Rockwell Automation 1756-HSC ControlLogix High Speed Counter Module - Manual (Page 84)

Publication 1756-UM007C-EN-P - November 2011
84 Module Diagnostics
Fault Type Determination
When you are monitoring a module’s configuration properties in
RSLogix 5000 software and receive a Communication fault message, the
Connection tab lists the type of fault under Module Fault.
Troubleshoot the 1756-HSC
Module
This table describes troubleshooting procedures for the 1756-HSC module.
Description Take this action
The present count does not move into the
stored count when Z-input is pulsed. 1. Make sure the Storage mode is not set
to 0.
2. Make sure the Z-input pulse width is
within the specification (that is, the
pulse width is long enough).
The counter does not increment or
decrement when there are pulses on the
A-input or B-input. 1. Make sure there is a value on the
Rollover register.
2. Make sure the module is not configured
for Frequency mode.
The output does not turn On when the
On/Off window is selected and the counter
value is within the On/Off window? Make sure the C.Output[x].ToThisCounter is
not set to 0 (which means ‘Not Tied to
Counter’).
The outputs do not turn off despite a
module fault. Make sure the C.Output[x].FaultMode is not
set to 1 (which means ‘Outputs Turn Off’
during a fault).
The module outputs remain On when the
owner-controller is in Program mode Make sure C.Output[x].FaultMode is not set
to 1 (which means ‘Outputs Turn Off’ during
a fault.
An output must be forced On. Set the O.OutputControl[x] bit to 2.
An output must be forced Off. Set the O.OutputControl[x] bit to 1.