Honeywell HC900 Installation And User Manual page 140

Diagnostics and Troubleshooting - User Interface
Table 27 - Controller Module Diagnostics
OI Screen OI Screen
Item Item Value
RS-232 GOOD
DATA LINK
FAILURE
130
Number of Possible Cause
LED
Strobes
N/A N/A
8 A large number of
messages are
resulting in data link
errors.
HC900 Hybrid Controller Installation and User Guide
Control File Action
N/A
1. Rack 1 monitor block's
COMPORT DIAG is set
to FAILED.
2. Rack 1 monitor block's
RACK OK pin is turned
off.
3. ASYS block's HW OK
pin is turned off.
4. If configured as a
Modbus master:
1. ASYS and FSYS
blocks' Modbus Master
Fail pins are turned on.
2. Slave and read blocks
associated with the
slaves experiencing the
failure have their read
pins frozen to the last
value read.
3. Slave blocks associated
with the slaves
experiencing the failure
have their BAD COMM
and NO SCAN pins
turned on.
4. IN SCAN STATUS is
set to NO for all slaves
experiencing the failure.
5. COMM STATUS is set
to BAD for all slaves
experiencing the failure.
6. The slaves with the data
link errors have a non-
zero data link error
count.
7. The slaves experiencing
the failure are moved to
the background scan
rate.
User Action
N/A
1. Check baud rate
2. Check connectors
3. Check cable polarity
4. Isolate cabling from
electrical
interference
5. If RS232 to RS485
converter is used,
check its power,
switch/jumper
settings, and polarity.
6. If configured as a
Modbus master, use
the slave status
screens to determine
which slaves are
experiencing the
problem. For those
slaves check:
• power
• connections
• address
• baud rate
• parity
• number of stop bits
• for electrical
interference
• grounding
• termination resistor (if
at end of link)
7. The diagnostic is
cleared by clearing
the port's statistics.
Revision 5
9/03