Allen-Bradley PLC-5 User Manual

Publication 1785-UM012D-EN-P - July 2005
Preparing Power-Up Routines 14-3
To set and reset bits:
1. Cursor to the bit location.
2. Set by entering 1; reset the bit by entering 0.
The above table describes the possible start-up routines. For more information
about fault routines, see chapter 16.
See chapter 21 for definitions of the user control bits (S:26/0-6).
Possible Controller Power-Up Routines
Use this Bit To
0 Control controllers that are using SFCs
This bit determines if the SFC restarts or resumes at the last active
step after a power loss.
1 Select power-loss protection
If this bit is set and a power loss occurs, the controller sets major
fault bit 5 and executes a fault routine you define before it returns to
normal program scan.
If You are With And You Want to: Then Set Bit 0 and 1 as Shown:
15..............0
Using SFCs No fault routine Restart at the first step xxxxxxxx xxxxxx00
Restart at the last active step xxxxxxxx xxxxxx01
Not using SFCs Fault routine Start at the first file xxxxxxxx xxxxxx0x
Restart using the fault routine file xxxxxxxx xxxxxx1x
Using a fault file SFCs Restart using the fault file and then the first step xxxxxxxx xxxxxx10
Restart using the fault file and then the last active step xxxxxxxx xxxxxx11
Not using a fault file Not using SFCs Start at the first file in the controller’s memory. xxxxxxxx xxxxxx00
Each x indicates a bit that can be 0 or 1 for the status value described.

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.