About This Manual - Omron SYSMAC C20P Operation Manual

About this Manual:

The OMRON P-type Programmable Controllers offer an effective way to automate processing. man-
ufacturing, assembly, packaging, and many other processes can be automated to save time and
money. Distributed control systems can also be designed to allow centralized monitoring and supervi-
sion of several separate controlled systems. Monitoring and supervising can be done through a host
computer, connecting the controlled system to a data bank. It is thus possible to have adjustments in
system operation made automatically to compensate for requirement changes.
The P-type Units can utilize a number of additional Units including dedicated Special I/O Units that
can be used for specific tacks and Link Units that can be used to build more highly integrated sys-
tems.
The P-types are equipped with large programming instruction sets, data areas, and other features to
control processing directly. Programming utilizes ladder-diagram programming methods, which are
described in detail for those unfamiliar with them.
This manual describes the characteristics and abilities of the P-types, programming operations and
instructions, and other aspects of operation and preparation that demand attention. Before attempting
to operate the PC, thoroughly familiarize yourself with the information contained herein. Hardware
information is provided in detail in the Installation Guide . A table of other manuals that can be used in
combination with this manual is provided at the end of Section 1 Background .
Section 1 Precautions provides general precautions for using the Programmable Controller (PC).
The information contained in this section is important for the safe and reliable application of
the PC. You must read this section and understand the information contained before attempt-
ing to set up or operate a PC system.
Section 2 Background explains the background and some of the basic terms used in ladder-diagram
programming. It also provides an overview of the process of programming and operating a PC and
explains basic terminology used with OMRON PCs. Descriptions of peripheral devices used with the
P-types and a table of other manuals available to use with this manual for special PC applications are
also provided.
Section 3 Hardware Considerations explains basic aspects of the overall PC configuration and de-
scribes the indicators that are referred to in other sections of this manual.
Section 4 Memory Areas takes a look at the way memory is divided and allocated and explains the
information provided there to aid in programming. It also explains how I/O is managed in memory and
how bits in memory correspond to specific I/O points.
Section 5 Programming explains the basics of ladder-diagram programming, looking at the ele-
ments that make up the 'ladder' part of a ladder-diagram program and explaining how execution of
this program is controlled.
S ection 6 Instruction Set then goes on to describe individually all of the instructions used in pro-
gramming.
Section 7 Program Execution Timing explains the scanning process used to execute the program
and tells how to coordinate inputs and outputs so that they occur at the proper times.
Section 8 Program Input, Debugging, and Execution explains how to convert a ladder diagram
into mnemonic code so that it can be input into the CPU through a Programming Console. This sec-
tion also provides the Programming Console procedures used to input and debug the program and to
monitor and control system operation.
Section 9 Troubleshooting provides information on system error indications and other means of re-
ducing system down time. Information in this section is also necessary when debugging a program.
The Appendice s provide tables of standard OMRON products available for the P-types, reference
tables of instructions and Programming Console operations, and other information helpful in PC op-
eration.
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