Application Precautions - Omron CS1D DUPLEX SYSTEM - 10-2009 Operation Manual

Application Precautions

!Caution The operating environment of the PLC System can have a large effect on the
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Application Precautions

longevity and reliability of the system. Improper operating environments can
lead to malfunction, failure, and other unforeseeable problems with the PLC
System. Be sure that the operating environment is within the specified condi-
tions at installation and remains within the specified conditions during the life
of the system.
Observe the following precautions when using the PLC System.
• Do not use the C200H/CS-series Power Supply Units (C200H-P@@@@)
in a CS1D PLC. System operation will not be dependable and may stop.
• Do not use a CS1D Power Supply Unit (CS1D-PA/PD@@@) for any PLC
other than a CS1D PLC. Operational errors and burning will result.
• If duplex Power Supply Units are to be used, calculate the current con-
sumption so that the system will be able to operate with a single Power
Supply Unit in case an error occurs in the other Power Supply Unit. If two
different kinds of Power Supply Units are to be used, calculate the current
consumption using the output of the smaller-capacity Power Supply Unit.
• In a CS1D Duplex CPU System, always mount the CS1D-CPU@@H/P
CPU Units for Duplex CPU Systems to the CS1D-BC052/BC042D CPU
Backplane. Faulty operation will occur if any other CPU Unit is mounted.
• In a CS1D Single CPU System, always mount a CS1D-CPU@@S CPU
Unit for Single CPU Systems to the CS1D-BC82S CPU Backplane. Faulty
operation will occur if any other CPU Unit is mounted.
• Do not mount a CS1D-CPU@@H/P/S CPU Unit to a CS1W-BC@@ (non-
CS1D) CPU Backplane. Otherwise, faulty operation will occur.
• The cycle time will be increased over the normal cycle time whenever
duplex operation is initialized, including when power is turned ON, when
the initialization button is pressed, when operation is started, and when
data is transferred. The increase will be a maximum of 190 ms for the
CS1D-CPU65H and 520 ms for the CS1D-CPU67H. Set the monitoring
time (10 to 40,000 ms, default: 1 s) for the cycle time high enough to allow
for this increase. Also, confirm that the system will operate correctly and
safely even for the maximum cycle time, including the increase for duplex
initialization.
• If operation switches from Duplex Mode to Simplex Mode, processing to
synchronize the active and standby CPU Units will no longer be per-
formed, resulting in a shorter cycle time. The more instructions requiring
synchronization (such as IORF, DLNK, IORD, IOWR, PID, RXD, FREAD,
and FWRIT) are used, the greater the difference between Duplex Mode
and Simplex Mode operation will be (with Duplex Mode having the longer
cycle time). Confirm that the system will operate correctly and safely even
for the cycle time in both Simplex and Duplex Modes.
• If the active CPU Unit is switched when PTs or host computers are con-
nected to the RS-232C port on both the active and standby CPU Units,
communications may be interrupted momentarily. Always enable retry
process in communications programs at the PTs or host computers.
• Before replacing a Unit online, always disable the operation of all con-
nected external devices before starting the replacement procedure. Unex-
pected outputs from the Unit being replaced may result in unexpected
operation of controlled devices or systems.
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