Allen-Bradley SLC 500 1747-L511 User manual

PLC-CPU
MANUFACTURER DATA SHEET
Allen-Bradley/Rockwell
SLC500
Manufacturer:
Model Number:
PDF File: Doc_000074_Cover.pdf
See www.geomartin.com for additional PDF datasheets
Martin Part Number:
E-014624-00
VendorPartNumber:
1747-L524

This page is intentionally left blank

Installation
and
Operation
Manual
SLC 500tModular
Hardware Style
(Cat. Nos. 1747-L511, 1747-L514,
1747-L524, 1747-L531, 1747-L532,
1747-L541, 1747-L542, 1747-L543,
1747-L551, 1747-L552, and
1747-L553)
Allen-Bradley

Because of the variety of uses for the products described in this
publication, those responsible for the application and use of this
control equipment must satisfy themselves that all necessary steps
have been taken to assure that each application and use meets all
performance and safety requirements, including any applicable laws,
regulations, codes and standards.
The illustrations, charts, sample programs and layout examples
shown in this guide are intended solely for purposes of example.
Since there are many variables and requirements associated with any
particular installation, Allen-Bradley does not assume responsibility
or liability (to include intellectual property liability) for actual use
based upon the examples shown in this publication.
Allen-Bradley publication SGI-1.1, Safety Guidelines for the
Application, Installation, and Maintenance of Solid-State Control
(available from your local Allen-Bradley office), describes some
important differences between solid-state equipment and
electromechanical devices that should be taken into consideration
when applying products such as those described in this publication.
Reproduction of the contents of this copyrighted publication, in
whole or in part, without written permission of Allen-Bradley
Company, Inc., is prohibited.
Throughout this manual we use notes to make you aware of safety
considerations:
!ATTENTION: Identifies information about practices
or circumstances that can lead to personal injury or
death, property damage or economic loss.
Attention statements help you to:
•identify a hazard
•avoid the hazard
•recognize the consequences
Important: Identifies information that is critical for successful
application and understanding of the product.
PLC, PLC–2, PLC–3, and PLC–5 are registered trademarks of Rockwell Automation. SLC, SLC 500, SLC 5/01, SLC 5/02, SLC 5/03, SLC 5/04, SLC
5/05, PanelView, PanelView 550, PanelView 900, RediPANEL, ControlView, PBASE, DH+, DTAM, DeviceNet, and Dataliner are trademarks of
Rockwell Automation. RSLogix 500 and RSLinx are trademarks of Rockwell Software, Inc. Ethernet is a registered trademark of Digital Equipment
Corporation, Intel, and Xerox Corporation. IBM is a registered trademark of International Business Machines, Incorporated. Multimodem is a
trademark of Multi–Tech Systems, Inc. Procomm is a registered trademark of Datastorm Technologies, Inc. Tandy is a trademark of the Tandy
Corporation. Gateway 2000 is a trademark of Gateway 2000, Inc. Toshiba is a trademark of Toshiba America, Inc. Compaq is a registered trademark
of Compaq Computer Corporation. Deskpro is a trademark of Compaq Computer Corporation. Intel is a trademark of Intel Corporation.
Important User
Information

6–8 Installing Your Hardware Components
Publication 1747-6.2
If you have multiple chassis configurations, install the chassis
interconnect cable before installing the power supply.
(See page 6–10.) Also, the power supply terminals accept two #14
AWG wires and are marked as shown in the figure on page 6–8. To
install the power supply, do the following:
1. Align the circuit board with the card guide on the left side of the
chassis. Slide the power supply in until flush with the chassis.
19524
2. Fasten the power supply to the chassis with the two Phillips head
screws.
3. Place the jumper to match the input voltage. (This does not apply
to 1746-P3 or 1746-P5, which do not have a jumper.)
!ATTENTION: Make jumper selection before
applying power. Hazardous voltage is present on
exposed pins when power is applied.
Installing Your Power
Supply

