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Diagnostics and troubleshooting
8.2 Diagnostic messages
Wire-Break Diagnostics
The following table lists some of the possible causes of an encoder wire-break and some
possible actions you can take to remedy the problem. The diagnostic function cannot identify
the exact cause of the fault. It is also not possible for wire-break diagnostics to detect all
connection and hardware faults.
Table 8- 6
Encoder broken wire diagnostics
Possible causes
Possible corrective actions
Encoder cable broken or not plugged in.
Check the encoder cable to ensure that wires are
properly connected.
Encoder has no quadrature signals.
Incorrect pin assignment.
Encoder signals short-circuited.
The encoder is not operating.
Ensure that your installation conforms to the encoder
specifications and to the FM 352-5 module requirements.
Check the parameters that you assigned in the
"Hardware Configuration" dialog, "Parameters" tab to
ensure correct setup.
Note
When broken wire diagnostics is enabled and the SSI absolute encoder is not selected,
signals A, /A (inverse), B, /B (inverse), and N, /N (inverse) signals are checked.
When broken wire diagnostics is enabled for an SSI absolute encoder, only signals D and /D
(inverse) are checked.
FM 352-5 high-speed Boolean processor
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Operating Manual, 05/2011, A5E00131318-04