Honeywell 900U02-0100 - Table 29 - Controller Status LED Diagnostics

Revision 10 ControlEdge HC900 Process & Safety Controller User and Installation Manual 189
May 2019
Table 29 – Controller Status LED Diagnostics
Number
of Red
Strobes
Possible Causes
Lead and/or Reserve
Controller Action(s)
User Action
Honeywell OI
Indication
HCDesigner/HC
Utilities
Indication
1
RAM or ROM failed
on power-up.
Executes an infinite loop that
toggles the LED.
Communications and control
are disabled.
1. Cycle power
2. Replace CPU
3. Replace power supply
4. Replace rack
5. Check grounding
6. Ensure system is properly
isolated from noise
Not available
because the
C75
communication
ports are
disabled.
Not available
because the
C75
communication
ports are
disabled.
2
At least one function
block has an output
that is forced.
The block’s output(s) is/are
forced to the value(s) specified.
If it is not desirable to have forced
block outputs, use HCDesigner
to locate and remove the forced
outputs.
See SYSTEM
in the “Controller
Diagnostics
Overview”
display.
See System
Diagnostics in
the “Diagnostic
Overview”
dialog box.
2
The RAM and
FLASH copies of
the configuration
database were
corrupted and are
now set to a valid
empty database.
Usually this is a
result of a firmware
upgrade.
An empty database is created,
and the lead and reserve will
not synchronize. The reserve’s
RSM LED is flashing to indicate
it’s not synchronized with the
lead.
Use HCDesigner, HCUtilities, or
OI to download a valid
configuration.
2
One of the following
RSM failures was
detected:
1. The RSM module
is not installed.
2. The RSM switch
position is invalid.
3. The lead and
reserve switch
positions do not
agree.
The lead uses its own switch
reading and dictates to the
reserve what the mode is. If the
lead’s switch position is invalid,
then the lead uses the last good
known position prior to the
failure.
If failover occurs, the new lead
will assume the mode prior to
failover until a good switch
reading is acquired.
If after the power is cycled to
both the lead and reserve, and
the lead is unable to acquire a
valid switch position, the system
will default to the run-program
mode of operation.
This diagnostic will cause the
HWOK pins of the analog and
fast logic “System Monitor”
blocks (AYSY and FSYS) to be
turned off.
1. Install RSM if none present.
NOTE: WHEN PLUGGING IN
THE RSM INTO A LIVE UNIT,
YOU MUST MAKE SURE THE
SWITCH IS IN THE PROPER
STATE PRIOR TO
INSERTION.
2. If the key is installed in the
RSM, remove it to make sure
the switch is seated properly. If
the key does not pull out, turn it
slightly to the proper position
until it can be removed.
3. Replace the RSM
4. Replace reserve CPU
5. Replace lead CPU
6. Replace rack