OMRON C60H-C5DR-DE-V1 Programmable Controllers
OMRON C60H-C5DR-DE-V1 Programmable Controllers
monitors the status of all input points and turns ON or OFF corresponding
input bits accordingly.
There are also output bits in memory that are allocated to output points on
Units through which output signals are sent to output devices, i.e., an output
bit is turned ON to send a signal to an output device through an output point.
The CPU periodically turns output points ON or OFF according to the status
of the output bits.
These terms are used when describing different aspects of PC operation.
When programming, one is concerned with what information is held in mem
ory, and so I/O bits are referred to. When talking about the Units that connect
the PC to the controlled system and the places on these Units where signal
enter and leave the PC, I/O points are referred to. When wiring these I/O
points, the physical counterparts of the I/O points, either terminals or connec
tor pins, are referred to. When talking about the signals that enter or leave
the PC, one refers to input signals and output signals, or sometimes just in
puts and outputs. It all depends on what aspect of PC operation is being
talked about.
Controlled System and
Control System
The Control System includes the PC and all I/O devices it uses to control an
external system. A sensor that provides information to achieve control is an
input device that is clearly part of the Control System. The controlled system
is the external system that is being controlled by the PC program through
these I/O devices. I/O devices can sometimes be considered part of the con
trolled system, e.g., a motor used to drive a conveyor belt.
1-4 OMRONProductTerminology
OMRONproducts are divided into several functional groups that have gener
ic names. Appendix A Standard Models list products according to these
groups. The term Unit is used to refer to all of the OMRON PC products.
Product groups include Programming Devices, Peripheral Devices, and DIN
Rail Products.
1-5 Overview of PC Operation
The following are the basic steps involved in programming and operating a
C20H-type PC. Assuming you have already purchased one or more of these
PCs, you would be familiar with steps one and two, which are discussed
briefly below. This manual is written to explain steps three through six, eight,
and nine. The relevant sections of this manual that provide more 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 and whether your system configu
ration will require an Expansion I/O Units. Refer to the Mini H-type PC
Installation Guide.
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.
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. (Refer to Section 4 Writing and Entering Programs, Section5In
struction Set, and Section 6 Program Execution Timing)
5. Input the program and all required operating parameters into the PC.
(Refer to Section 7 Program Debugging and Execution
6. Debug the program, first to eliminate any syntax errors, and then to find
execution errors. (Refer to Section 7 Program Debugging and Execution
and Section 9 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 C20H, C28H, C40H
Installation Guide and to Operation Manuals and System Manuals for
details on individual Units.
8. Test the program in an actual control situation and carry out fine tuning
as required. (Refer to Section 7 Program Debugging and Execution and
Section 9 Troubleshooting)
Control System Design
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, first of all, a thor
ough understanding of the system that is to be controlled. The first step in
designing a Control System is thus determining the requirements of the con
trolled system.
Input/Output Requirements The first thing that must be assessed is the number of input and output points
that the controlled system will require. This is done by identifying each device
that is to send an input signal to the PC or which is to receive an output sig
nal from the PC. Keep in mind that the number of I/O points available de
pends on the configuration of the PC. Refer to 3-3 IR Area for details on I/O
capacity and the allocation of I/O bits to I/O points.
Sequence, Timing, and
Relationships
Next, determine the sequence in which control operations are to occur and
the relative timing of the operations. Identify the physical relationships be
tween the I/O devices as well as the kinds of responses that should occur
between them.
For instance, a photoelectric switch might be functionally tied to a motor by
way of a counter within the PC. When the PC receives an input from a start
switch, it could start the motor. The PC could then stop the motor when the
counter has received a specified number of input signals from the photoelec
tric switch.
Each of the related tasks must be similarly determined, from the beginning of
the control operation to the end.
C60H-C5DR-DE-V1