6–9 Installing Your Hardware Components
Publication 1747-6.2
POWER
Fuse
POWER
100/120 V olts
200/240 V olts
Fuse
85–132V ac
170–265V ac
Jumper
Selection
Jumper
Selection
POWER POWER
120/240V ac
V ac NEUT
CHASSIS GROUND
dc NEUT
+ 24V dc
CHASSIS GROUND
JUMPER
170–265V ac
L2 NEUTRAL
L185–132/170–265
85–132V ac
CHASSIS GROUND
+125V dc
dc NEUT
CHASSIS GROUNDCHASSIS GROUND
PWR OUT COM
PWR OUT COM
PWR OUT +24V dc
PWR OUT +24V dc
PWR OUT +24V dc
PWR OUT COMMON
NOT USED
NOT USED
User
Power
User
Power
User
Power
1746-P1 and -P2
1746-P4 1746-P5
1746-P3
4. Remove the warning label from the top of the power supply.
5. Connect line power to the power supply.
!ATTENTION: If you have a 1746-P3, see page 3–5
for special grounding considerations.
On the 1746-P1 and -P2 power supply, use the PWR OUT + 24 VDC
and PWR OUT COM terminals to power sensors. The terminals
provide an isolated, nonfused, 200 mA, 24V dc power supply.

6–10 Installing Your Hardware Components
Publication 1747-6.2
Two cables are available to link modular hardware chassis. Catalog
Number 1746-C7 cable is 152.4 mm (6 in.) in length and used when
connecting chassis side-by-side. Catalog Number 1746-C9 is
914.4 mm (36 in.) in length and used to link one chassis below the
other.
!ATTENTION: Do not use any other cables than those
provided. Longer cables could affect the integrity of
data communications between the chassis, possibly
causing unsafe operation. Also, make sure the cable is
properly secured to protect against the effects of shock
and vibration.
Install the chassis interconnect cable before installing the power
supply in multiple chassis configurations.
The cables are “keyed” for proper installation. The end of the cable
that plugs into the right socket in the chassis has the “key” on the top
of the connector. The opposite end of the cable has the “key” on the
inside of the connector for insertion into the expansion chassis.
To remove the cable, move the tabs on the socket outward and the
connector pops out.
!ATTENTION: The expansion cable must always exit
the right end of the chassis with the processor. Refer to
the following figures.
C
P
U
Chassis 1
Chassis 2
CORRECT INSTALLATION
C
P
U
Chassis 1
Chassis 2
INCORRECT INSTALLATION
C
P
U
Chassis 1
Chassis 2
INCORRECT INSTALLATION
Chassis 1
Chassis 2
INCORRECT INSTALLATION
P
SP
S
P
SP S
P
SP
S
P
SP
S
C
P
U
Installing Your Chassis
Interconnect Cable

Chapter 7
Publication 1747-6.2
Wiring Your I/O Modules
This chapter describes how to wire your I/O modules. It covers the
following:
•defining sinking and sourcing
•preparing your wiring layout
•features of an I/O module
•recommendations for wiring I/O devices
•wiring your I/O modules
•octal label kit installation
•using removable terminal blocks
Sinking and sourcing are terms used to describe a current signal flow
relationship between field input and output devices in a control
system and their power supply.
•Field devices connected to the positive side (+V) of the field
power supply are sourcing field devices.
•Field devices connected to the negative side (DC Common) of the
field power supply are called sinking field devices.
To maintain electrical compatibility between field devices and the
programmable controller system, this definition is extended to the
input/output circuits on the discrete I/O modules.
•Sourcing I/O circuits supply (source) current to sinking field
devices.
•Sinking I/O circuits receive (sink) current from sourcing field
devices.
Europe: DC sinking input and sourcing output module circuits are
the commonly used options.
Defining Sinking and
Sourcing

Chapter 10
Publication 1747-6.2
Troubleshooting
In this chapter, you will learn about:
•calling Allen-Bradley for assistance
•tips for troubleshooting your control system
•troubleshooting the SLC 5/01 and SLC 5/02 processors
•troubleshooting the SLC 5/03, SLC 5/04, and SLC 5/05
processors
•troubleshooting your input modules
•troubleshooting your output modules
If you need to contact Allen-Bradley or local distributor for
assistance, it is helpful to obtain the following (prior to calling):
•processor type, series letter, operating system (OS) number
(obtained from the status file), firmware (FRN) number (see label
on side of processor module)
•processor LED status
•processor error codes (found in S:6 of status file)
•hardware types in system (I/O modules, chassis)
•revision of programming device (on the main menu of the
Hand-Held Terminal or programming software)
Calling Allen-Bradley for
Assistance

