Honeywell Controller C50 CPU 900C50-0360-00
Item Status Possible Cause Controller Action What to do
Protocol Mismatch C70R only. The
firmware version in
the controller CPU is
not compatible with
the firmware version
in the I/O scanner
Controller continues to run
but is not able to access
the I/O on the associated rack
Upgrade the firmware in the CPU
and/or scanner to be compatible
versions
I/O Module Diagnostics and I/O Calibration
Select a rack to see its I/O module diagnostics. For I/O Calibration, see page 159.
Table 20 I/O module diagnostics
Item Description
MODULE Slot number in the rack.
PHYSICAL TYPE NONE
AI UNIVERSAL 8-CHAN
AI LO-LEVEL 16-CHAN
AI HI-LEVEL 8-CHAN
AO CURRENT 4-CHAN
AO VOLTAGE 4-CHAN
DI DRY-CONTACT 16-CHAN
DI 120/240 VAC 16-CHAN
DI 24 VDC 16-CHAN
DO LO-CURRENT RLY 8-CHAN
DO HI-CURRENT RLY 4-CHAN
DO 120/240 VAC 8-CHAN
DO 24 VDC 16-CHAN
AI HI-LEVEL 16-CHAN
DI 24 VDC 32-CHAN
DO 24 VDC 32-CHAN
PULSE/FREQ/QUAD 4-CHAN
HIGH LEVEL AO 8 CHANNEL
HIGH LEVEL AO 16 CHANNEL
CONFIGURED AS Analog Input, Analog Output, Digital Input, Digital Output, Pulse Frequency
Quadrature
ERROR STATUS See Table 22.
Table 21 I/O module Details
Item Description
MODULE Slot number in the rack.
PHYSICAL TYPE NONE
AI UNIVERSAL 8-CHAN
AI LO-LEVEL 16-CHAN
AI HI-LEVEL 8-CHAN
AO CURRENT 4-CHAN
AO VOLTAGE 4-CHAN
DI DRY-CONTACT 16-CHAN
DI 120/240 VAC 16-CHAN
DI 24 VDC 16-CHAN
DO LO-CURRENT RLY 8-CHAN
DO HI-CURRENT RLY 4-CHAN
DO 120/240 VAC 8-CHAN
DO 24 VDC 16-CHAN
AI HI-LEVEL 16-CHAN
DI 24 VDC 32-CHAN
DO 24 VDC 32-CHAN
PULSE/FREQ/QUAD 4-CHAN
HIGH LEVEL AO 8 CHANNEL
HIGH LEVEL AO 16 CHANNEL
PART NUMBER The re-order part number of the module.
FIRMWARE REV. Revision level of the firmware running on this module.

I/O Module Error Status
Table 22 I/O Module Error Status
Status Possible Cause Controller Action What to do
HI CJ TEMP Possible causes of
this diagnostic are:
1. One of the two CJs
on the module is indicating a
temperature reading
greater than 70 degrees C.
2. Both cold-junction
sensors are failing to convert.
3. The CJs are
converting properly,
but their differential is
greater than 10
degrees C.
1. Associated AI blocks that are configured
as T/Cs set their fail pin on, their warn pin
off, and their output pin to the failsafe value.
2. Associated AI blocks that are configured
as T/Cs set their IO status to “CJ High
Temperature” for reason 1 or “CJ Failure”
for possible causes 2 and 3.
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. Associated rack monitor block’s
HITEMP pin is turned on.
6. SYSTEM MONITOR block’s HITEMP
pin is turned on.
7. SYSTEM MONITOR block’s HW OK
pin is turned off.
1. Improve ventilation to rack
2. Replace AI module
MISMATCH The installed module
does not agree with
the module required
for the control
strategy downloaded
in the configuration file.
1. Associated blocks set their fail pin on,
their warn pin off, and their output pin to the
failsafe value.
2. Associated blocks set their IO status to
“Channel No Comm”.
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. SYSTEM MONITOR block’s HW OK
pin is turned off.
1. Verify configuration
2. Replace module with the correct one.
Status Possible Cause Controller Action What to do
MISSING/NO
COMM
Main CPU is unable
to communicate to
the module for one of
the following reasons:
1. Module is not installed
2. The module cannot
communicate with the
controller CPU or the
expansion rack CPU
because of a
backplane problem.
3. Module is on an
expansion rack and
the expansion rack
communications is failing
See MISMATCH. Action is based on the RACK STATUS
indication. If RACK STATUS is not
MODULE ERROR, then follow the
prescribed action defined for the RACK
STATUS diagnostic.
For MODULE ERROR, do the following:
1. Verify configuration
2. Install module.
BAD MODULE Module is reporting a
diagnostic condition.
See Table 23.
See MISMATCH. User should inspect the module’s status
LED to determine the nature of the
problem. Table 23 describes the user
action for the various LED diagnostics. BAD CHANNEL
See Table 24 1. Associated block sets its fail pin on, its
warn pin off, and its output pin to the
failsafe value.
2. Associated block sets its IO status as
denoted in Table 24.
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. SYSTEM MONITOR block’s HW OK
pin is turned off. See Table 24