Honeywell HC900 Installation And User Manual page 179

Diagnostics and Troubleshooting - Controller CPU indicators
Number Possible Causes
of Red
Strobes
5 One of the following
RTC conditions
occurred:
• RTC was
previously
programmed, but
when it was last
read, its date and
time were deemed
invalid.
• An attempt was
made to program
the RTC, but it was
unsuccessful.
• The RTC is unable
to be read. Usually
indicating a serious
hardware failure.
6 One of the following
remote I/O conditions
exist:
• Communications
between the CPU
and a Scanner 2 is
failing.
• Scanner 2 is
unable to
communicate to a
module or a wrong
module is installed.
• A module in the I/O
rack is reporting a
diagnostic.
• C75 and Scanner 2
firmware versions
are incompatible.
• Scanner 2, I/O
rack, or power-
supply is defective.
• C75 module is
defective
• A bad channel has
been detected on
one of the
modules.
Revision 19
06/14
Lead and/or Reserve Controller
Action(s)
Same actions as described above. 1. Use HCDesigner, HCUtilities, or OI
1. Associated blocks set their fail pins
on, their warn pins off, and their
output pins to the failsafe value.
2. Associated blocks set their IO
statuses to either "Channel No
Comm" if the module cannot be
communicated to or a message
indicating the bad channel
condition.
3. Associated rack monitor block's
module fail pin is turned on.
4. Associated rack monitor block's
RACK OK pin is turned off.
5. ASYS and FSYS blocks' HW OK
pins are turned off.
HC900 Process Controller Installation and User Guide
User Action
to program the real-time clock
(RTC).
2. If problem persists, replace the CPU
module
Locate the Scanner 2 that has a
status LED indicating a diagnostic,
and follow the scanner 2 diagnostic
section to solve the problem.
Honeywell OI HCDesigner/HC
Indication Utilities Indication
See the See "Rack
associated rack's Diagnostics"
"Rack Diagnostics dialog box.
Overview" display
for details
regarding the
diagnostic.
167