Overview Of Pc Operation - Omron SYSMAC CVM1 Series Operation Manual

Overview of PC Operation

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Overview of PC Operation

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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.
CPU Bus Units connect to the CPU bus and must be mounted on either the
CPU Rack or an Expansion CPU Rack. These include the SYSMAC NET Link
Unit, SYSMAC LINK Unit, SYSMAC BUS/2 Remote I/O Master Unit, and BASIC
Unit.
Link Units are used to create communications links between PCs or between
PCs and other devices. Link Units include SYSMAC NET Link Unit, SYSMAC
LINK Unit, and, sometimes, SYSMAC BUS/2 Remote I/O Master Unit.
Other product groups include Programming Devices, Programming De-
vices, and DIN Track Products.
The following are the basic steps involved in programming and operating a CV-
series 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. The relevant sections of this manual that
provide more information are listed with relevant steps.
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 CVM1D
PC 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 de-
termine which I/O bits will be allocated to each. If the PC includes Special I/O
Units, CPU Bus 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 within each process and their inter-relationships. Be
sure to also program appropriate responses for all possible emergency situ-
ations. (Section 4 Writing Programs, Section 5 Instruction Set, Section 6
Program Execution Timing)
5. Write the program in the SSS offline, and then switch to online operation and
transfer the program to Program Memory in the CPU. The program can also
be written or altered online. Refer to the SSS Operation Manual for details.
6. Generate the I/O table with I/O Units installed. The I/O table can be gener-
ated either online from the SSS, or edited offline and then transferred. Al-
ways turn the PC off and on after transferring the I/O table. The PC will not
run until the I/O table has been registered. Refer to the SSS Operation
Manual for details.
7. The PC Setup controls a variety of basic options in PC operation (such as
the PC mode at start-up). The operating parameters in the PC Setup can be
left in their default settings or changed with the SSS as required. Refer to
Section 7 PC Setup for details.
8. Debug the program, first to eliminate any syntax errors, and then to find
execution errors. Refer to the SSS operation manuals for details on debug-
ging operations. (Refer to Section 6 Troubleshooting in the CVM1D PC
Installation Guide.)
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