Troubleshooting; Table B-3 Troubleshooting Suggestions - Siemens SIMATIC TI505 User Manual

B.2

Troubleshooting

Symptom
No LEDs on No power to board
Module has failed
self-diagnostics
Outputs disabled or no
No Output LEDs on
24 V power supply
Counts in wrong Connections wrong
direction
Input wires substantially
different lengths
Incorrect count
Connections wrong
Input wires substantially
different lengths
Broken wire
Wrong quadrature mode
Counts erratically Wrong quadrature mode
Signal wire noise
Broken wire
Pulse too narrow, or frequency
too high
Wrong filter selection
Mechanical input switch may
have bounce
Does not count Count being reset or inhibited Check Reset and Inhibit signals from field
Broken wire
Controller does Module not configured
not communicate in controller I/O
with module configuration table
Module failed
High Speed Counter Encoder Module User Manual
Table B-3 presents basic troubleshooting suggestions for the module.

Table B-3 Troubleshooting Suggestions

Probable Cause Corrective Action
Re-seat board
Check for bent pins on board connector
Check your base power supply; user power supply
Return module for repair
Check wiring
Check output disable
Check bits in Setup word and error bits in Status
Reverse wiring for inputs A and B
Check that wires are as short as possible, and make
wires the same length (if possible)
Trace wiring connections
Check that wires are as short as possible, and make
wires the same length (if possible)
Check continuity
Check Quadrature Mode
Check jumper position and condition of jumper (metal
insert intact); also check Setup and Preset words.
See Wiring the Module, Section 2.3
Check input filter selection
Check continuity
Change input frequency filter jumper
Change encoder
Check signal wire noise
Marginal input signal
Debounce input switch
Check Reset and Inhibit bits in Setup word
Check continuity
Configure module
Check User Power or Setup Word bit WY20.02
Troubleshooting B-3