Omron Sysmac CJ Series, Operation Manual

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xvii
Operating Environment Precautions 4
measure for such problems, external safety measures must be provided
to ensure safety in the system.
• When the 24-V DC output (service power supply to the PLC) is over-
loaded or short-circuited, the voltage may drop and result in the outputs
being turned OFF. As a countermeasure for such problems, external
safety measures must be provided to ensure safety in the system.
!Caution Confirm safety before transferring data files stored in the file memory (Mem-
ory Card or EM file memory) to the I/O area (CIO) of the CPU Unit using a
Programming Device. Otherwise, the devices connected to the output unit
may malfunction regardless of the operation mode of the CPU Unit.
!Caution Execute online edit only after confirming that no adverse effects will be
caused by extending the cycle time. Otherwise, the input signals may not be
readable.
!Caution Do not touch the Power Supply Unit while power is being supplied or immedi-
ately after power is turned OFF. Doing so may result in electric shock.
!Caution Confirm safety at the destination node before transferring a program to
another node or changing contents of the I/O memory area. Doing either of
these without confirming safety may result in injury.
!Caution
Tighten the screws on the terminal block of the AC Power Supply Unit to the
torque specified in the operation manual. The loose screws may result in
burning or malfunction.
!Caution To provide for safe operation even in the event that the Temperature Control
Unit malfunctions, provide safety measures to prevent abnormal temperature
rise in a separate system outside the PLC system. If proper safety measures
are not taken, serious accidents could result from Unit failure resulting in loss
of control.
!Caution At least approximately 4 seconds are required for control or heater burnout
outputs to be made from the Temperature Control Unit after power is turned
ON to the PLC. When using the Temperature Control Unit in an external
sequence circuit, allow for this time delay in the system design.
!Caution
Do not turn OFF the power supply while data is being written to the EEPROM
in the Temperature Control Unit. Confirm that the Save Completed Flag turns
ON after the data write operation has been completed before turning OFF the
power supply. If power is turned OFF during a write operation, the data saved
in the EEPROM may be destroyed.
4 Operating Environment Precautions
!Caution Do not operate the control system in the following locations:
• Locations subject to direct sunlight.
• Locations subject to temperatures or humidity outside the range specified
in the specifications.