Honeywell 900 User Manual page 61

Redundant Overview
Item Status
I/O COMM ERROR
ON RESERVE
DATABASE NOT
SYNCHRONIZED
INVALID CONFIG.
FIRMWARE
VERSION
MISMATCH
CONTROLLER GOOD
STATUS
FORCED OUTPUT A block has an output
INVALID CONFIG.
SWITCH FAULT
NO MASTER
PORT
Revision 9
May 2014
Possible Cause Controller Action
Reserve CPU is unable The lead controller
to communicate with will continue to
one or more of the I/O control the process.
racks. Failover to the
reserve is still
possible if a
subsequent failure
renders the current
lead less capable
than the reserve.
Hardware failure on the The lead controller
reserve CPU will continue to
control the process,
but failover is not
Hardware failure on the
possible.
lead CPU
Hardware failure on the
CPU rack backplane
Neither CPU has a valid An empty database
configuration database is created.
The reserve controller The lead controller
does not have the same will continue to
version of controller control the process,
firmware installed but failover is not
possible.
N/A N/A
None
that is forced.
A configuration that An empty database
exceeds the loop is created.
capacity of the controller
was downloaded or an
invalid configuration
exists.
RMS switch is indicating The controller will
an invalid position continue to operate
with a bad RSM.
Automatic failover is
still possible if
required.
The controller The controller is not
configuration contains at scanning the
least on Modbus slave Modbus slave
block, but Serial Port S1 devices.
is not set up as a
Modbus Master port.
900 Control Station User Guide
Main Menu
Diagnostics
What to do
Verify all cabling between the
reserve CPU and the scanners.
Replace any Ethernet switches
between the reserve CPU and
the I/O rack(s).
Replace the reserve CPU
Replace the scanner CPU
Contact Honeywell service
Replace the reserve CPU
Replace the lead CPU
Replace the CPU rack backplane
Contact Honeywell service
Download the desired
configuration file and perform a
cold start.
Upgrade the CPU firmware so
both the lead and reserve have
the same version.
N/A
Remove force on block output..
Download a valid configuration.
Replace RSM
Select Modbus Master or
Modbus Master Advanced
protocol for either the RS-232 or
RS-485 port.
49