3
[Design Precautions]
WARNING
●
If a communication cable is disconnected, the network may be unstable, resulting in a communication
failure of multiple stations. Configure an interlock circuit in the program to ensure that the entire
system will always operate safely even if communications fail. Incorrect output or malfunction due to a
communication failure may result in an accident. When safety communications are used, an interlock
by the safety station interlock function protects the system from an incorrect output or malfunction.
[Precaution for using the I/O module with diagnostic functions in normal mode]
●
Configure a circuit so that the programmable controller is turned on first and then the external power
supply. If the external power supply is turned on first, an accident may occur due to an incorrect output
or malfunction.
[Precautions for using the I/O module with diagnostic functions in SIL2 mode]
●
When the I/O module with diagnostic functions detects a fault in the external power supply or
programmable controller, it turns off outputs. Configure an external circuit to ensure that the power
source of a hazard is shut off by turning off the outputs. Failure to do so may result in an accident.
●
When a load current exceeding the rated current or an overcurrent caused by a load short-circuit
flows, the output module with diagnostic functions detects an error and turns off all outputs. Note that
if the overcurrent state continues for a long time, it may cause smoke and fire. To prevent this,
configure an external safety circuit, such as a fuse.
●
Configure protection circuits, such as a fuse and breaker, external to the output module with
diagnostic functions.
●
When a communication failure occurs with CC-Link IE Field Network, the I/O module with diagnostic
functions turns off outputs. However, the program does not automatically turn off outputs. Create a
program that turns off outputs when a CC-Link IE Field Network error is detected. If CC-Link IE Field
Network is restored with outputs on, connected machines may suddenly operate, resulting in an
accident.
●
Create an interlock circuit which uses reset buttons so that the system does not restart automatically
after executing safety functions and turning off outputs.
Содержание MELSEC iQ-RX40NC6B
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