Rockwell Automation 1747-L5xx SLC 500 Modular Hardware Style User Manual User Manual
Page 156
Publication 1747-UM011G-EN-P - June 2008
156
Troubleshooting
•
Power status indicator is
on
•
DH-485, DH+, or ENET
status indicator is
flashing
•
FLT status indicator is off
or flashing
•
Status of Run, Force,
Batt, and RS232 status
indicators do not matter
The SLC 5/03 or
SLC 5/04
processor is trying
to establish
communication,
but cannot find
other active nodes.
(The DH-485 or
DH+ status
indicator is
flashing green.)
DH-485 or DH+
communication
parameters are
improperly set up.
1. Check communication parameters of programmer.
Programmer and processor communication rate must match.
Programmer and processor node addresses must be
different.
2. Try different combinations of:
a. communication rate (default is 19.2 K for DH-485 and 57.6
K for DH+)
b. node address (default is 1)
3. Try to increase the maximum node address.
(default is 31 for DH-485)
Bad connection of
communication
device.
1. Check cable continuity.
2. Check cable connections between programmer and
processor.
3. Check communication device (for example, the 1747-PIC
interface). Replace if necessary.
Low or no power to
communication
device.
1. Verify proper power supply selection and backplane loading.
(1747-PIC and 1747-AIC interface draw power off the
backplane.)
2. Verify proper 120/240V power supply jumper selection. See
Duplicate drop is
detected. (The DH+
status indicator is
flashing red.)
Another DH+
device is already
on the DH+
network at this
node address.
1. Remove this device from the DH+ network.
2. Cycle power.
3. Reset the node address to an unused node before
reconnecting device to the DH+ network. (Can perform reset
if on-line via channel 0 RS-232 port without disconnecting
from DH+.)
An ENET fault is
being reported via
a code. (The ENET
status indicator is
flashing red.)
A hardware or
software fault has
occurred.
Contact Rockwell Automation for assistance.
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