Siemens simatic s7-400 FM 450-1, Руководство пользователя, Страница: 96 / 130

Encoder signals and their evaluation
9.5 Signal evaluation
Counter module FM 450-1
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Manual, 02/2014, A5E03648739-02
Monitoring encoder signals
The module monitors the cable connection, and detects wire-break or short-circuit.
You can define which of the three signal pairs to include in monitoring in your program.
There is no need to wire any unused signal pairs, if you have disabled the corresponding
diagnostics functions in the program (monitoring.)
An error state at all three signals indicates a defective encoder, or a short-circuit at the
"5.2 V DC" encoder supply, or a missing encoder.
When programming is completed, and the module detects an error, the error information will
be written to the diagnostics data records DS0 and DS1. This situation my lead to a
diagnostics interrupt if programmed accordingly.
Coding plug (only for FM 350-1)
To operate this encoder, insert the coding plug in position A.