10–2 Troubleshooting
Publication 1747-6.2
When troubleshooting, pay careful attention to these general
warnings:
!ATTENTION: Have all personnel remain clear of the
controller and equipment when power is applied. The
problem may be intermittent and sudden unexpected
machine motion could result in injury. Have someone
ready to operate an emergency-stop switch in case it
becomes necessary to shut off power to the controller
equipment. Also, see NFPA 70E Part II for additional
guidelines for safety related work practices.
Never reach into a machine to actuate a switch since
unexpected machine motion can occur and cause
injury.
Remove all electrical power at the main power
disconnect switches before checking electrical
connections or inputs/outputs causing machine motion.
If installation and start-up procedures detailed in chapters 6, 7, and 8
were followed closely, your SLC controller will give you reliable
service. If a problem should occur, the first step in the
troubleshooting procedure is to identify the problem and its source.
The SLC 500 controller has been designed to simplify
troubleshooting procedures. By observing the diagnostic indicators
on the front of the power supply, processor unit and I/O modules, the
majority of faults can be located and corrected. These indicators,
along with error codes identified in the programming device user
manual and programmer’s monitor, help trace the source of the fault
to the user’s input/output devices, wiring, or the controller.
Removing Power
Before working on a SLC 500 modular system, always remove the
power supply input power at the main power disconnect switch.
The power LED on the power supply indicates that DC power is
being supplied to the chassis. The LED could be off when incoming
power is present.
Tips for Troubleshooting
Your Control System

10–3 Troubleshooting
Publication 1747-6.2
Replacing Fuses
When replacing a fuse, be sure to remove all power from the system.
Program Alteration
There are several causes of alteration to the user program, including
extreme environmental conditions, Electromagnetic Interference
(EMI), improper grounding, improper wiring connections, and
unauthorized tampering. If you suspect the memory has been
altered, check the program against a previously saved program on an
EEPROM, UVPROM or Flash EPROM module.
To receive the maximum benefit of this troubleshooting section, we
recommend you follow these steps:
1. Identify the status of your processor LEDs. See chapter 5 for a
description of LEDs and their different states.
2. Using the tables on the following pages, match your processor
and power supply LEDs with the status LEDs located in the first
column.
3. Once the status LEDs are matched to the appropriate table,
simply move across the table identifying error description and
probable causes.
4. Follow the recommended action steps for each probable cause
until the error is corrected.
5. If recommended actions do not correct the error, contact your
local Allen-Bradley sales office or distributor.
Troubleshooting the SLC
5/01 and SLC 5/02
Processors

10–4 Troubleshooting
Publication 1747-6.2
Identifying SLC 5/01 and SLC 5/02 Processor Errors
The following LEDs and tables provide you with information
regarding error messages, possible cause(s) for the error, and
recommended action to take to resolve the error.
The Following
Error Exists Probable Cause Recommended Action
No Line Power
1. Verify proper line voltage and connections on the
power terminals.
2. Verify proper 120/240V power supply jumper
selection. See page 6–8.
Power Supply
Fuse Blown
1. Check the incoming power fuse, check for proper
incoming power connections. Replace fuse.
2. If fuse blows again, replace the power supply. See
page 9–8 on fuse replacement.
Inadequate
System Power Power Supply
Overloaded
1. Remove line power to power supply. Remove
several output modules from the chassis. Wait five
minutes. Reapply power.
2. If condition reoccurs, re-calculate module
configuration power required and verify proper power
supply selection. See page 2–11.
This problem can occur intermittently if power supply is
slightly overloaded when output loading and
temperature varies.
Defective Power
Supply
1. Recheck other probable causes.
2. Monitor the line power to chassis power supply for
possible transient or shorting.
3. Replace the power supply.
The Following
Error Exists Probable Cause Recommended Action
Inadequate
System Power
Improper Line
Power Voltage
Selection
Verify proper 120/240V power supply jumper selection.
See page 6–8.
Refer to the following key to determine the status of
the LED indicators:
Indicates the LED is OFF.
Indicates the LED is ON.
➀The RUN LED on the SLC 5/01 processor is actually
labeled “PC RUN.” Also, the SLC 5/01 processor does
not have a COMM LED.
Indicates the LED is FLASHING.
Status of LED does not matter.
POWER RUN
CPU FAULT
FORCED I/O
BATTERY LOW
COMM
If the LEDs indicate:➀
POWER RUN
CPU FAULT
FORCED I/O
BATTERY LOW
COMM
If the LEDs indicate:➀

