Troubleshooting 4-1
Series
505 High Speed Counter
and Encoder Module User
’
s Manual

Chapter 4

Troubleshooting
Re-seat board
Check jumper position
and condition of jumper (metal insert intact)
Symptom
Probable Cause Corrective Action
Input LED is
not on
and
Output LED is
not on
Signal wire noise
Module not configured
in controller I/O
configuration table
Module configured
incorrectly in controller
Module has failed
self-diagnostics
Nonfatal error
as a result of the
module
See wiring considerations ( Section 2.1.4)
Configure module
Return module for repair
Reconfigure the module
Check your base power supply
Check wiring
Check encoder or field inputs
Incorrect count
Connections wrong
Counts in wrong
direction
Connections wrong
Counts erratically
Wrong quadrature mode
or 2 jumpers on same chan
-
nel
Pulse too narrow
, or
frequency too high Use slower gear ratio and
higher resolution count
Reverse wiring for inputs A and B
T
race wiring connections
Counts too fast
or too slow
Check quadrature mode
Check signal wire noise
Marginal input signal
Does not count
Count being reset or in
-
hibited
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
dif
ferent lengths
Check that wires are as short as possible, and make
wires the same length (if possible)
Input wires substantially
dif
ferent lengths
Check Reset and Inhibit bits in Setup word (WY4)
Check for bent pins on board connector
No power to board
Problems with input
signals, or output being
reset or inhibited
Check that wires are as short as possible, and make
wires the same length (if possible)
Check Reset and Inhibit bits in Setup word (WY4)