Allen-Bradley SLC 500 Installation And Operation Manual

10–18 Troubleshooting
Publication 1747-6.2
The Following
Error Exists
Probable Cause Recommended Action
The SLC 5/03
and SLC 5/04
processors are
trying to
establish
communication,
but cannot find
ot acti
DH-485 or DH+
communication
parameters are
improperly set up.
1. Check communication parameters of programmer.
Programmer and processor baud rate must match.
Programmer and processor node addresses must be
different.
2. Try different combinations of:
a. baud rate (Processor default is 19.2K for DH-485 on
the SLC 5/03, and 57.6K for DH+ on the SLC 5/04.)
b. node address (Processor default is 1.)
3. Try to increase the maximum node address. (Default
is 31 for the SLC 5/03 processor only.)
See your programming software user manual for channel
configuration information.
other active
nodes. (The
LED is flashing
green on the
SLC 5/03 and
SLC
5/0
4.)
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). Replace if necessary.
SLC 5/0
4.)
Low or No Power
to Communication
Device
1. Verify proper power supply selection and backplane
loading. (The 1747-PIC and 1747-AIC draw power off the
backplane.)
2. Verify proper 120/240V power supply jumper selection.
See page 6–8.
Duplicate drop
is detected.
(The LED is
flashing red on
the SLC 5/04.)
Another DH+
device is already
on the DH+
network at the
node address of
this same device.
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 LED is
flashing red on
the SLC 5/05.)
A hardware or
software fault has
occured.
Contact Allen-Bradley Global Technical Services for
assistance.
Refer to the following key to determine the status of
the LED indicators:
Indicates the LED is OFF.
Indicates the LED is ON.
➀
The DH485 LED on the SLC 5/03 processor is labeled DH+ on
the SLC 5/04 processor, and ENET on the SLC 5/05 processor.
Indicates the LED is FLASHING.
Status of LED does not matter.
ÉÉ
ÉÉ
Indicates the LED is FLASHING or OFF.
POWER
RUN
FLT
BATT
É
FORCE
DH485
RS232
If the LEDs indicate:
➀

Allen-Bradley SLC 500 Specifications

General

Programming Software	RSLogix 500
Communication Ports	RS-232, DH-485, DH+
Power Supply	120/240V AC or 24V DC
Programming Languages	Ladder Logic
Operating Temperature	0°C to 60°C (32°F to 140°F)
Relative Humidity	5% to 95% (non-condensing)
Memory	4K to 64K words (depending on the processor)