10–5 Troubleshooting
Publication 1747-6.2
The Following
Error Exists Probable Cause Recommended Action
Either Improper
Mode Selected or
User Program
Logic Error
1. Verify selected processor mode.
2. If in program/test modes attempt Run mode entry.
3. If in suspend mode, check user program logic for
suspend instructions.
Refer to either the Hand-Held Terminal User Manual
(Catalog Number 1747-NP002) or your programming
software user manual.
Line Power Out of
Operating Range
1. Check proper 120/240V power supply jumper
selection and incoming power connections.
2. Monitor for proper line voltage at the incoming
power connections.
See page 6–8 for power supply installation.
Processor Not in
Run Mode Improper Seating
of Power Supply,
and/or Processor
in the Chassis
1. Remove power and inspect the power supply
chassis connections and the processor chassis
connections.
2. Re-install the devices and re-apply power.
Important: The processor only operates in slot 0 of
chassis #1.
Defective
Processor, Power
Supply or Chassis
1. Attempt Run mode selection of Processor in
existing chassis.
2. Place processor in another chassis not in the
existing system. Apply power, reconfigure and attempt
Run mode selection. If unsuccessful, replace
processor.
3. Try existing power supply in test chassis. If
unsuccessful, replace power supply. If entry into the
Run mode is allowed, replace the existing chassis.
Refer to the following key to determine the status of
the LED indicators:
Indicates the LED is OFF.
Indicates the LED is ON.
➀The RUN LED on the SLC 5/01 processor is
actually labeled “PC RUN.” Also, the
SLC 5/01 processor does not have a COMM
LED.
Indicates the LED is FLASHING.
Status of LED does not matter.
POWER RUN
CPU FAULT
FORCED I/O
BATTERY LOW
COMM
If the LEDs indicate:➀

10–6 Troubleshooting
Publication 1747-6.2
The Following
Error Exists Probable Cause Recommended Action
System
Inoperable,
No Major CPU
ault t ct
User Program
Logic Error
1. Monitor logic in Run mode and verify desired I/O
status.
2. Check for minor CPU faults.
Refer to either the Hand-Held Terminal User Manual
(Catalog Number 1747-NP002) or your programming
software user manual
F
ault
sDe
t
e
ct
ed Defective I/O
Devices or I/O
Wiring
Test inputs and outputs according to I/O troubleshooting
procedures starting on page 10–26.
The Following
Error Exists Probable Cause Recommended Action
CPU Memory
Error Cycle power.
PU ault
Faulty Memory
Module
1. Remove power and then remove the memory module
from the processor.
2. Re-install the processor and re-apply power to the
power supply
If steady CPU FAULT LED changes to flashing, replace the
existing memory module with a replacement module.
Refer to chapter 6 for removing and installing memory
modules.
C
PU
F
ault
Faulty CPU/Power
Supply
1. Place the processor in another chassis not in the
existing system and cycle power.
If steady CPU FAULT LED reappears, replace the
processor.
2. If CPU FAULT LED clears, monitor the line power
going to the power supply in existing system.
3. Replace existing system power supply if line power
checks OK.
Processor
Firmware Installed
Incorrectly
If upgrading the processor to a different firmware level,
verify firmware chip orientation matches the upgrade kit
directions.
Refer to the following key to determine the status of
the LED indicators:
Indicates the LED is OFF.
Indicates the LED is ON.
➀The RUN LED on the SLC 5/01 processor is
actually labeled “PC RUN.” Also, the
SLC 5/01 processor does not have a COMM
LED.
Indicates the LED is FLASHING.
Status of LED does not matter.
POWER RUN
CPU FAULT
FORCED I/O
BATTERY LOW
COMM
If the LEDs indicate:➀
POWER RUN
CPU FAULT
FORCED I/O
BATTERY LOW
COMM
If the LEDs indicate:➀

