PLC Programming manual

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PLC Programming manual

Introduction

PLC Programming manual

  This manual describes programming of the CQM1, CPM1, CPM1A, and SRM1 Programmable Controllers, including memory structure, memory contents, ladder-diagram instructions, etc., and includes the sections described below. Refer to the CQM1 Operation Manual, CPM1 Operation Manual, CPM1A Operation Manual, and SRM1 Master Control Units Operation Manual for hardware information and Programming Console operating procedures. Refer to the SSS Operation Manual: C-series PCs for SSS operating procedures.

    The SRM1 is a specialized programmable controller and is normally called a CompoBus/S Master Control Unit. The SRM1, however, is programmed in the same way as the other Programmable Controllers and it is treated and referred to as a PC in this manual.

Handbook of SCADA/Control Systems Security

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Table Of Contents

Section 1 explains the PC Setup and related PC functions, including interrupt processing and communications. The PC Setup can be used to control the operating parameters of the PC.

Section 2 provides an introduction to new PC features, including the new instructions available through expansion instructions and a new monitoring feature call differential monitoring.

Section 3 describes the structure of the PC’s memory areas, and explains how to use them. It also describes Memory Cassette operations used to transfer data between the CQM1 and a Memory Cassette.

Section 4 explains the basic steps and concepts involved in writing a basic ladder diagram program. It introduces the instructions that are used to build the basic structure of the ladder diagram and control its execution.

Section 5 individually describes the ladder-diagram programming instructions that can be used with the PC.

Section 6 explains the methods and procedures for using host link commands, which can be used for host link communications via the PC ports.

Section 7 explains the internal processing of the PCs, and the time required for processing and execution. Refer to this section to gain an understanding of the precise timing of PC operation.

Section 8 describes how to diagnose and correct the hardware and software errors that can occur during PC operation.

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