4
High-density
I/O Units
are designed to provide high-density I/O capability and
include
Group 2 High-density I/O Units and Special I/O High-density I/O
Units.
Special
I/O Units
are dedicated Units
that are designed to meet specific needs.
These
include some of the
High-density I/O Units, Position Control Units, High-
speed Counter 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 Remote I/O Units, PC Link
Units, Host Link Units, SYSMAC NET Link Units, and SYSMAC LINK Units.
SYSMAC
NET Link and SYSMAC LINK Units can be used with the CPU1
1 only
.
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
C200HS.
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
C200HS
Installation
Guide
. If a Link System is required,
refer to the appropriate
Sys-
tem Manual.
3. On
paper
, assign all input and output devices to I/O points on Units and de
-
termine
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 sequence
of
required operations and their inter-relationships. Be sure to also
program
appropriate responses for all possible emergency situations. (Section 4
Writing
and Inputting the Program, Section
5 Instruction Set, Section
6 Pro
-
gram Execution Timing)
5. Input
the program and all required operating
parameters into the PC. (
Sec-
tion 4-7 Inputting, Modifying, and Checking the Program.)
6. Debug
the program, first to eliminate any syntax errors, and then to find ex
-
ecution errors. (Section 4-7 Inputting, Modifying, and Checking the Pro-
gram, Section 7 Program Monitoring and Execution, and Section 10
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
C200HS 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. (Section 7 Program Monitoring and Execution and Section 10
Troubleshooting)
9. Record
two copies of the finished program on masters and store them safely
in different locations. (Section 4-7 Inputting, Modifying, and Checking the
Program)
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 thorough un-
derstanding of the system that is to be controlled. The first step in designing a
Control
System is thus determining the requirements of the controlled system.
Overview of PC Operation Section 1-5
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