Table 32 - Bad I/O Channel Diagnostics - Honeywell HC900 User And Installation Manual

Fai l ure Description
Number of
Strobes
8 HARDWARE General Hardware Failure
(AI=convertor not working)
9 HW/SW Key The software residing on the
module does not match the module
type. This diagnostic should only
result in the factory.
11 Shift Register The loopback test of the shift
register failed.
Bad I/O Channel Diagnostics
Individual channels on I/O modules indicate their diagnostics by 6 flashes on the Scanner and CPU; the
channel's LED does not indicate a diagnostic. Table 32 is a list of conditions that can cause a bad channel
diagnostic.
Module Failure message
Type indicated on Honeywell
OI or Honeywell
HCDesigner/Utilities
function block monitor
AI Burnout Failure
Under range
Over range
Failing to convert
AO Bad Channel
DO Bad Channel
Revision 6
21 April 2017
AI AO DI

Table 32 – Bad I/O Channel Diagnostics
Description
The sensor – T/C, RTD, or mV source -- is
failing burnout checks.
The signal at the terminals is less than
10% below the range of the sensor.
The signal at the terminals is more than
10% over the range of the sensor.
When attempting to take a reading, the
ADC fails. This could result if the incoming
signal is either too large or small. It also
could result if the ADC circuit is failing. If
the problem is the ADC circuit, most likely
other channels will have the same failure.
The board indicates that the channel is
failing to output the correct value.
The number of configured channels in the
DO function block exceeds the number of
hardware channels on the DO card.
HC900 Process & Safety Controller User and Installation Manual
DO
Contact AC DC Relay AC DC
    
     
PFQ User Action
Replace module.
Replace module
Replace module
User Action
Check terminal block
connections
Replace source element
Replace module.
Check the signal level being
applied to the terminals.
Replace module.
Check the signal level being
applied to the terminals.
Replace module.
Check the signal level being
applied to the terminals.
Replace module.
Check terminal connections.
Replace module.
Reconfigure the DO function
block.
Replace DO card with correct
number of channels.
189