Safety Precautions
12
CJ-series EtherCAT Slave Units Operation Manual (W541)
Warnings
WARNING
During Power Supply
Do not touch any of the terminals or terminal blocks while the power is being
supplied. Doing so may result in electric shock.
Do not attempt to take any Unit apart. In particular, high-voltage parts are
present in the Power Supply Unit while power is supplied or immediately
after power is turned OFF. Touching any of these parts may result in electric
shock. There are sharp parts inside the Unit that may cause injury.
Transferring
Always 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.
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.
Fail-safe Measures
Provide safety measures in external circuits (i.e., not in the Programmable
Controller), including the following items, to ensure safety in the system if an
abnormality occurs due to malfunction of the PLC or another external factor
affecting the PLC operation. Not doing so may result in serious accidents.
Unintended outputs may occur when an error occurs in memory used for
CJ-series Units. As a countermeasure for such problems, external safety
measures must be provided to ensure safe operation of the system.
Emergency stop circuits, interlock circuits, limit circuits, and similar safety
measures must be provided in external control circuits.
The PLC will turn OFF all outputs when its self-diagnosis function detects
any error or when a severe failure alarm (FALS) instruction is executed.
Unexpected operation, however, may still occur for errors in the I/O control
section, errors in I/O memory, and other errors that cannot be detected by
the self-diagnosis function. As a countermeasure for all such errors, external
safety measures must be provided to ensure safety in the system.
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