10–7 Troubleshooting
Publication 1747-6.2
The Following
Error Exists Probable Cause Recommended Action
Initial CPU Factory
Power-up
Condition
1. Refer to chapter 8 and follow the start-up procedures.
2. Clear processor memory to get rid of the flashing CPU
FAULT LED.
CPU Major
Fault
Hardware/Software
Major Fault
Detected
Erratic repetitive
power cycling can
cause a processor
major hardware
fault.
1. Monitor Status File Word S:6 for major error code.
2. Refer to either the Hand-Held Terminal User Manual
(Catalog Number 1747-NP002) or the Instruction Set
Reference Manual for error codes and additional
troubleshooting information.
3. Remove hardware/software condition causing fault.
4. Clear Status File S:1/13 major error bits, if set.
5. Clear Status File S:5 minor error bits, if set.
6. Clear Status File S:6 major error code (optional).
7. Attempt a processor Run mode entry.
If unsuccessful, repeat recommended action steps above.
The Following
Error Exists Probable Cause Recommended Action
System does
not operate per
ladder logic.
User Forced I/O
Disabling
Operation
1. Monitor program file online and identify forced I/O.
2. Disable appropriate forces and test system conditions
again.
Refer to either the Hand-Held Terminal User Manual
(Catalog Number 1747-NP002) or your programming
software user manual.
Refer to the following key to determine the status of
the LED indicators:
Indicates the LED is OFF.
Indicates the LED is ON.
➀The RUN LED on the SLC 5/01 processor is
actually labeled “PC RUN.” Also, the
SLC 5/01 processor does not have a COMM
LED.
Indicates the LED is FLASHING.
Status of LED does not matter.
POWER RUN
CPU FAULT
FORCED I/O
BATTERY LOW
COMM
If the LEDs indicate:➀
POWER RUN
CPU FAULT
FORCED I/O
BATTERY LOW
COMM
If the LEDs indicate:➀

10–8 Troubleshooting
Publication 1747-6.2
The Following
Error Exists Probable Cause Recommended Action
System does
not operate per
programmed
forces.
User Programmed
Forces are Not
Enabled
1. Monitor program file online and identify programmed
forces.
2. Enable appropriate forces and test system conditions
again. Once forces are enabled, the FORCED I/O LED
goes on steady.
Refer to either the Hand-Held Terminal User Manual
(Catalog Number 1747-NP002) or your programming
software user manual.
The Following
Error Exists Probable Cause Recommended Action
CPU Major
Error with Low
or No Battery
Back-up
Loss of RAM
during Power
Down Period
1. Verify battery is connected. See pages 6–1 and 9–4.
2. Replace the battery if you want RAM battery backup.
See page 9–4. If you want to back up RAM with the
capacitor in a SLC 5/01 (1747-L511), add or replace the
BATTERY LOW LED jumper.
3. Refer to processor major fault recommended action
steps.
Refer to either the Hand-Held Terminal User Manual
(Catalog Number 1747-NP002) or your programming
software user manual.
Refer to the following key to determine the status of
the LED indicators:
Indicates the LED is OFF.
Indicates the LED is ON.
➀The RUN LED on the SLC 5/01 processor is
actually labeled “PC RUN.” Also, the
SLC 5/01 processor does not have a COMM
LED.
Indicates the LED is FLASHING.
Status of LED does not matter.
POWER RUN
CPU FAULT
FORCED I/O
BATTERY LOW
COMM
If the LEDs indicate:➀
POWER RUN
CPU FAULT
FORCED I/O
BATTERY LOW
COMM
If the LEDs indicate:➀

10–9 Troubleshooting
Publication 1747-6.2
Identifying SLC 5/02 Processor Communication Errors
The Following
Error Exists Probable Cause Recommended Action
The SLC 5/02
processor is not
re
c
e
i
v
in
gd
ata.
DH-485
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 19200.)
b. node address (Processor default is 1.)
3. Try to increase the maximum node address. (Default
is 31.)
re
c
e
i
v
in
gd
ata.
No
communication
to the
programmer.
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.
Low or No Power
to Communication
Device
1. Verify proper power supply selection and backplane
loading. (1747-PIC and 1747-AIC draw power off the
backplane.)
2. Verify proper 120/240V power supply jumper selection.
See page 6–8.
Refer to the following key to determine the status of
the LED indicators:
Indicates the LED is OFF.
Indicates the LED is ON.
➀The RUN LED on the SLC 5/01 processor is
actually labeled “PC RUN.” Also, the
SLC 5/01 processor does not have a COMM
LED.
Indicates the LED is FLASHING.
Status of LED does not matter.
ÉÉ
ÉÉ
Indicates the LED is FLASHING or OFF.
POWER RUN
CPU FAULT
FORCED I/O
BATTERY LOW
ÉÉ
ÉÉ
COMM
If the LEDs indicate:➀

