Mitsubishi Electric NZ2GFSS2 32D S1 User Manual page 4

[Design Precautions]
WARNING
● When the safety remote I/O module detects an error in a module power supply or an external power
supply (IO power), or a failure in the module, it turns off the 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 due to an incorrect output or malfunction.
● When a load current exceeding the rated current or an overcurrent caused by a load short-circuit
flows, the safety remote I/O module defines it as a fault and turns off the 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.
● At the start-up of the system, if a short-circuit has occurred at the output wiring of the external power
supply (IO power), a load may turn on just after the power-on. Configure an interlock circuit to ensure
that the entire system will always operate safely.
● When a communication failure occurs in the network, the failed station becomes the following status.
Check the communication status information and configure an interlock circuit in the program to
ensure that the entire system will operate safely. Failure to do so may result in an accident due to an
incorrect output or malfunction.
(1) All inputs from remote I/O stations are turned off.
(2) All outputs from remote I/O stations are turned off.
● Do not read or write any data from/to the "use prohibited" areas in the remote register. If data is read
or written from/to the remote register, correct operation of the module cannot be guaranteed.
● To satisfy SIL3, Category 4 PL e, use input devices with normally closed contacts. Inputs using the
devices with normally open contacts do not satisfy SIL3, Category 4 PL e.
● Use a SELV power supply for the devices to be connected to the input part of the safety remote I/O
module. If not, SIL3, Category 4 PL e is not satisfied.
● When "Operation setting of external power supply voltage error detection" is set to "Continue safety
communication (Without output interlock)", configure an external interlock circuit for the safety outputs
to prevent unintended restart.
2