2014, A5E03648739-02