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5
9. Wire the PC to the controlled system. This step can actually be started as
soon as step 3 has been completed. Refer to the CV-series PCs Installation
Guide and to other Operation Manuals and System Manuals for details on
individual Units.
10. Test the program in an actual control situation and carry out fine tuning as
required. Refer to the SSS operation manuals for details on debugging op-
erations. (Refer to Section 6 Troubleshooting in the CVM1D PC Installation
Guide.)
11. Record two copies of the finished program on masters and store them safely
in different locations. Refer to the SSS operation manuals for details.
Note
1. The date and time are not set when the CPU is shipped. Set the date and
time by the procedure described in the SSS Operation Manuals.
2. There is an error log in the PC. This log can be cleared by turning ON the
Error Log Reset Bit (A00014).
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.
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 signal
from the PC. Keep in mind that the number of I/O points available depends on
the configuration of the PC.
Next, determine the sequence in which control operations are to occur and the
relative timing of the operations. Identify the physical relationships between 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 photoelectric switch.
Each of the related tasks must be similarly determined, from the beginning of the
control operation to the end.
Unit Requirements
The actual Units that will be mounted or connected to PC Racks must be deter-
mined according to the requirements of the I/O devices. Actual hardware specifi-
cations, such as voltage and current levels, as well as functional considerations,
such as those that require Special I/O Units, CPU Bus Units, or Link Systems will
need to be considered. In many cases, Special I/O Units, CPU Bus Units or Link
Systems can greatly reduce the programming burden. Details on these Units
and Link Systems are available in appropriate Operation Manuals and System
Manuals.
Once the entire Control System has been designed, the task of programming,
debugging, and operation as described in the remaining sections of this manual
can begin.
1-6
PC Operating Modes
1-6-1 Operating Modes
CVM1D PCs have four operation modes: PROGRAM, DEBUG, MONITOR, and
RUN. The Unit will automatically enter the mode specified in the PC Setup (de-
fault setting: PROGRAM mode). Refer to Section 7 PC Setup for details. The PC
mode can be changed from a Programming Device. The function of each mode
is described briefly below.
Sequence, Timing, and
Relationships
PC Operating Modes
Section 1-6
Summary of Contents for CVM1D
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