Allen-Bradley PLC-5 User Manual

Publication 1785-UM012D-EN-P - July 2005
15-12 Preparing Fault Routines
Monitoring Major/Minor Faults and Fault Codes
When a fault occurs, the controller status screen in your programming
software displays program file and rung number indicators that point to where
the fault occurred.
Interpreting Major Faults
For a description of the major faults (S:11), see Appendix B.
Interpreting Minor Faults
Displaying a Description of the Major Faults Clear the Faults by
• The status text that appears corresponds to the most
significant fault when the cursor is not on the major fault
status word.
• If the cursor is on a major fault word bit and that bit is set,
the status text that appears corresponds to the bit that the
cursor is on.
• If no bits are set, the message area is blank.
• Using the clear major-fault-function on the controller status
screen of your programming software. When you clear major
faults, the fault code, program file, and rung number fields
are also cleared.
• Resetting individual bits. If you have more than one major
fault and you reset a bit, the status text displays the next
major fault message.
Displaying a Description of the Minor Faults Clear the Faults by
• The status text that appears corresponds to the most
significant fault when the cursor is not on the minor fault
status words.
• If the cursor is on a minor fault word bit and that bit is set,
the status text that appears corresponds to the bit that the
cursor is on.
• If no bits are set the message area is blank.
• Using the clear minor-fault-function on the controller status
screen of your programming software.
• Resetting individual bits. If you have more than one minor
fault and you reset a bit, the status text displays the next
minor fault message.

Allen-Bradley PLC-5 Specifications

General

Programming Software	RSLogix 5
Programming Languages	Ladder Logic
Power Supply	120/240V AC or 24V DC
Communication Ports	DH+, Remote I/O, Ethernet/IP, ControlNet
Operating Temperature	0 to 60°C (32 to 140°F)
Relative Humidity	5 to 95% non-condensing
Memory	Up to 64K words (user program and data)

Summary

Preface

Manual Overview

Outlines the manual's three main sections: Design, Operate, and Maintain.

Chapter 1 Understanding Your Programmable Controller

Lay Out the System

Guides on determining network configuration and component placement for PLC-5 systems.

Programming Features

Highlights the programming features of a PLC-5 controller, including ladder logic and SFCs.

Chapter 2 Selecting and Placing I/O

Selecting I/O Modules

Guides on selecting I/O modules to interface with machines and processes.

Chapter 3 Placing System Hardware

Determining the Proper Environment

Details acceptable environmental conditions for controller placement.

Grounding Your System

Provides information on proper grounding guidelines for system hardware.

Chapter 4 Addressing I/O and Controller Memory

I/O Addressing Concept

Explains how controller memory segments are used to address I/O terminals.

Assigning Racks

Details how chassis size and addressing mode determine the number of I/O racks.

Chapter 6 Communicating with Remote I/O

Designing a Remote I/O Link

Outlines steps and guidelines for designing a remote I/O link.

Chapter 8 Communicating with Extended-Local I/O

Configuring the Controller as an Extended-Local I/O Scanner

Guides on configuring channel 2 for extended-local I/O as a scanner.

Chapter 10 Communicating with Devices on a Serial Link

Configuring Channel 0

Explains how to configure channel 0 for DF1 point-to-point, master, slave, or user mode.

Chapter 11 Communicating with Devices on an Ethernet Network

Configuring Channel 2 for Ethernet Communication

Guides on configuring channel 2 for Ethernet communication using manual or BOOTP methods.

Using Advanced Ethernet Functions

Explains advanced functions like broadcast address, subnet masks, and gateways.

Chapter 12 Protecting Your Programs

Passwords and Privileges

Explains how passwords and privileges restrict access to controller files and functions.

Chapter 13 Programming Considerations

Forcing

Explains how to turn input/output bits on/off for testing purposes.

Extended Forcing

Describes how to force discrete I/O, analog I/O, and block-transfer data words.

Chapter 15 Preparing Fault Routines

Understanding the Fault Routine Concept

Explains how fault routines execute when a major fault is encountered.

Monitoring Faults

Describes how to monitor controller faults using the status screen.

Appendix F Troubleshooting

PLC-5 controller

Lists general problems for PLC-5 controllers, probable causes, and recommended actions.

Extended-Local I/O system

Offers troubleshooting guidance for the 1771-ALX adapter module.

Appendix G Cable Reference

Channel 0 Pin Assignments

Shows pin assignments for channel 0 (RS-port) for different serial communication modes.

Ethernet Cable Connections

Describes Ethernet cable connections and transceiver specifications.