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4
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
OMRON Product Terminology
OMRON products are divided into several functional groups that have ge-
neric names. A
ppendix A
Standard Models
list products according to these
groups. The term
Unit
is used to refer to all of the OMRON PC products. Al-
though a Unit is any one of the building blocks that goes together to form a
C1000H or C2000H PC, its meaning is generally, but not always, limited in
context to refer to the Units that are mounted to a Rack. Most, but not all, of
these products have names that end with the word Unit.
The largest group of OMRON products is the
I/O Units
. These include all of
the Rack-mounting Units that provide non-dedicated input or output points for
general use. I/O Units come with a variety of point connections and specifica-
tions.
Special I/O Units
are dedicated Units that are designed to meet specific
needs. These include Position Control Units, High-speed Counter Units, and
Analog I/O Units. This group also includes some programmable Units, such
as the ASCII Unit, which is programmed in BASIC.
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 Remote I/O Units, PC
Link Units, SYSMAC NET Link Units, and Host Link Units.
Other 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
C1000H or C2000H. 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 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 Racks and what Units will be required. Refer to the
C1000H/C2000H Installation Guide
. If a Link System is required, refer to
the appropriate
System Manual
.
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, Section 6 Program Execution Timing)
5.
Input the program and all required operating parameters into the PC.
(
Section 7 Program Input, Debugging, and Execution
)
6.
Debug the program, first to eliminate any syntax errors, and then to find
execution errors. (
Section 7 Program Input, Debugging, and Execution
and
Section 8 Troubleshooting
)
Overview of PC Operation
Section 1-5