200 ControlEdge HC900 Process & Safety Controller User and Installation Manual Revision 10
May 2019
One of the exception vectors
located in RAM became
corrupted.
The vector is restored to the proper
value and the Scanner continues to
operate normally.
Flash failed to burn properly
when the firmware was being
upgraded.
The boot code is the only software
running. This software waits for a
request to burn the flash. It does no
scanning of modules. Module outputs
remain in their off state.
C75 only. The communications
with the reserve is failing for
the following reasons:
1. There is a problem with the
connection between the
scanner and the reserve.
2. The scanner port used to
communicate to the reserve
has a hardware failure
C75 only. This problem may cause on-
demand failover attempts to be
unsuccessful.
C75 only:
1. Verify that the CPU A
cable is connected to the A
port, and the CPU B cable
is connected to the B port
on the Scanner 2.
2. If a switch is used, check
that all cables are properly
connected to the switch,
proper crossover cables
are used, that the switch is
powered, and it supports
100 Base-T.
3. Check cable shielding for
proper grounding and
noise immunity.
4. Make sure the cables have
the correct pinout.
5. Cycle power to the
Scanner 2.
6. Cycle power to the switch.
7. Cycle power to the
reserve.
8. Replace the expansion
rack’s scanner module.
9. Ensure that the Scanner 2
and reserve software
versions are compatible. If
not, perform a firmware
upgrade.
10. Replace the expansion
rack’s power supply.
11. Replace the expansion
rack.
12. Replace the main CPU.
The modules installed do not
agree with those required by
the configuration.
Verify that the correct
modules are installed for the
configuration.
The Scanner cannot
communicate to a module or
the module is experiencing a
diagnostic condition.
For each module with a red
blinking LED, follow the
actions described in the I/O
Module Diagnostic Indication,
page 196.
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