Application Precautions - Omron CJ - REFERENCE MANUAL 07-2009 Reference Manual

Application Precautions

5 Application Precautions
!WARNING
!Caution Failure to abide by the following precautions could lead to faulty operation of
Observe the following precautions when using the PLC System.
• You must use the CX-Programmer (programming software that runs on
Windows) if you need to program more than one task. A Programming
Console can be used to program only one cyclic task plus interrupt tasks.
A Programming Console can, however, be used to edit multitask pro-
grams originally created with the CX-Programmer.
Always heed these precautions. Failure to abide by the following precautions
could lead to serious or possibly fatal injury.
• Always connect to a class-3 ground (to 100 Ω or less) when installing the
Units. Not connecting to a class-3 ground may result in electric shock.
• A class-3 ground (to 100 Ω or less) must be installed when connecting the
GR and LG terminals on the Power Supply Unit.
• Always turn OFF the power supply to the PLC before attempting any of
the following. Not turning OFF the power supply may result in malfunction
or electric shock.
• Mounting or dismounting Power Supply Units, I/O Units, CPU Units, In-
ner Boards, or any other Units.
• Assembling the Units.
• Setting DIP switches or rotary switches.
• Connecting cables or wiring the system.
• Connecting or disconnecting the connectors.
the PLC or the system, or could damage the PLC or PLC Units. Always heed
these precautions.
• The user program and parameter area data in the CS1-H, CS1D, CJ1-H,
and CJ1M CPU Units are backed up in the built-in flash memory. The
BKUP indicator will light on the front of the CPU Unit when the backup
operation is in progress. Do not turn OFF the power supply to the CPU
Unit when the BKUP indicator is lit. The data will not be backed up if
power is turned OFF.
• When using a CS-series CS1 CPU Unit for the first time, install the
CS1W-BAT01 Battery provided with the Unit and clear all memory areas
from a Programming Device before starting to program. (Not required for
CS1-H, CJ1, CJ1-H, CJ1M, or CS1D CPU Units.)
• When using the internal clock for a CS-series CS1 CPU Unit, turn ON
power after installing the battery and set the clock from a Programming
Device or using the DATE(735) instruction. The clock will not start until the
time has been set. (Not required for CS1-H, CJ1, CJ1-H, CJ1M, or CS1D
CPU Units.)
• When using a CS1-H, CJ1, CJ1-H, CJ1M, or CS1D CPU Unit, the PLC
Setup is set to specify using the mode set on the Programming Console,
and a Programming Console is not connected, the CPU Unit will start in
RUN mode. This is the default setting in the PLC Setup. A CS1 CPU Unit
will start in PROGRAM mode under the same conditions.
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