Rockwell Automation 1747-L5xx SLC 500 Modular Hardware Style User Manual - Manual (Page 158)

Publication 1747-UM011G-EN-P - June 2008
158 Troubleshooting
• Power status indicator is
on
• RS232 status indicator is
off
• FLT status indicator is off
or flashing
• Status of Run; Force;
DH-485, DH+, or ENET;
or Batt status indicators
do not matter
The processor is
not transmitting
Channel is
configured for
DH-485 mode.
Check communication parameters of channel configuration.
Also, refer to your programming software documentation.
RS232/DF1
parameters are set
up improperly.
Check the following communication parameters of programmer
and channel configuration.
1. communication rate - programmer and processor
communication rates must match
2. DF1 node addresses (default is 1 for half-duplex, and 9 for
full-duplex) - programmer and processor addresses must be
different
3. error checking
4. number of data bits
Hardware problem. 1. Check cable connections.
2. Check cable pinouts. Also, see appendix C for RS-232
pinouts.
• Power status indicator is
on
• FLT status indicator is on
• Status of all other status
indicators do not matter
A fatal error has
occurred
Excessive noise or
a faulty processor.
1. Cycle power to obtain flashing FLT status indicator and
default program.
2. Examine the error code following the power cycle. Take
appropriate action.
3. Reload the program.
4. Contact your local Rockwell Automation representative if the
error persists.
SLC 5/03. SLC 4/04, and SLC 5/05 Communication Errors
If the status indicators
indicate The following
error exists Probable Cause Recommended Action