Troubleshooting
B-3
High Speed Counter Encoder Module User Manual
B.2 Troubleshooting
T
able B-3
presents basic troubleshooting suggestions for the module.
T
able B-3
Tr
oubleshooting Suggestions
Re-seat board
Check jumper position and condition of jumper (metal
insert intact); also check Setup and Preset words.
Symptom Probable Cause Corrective Action
Signal wire noise
Module not configured
in controller I/O
configuration table
See Wiring the Module, Section 2.3
Configure module
Return module for repair
Check your base power supply; user power supply
Check wiring
Check output disable
Incorrect count
Connections wrong
Counts in wrong
direction
Connections wrong
Counts erratically Wrong quadrature mode
Pulse too narrow, or frequency
too high
Change input frequency filter jumper
Reverse wiring for inputs A and B
Trace wiring connections
Change encoder
Check signal wire noise
Marginal input signal
Does not count Count being reset or inhibited Check Reset and Inhibit signals from field
Controller does
not communicate
with module
Broken wire Check continuity
Broken wire Check continuity
Broken wire Check continuity
Input wires substantially
different lengths
Check that wires are as short as possible, and make
wires the same length (if possible)
Input wires substantially
different lengths
Check bits in Setup word and error bits in Status
Check for bent pins on board connector
No power to board
Outputs disabled or no
24 V power supply
Check that wires are as short as possible, and make
wires the same length (if possible)
Check Reset and Inhibit bits in Setup word
Module has failed
self-diagnostics
No LEDs on
No Output LEDs on
Wrong filter selection
Wrong quadrature mode Check Quadrature Mode
Check input filter selection
Module failed Check User Power or Setup Word bit WY20.02
Mechanical input switch may
have bounce
Debounce input switch
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