Omron C28K Manuel D’Utilisation

Special I/O Units are dedicated Units that are designed to meet specific
needs. These include Analog Timer Units and Analog I/O Units.

Link Units are used to create Link Systems that link more than one PC or
link a single PC to remote I/O points. Link Units include I/O Link Units that
are used to connect K-type PCs to Remote I/O Systems controlled by a larg-
er PC (e.g. C1000H) and Host Link Units.

Other product groups include Programming Devices and Peripheral De-
vices.

The following are the basic steps involved in programming and operating a
K-type PC. Assuming you have already purchased one or more of these
PCs, you must have a reasonable idea of the required information for steps
one and two, which are discussed briefly below. This manual is written to ex-
plain steps three through six, eight, and nine. The section(s) of this manual
that provide relevant information are listed with each of these steps.

1, 2, 3... 1.

Determine what the controlled system must do, in what order, and at
what times.

2.

Determine what Units will be required. Refer to the 

Installation Guide. If

a Link System is required, refer to the required 

System Manual(s).

3.

On paper, assign all input and output devices to I/O points on Units and
determine which I/O bits will be allocated to each. If the PC includes
Special I/O Units or Link Systems, refer to the individual 

Operation

Manuals or System Manuals for details on I/O bit allocation. (Section 3
Memory Areas)

4.

Using relay ladder symbols, write a program that represents the se-
quence of required operations and their inter-relationships. Be sure to
also program appropriate responses for all possible emergency situ-
ations. (

Section 4 Writing and Inputting the Program, Section 5 Instruc-

tion Set, and Section 6 Program Execution Timing)

5.

Input the program and all required operating parameters into the PC.
(

6.

Debug the program, first to eliminate any syntax errors and then to elim-
inate execution errors. (

Section 7 Program Debugging and Execution, and Section 8
Troubleshooting)

7.

Wire the PC to the controlled system. This step can actually be started
as soon as step 3 has been completed. Refer to the 

Installation Guide

and to 

Operation Manuals and System Manuals for details on individual

Units.

8.

Test the program in an actual control situation and fine tune it if required.
(

Section 7 Program Debugging and Execution and Section 8

9. 

Record two copies of the finished program on masters and store them
safely in different locations. (

Designing the Control System is the first step in automating any process. A
PC can be programmed and operated only after the overall Control System is
fully understood. Designing the Control System requires a thorough under-
standing of the system that is to be controlled. The first step in designing a
Control System is thus determining the requirements of the controlled sys-
tem.