10–10 Troubleshooting
Publication 1747-6.2
The Following
Error Exists Probable Cause Recommended Action
The SLC 5/02
processor is
receiving data,
but is not
communicating
with the
programmer.
DH-485
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 19200.)
b. node address (Processor default is 1.)
3. Try to increase the maximum node address. (Default
is 31.)
The Following
Error Exists Probable Cause Recommended Action
A fatal error has
occurred.
Excessive noise or
a faulty SLC 5/02
processor.
1. Cycle power to obtain flashing CPU FAULT LED and
default program.
2. Examine the error code following the power cycle.
Take appropriate action.
3. Reload your program.
4. Contact your local Allen-Bradley representative if the
error persists.
Refer to the following key to determine the status of
the LED indicators:
Indicates the LED is OFF.
Indicates the LED is ON.
➀The RUN LED on the SLC 5/01 processor is
actually labeled “PC RUN.” Also, the
SLC 5/01 processor does not have a COMM
LED.
Indicates the LED is FLASHING.
Status of LED does not matter.
ÉÉ
ÉÉ
Indicates the LED is FLASHING or OFF.
POWER RUN
CPU FAULT
FORCED I/O
BATTERY LOW
ÉÉ
COMM
If the LEDs indicate:➀
POWER RUN
CPU FAULT
FORCED I/O
BATTERY LOW
COMM
If the LEDs indicate:➀

10–1 1Troubleshooting
Publication 1747-6.2
Between the time you apply power to an SLC 5/03, SLC 5/04, or
SLC 5/05 processor and the communications are established via a
connected programming device, the only form of communication
between you and the processor is through the LED display.
When power is applied, all of the LEDs flash on and then off while
the processor conducts hardware tests. This is part of the normal
powerup sequence. Following the selftest by the processor, all the
LEDs again flash on momentarily. If a user program is in a running
state, the RUN LED will be on. If a fault exists within the processor,
the FLT LED is on.
To receive the maximum benefit of this troubleshooting section, we
recommend you follow these steps:
1. Identify the status of your processor LEDs. See chapter 5 for
description of LEDs and their different states.
2. Using the tables on the following pages, match your processor
and power supply LEDs with the status LEDs located in the first
column.
3. Once the status LEDs are matched to the appropriate table,
simply move across the table identifying error description and
probable causes.
4. Then follow the recommended action steps for each probable
cause until the cause is identified.
5. If recommended actions do not identify the trouble cause, contact
your local Allen-Bradley sales office or distributor.
Clearing SLC 5/03, SLC 5/04, and SLC 5/05 Processor Faults
Using the Keyswitch
Toggle the keyswitch from RUN to PROG and then back to RUN;
this clears the fault. If the keyswitch is left in the RUN position, the
processor mode cannot be changed from a programmer/operator
interface device. If you return the keyswitch to the REM position,
you can then use a programmer/operator interface device to change
the processor mode.
!ATTENTION: If you clear a processor fault using the
keyswitch, the processor immediately enters the Run
mode.
Troubleshooting the
SLC 5/03, SLC 5/04, and
SLC 5/05 Processors

10–12 Troubleshooting
Publication 1747-6.2
Identifying SLC 5/03, SLC 5/04, and SLC 5/05 Processor Errors
The following LEDs and tables provide you with information
regarding error messages, possible cause(s) for the error, and
recommended action to take to resolve the error.
The Following
Error Exists Probable Cause Recommended Action
No Line Power
1. Verify proper line voltage and connections on the
power terminals.
2. Verify proper 120/240V power supply jumper
selection. See page 6–8.
Power Supply
Fuse Blown
1. Check the incoming power fuse, check for proper
incoming power connections. Replace fuse.
2. If fuse blows again, replace the power supply. See
page 9–8 on fuse replacement.
Inadequate
System Power Power Supply
Overloaded
1. Remove line power to power supply. Remove
several output modules from the chassis. Wait five
minutes. Reapply power.
2. If condition reoccurs, re-calculate module
configuration power required and verify proper power
supply selection. See page 2–11.
This problem can occur intermittently if power supply is
overloaded when output loading and temperature
varies.
Defective Power
Supply
1. Recheck other probable causes.
2. Monitor the line power to chassis power supply for
possible transient or shorting.
3. Replace the power supply.
The Following
Error Exists Probable Cause Recommended Action
Inadequate
System Power
Improper Line
Power Voltage
Selection
Verify proper 120/240V power supply jumper selection.
See page 6–8.
Refer to the following key to determine the status of
the LED indicators:
Indicates the LED is OFF.
Indicates the LED is ON.
➀The 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.
POWER RUN
FLT
BATT
FORCE
DH485
RS232
If the LEDs indicate:➀
POWER RUN
FLT
BATT
FORCE
DH485
RS232
If the LEDs indicate:➀