Safety Precautions - Mitsubishi Electric NZ2FTGN User Manual

SAFETY PRECAUTIONS

(Read these precautions before using this product.)
Before using this product, please read this manual and the relevant manuals carefully and pay full attention to safety to handle
the product correctly.
The precautions given in this manual are concerned with this product only. For the safety precautions of the programmable
controller system, refer to the user's manual for the CPU module used.
In this manual, the safety precautions are classified into two levels: "
WARNING
CAUTION
Under some circumstances, failure to observe the precautions given under "
consequences.
Observe the precautions of both levels because they are important for personal and system safety.
Make sure that the end users read this manual and then keep the manual in a safe place for future reference.
[Design Precautions]
WARNING
● When a communication failure occurs in the network, data in the master module are held. Check the
signals indicating the data link status of each station and configure an interlock circuit in the program
to ensure that the entire system will operate safely.
● Outputs may remain on or off due to a failure of the module. Configure an external circuit for
monitoring output signals that could cause a serious accident.
[Design Precautions]
CAUTION
● Do not install the control lines or communication cables together with the main circuit lines or power
cables. Keep a distance of 100mm or more between them. Failure to do so may result in malfunction
due to noise.
● During control of an inductive load such as a lamp, heater, or solenoid valve, a large current
(approximately ten times greater than normal) may flow when the output is turned from off to on.
Therefore, use a module that has a sufficient current rating.
● The main switch, the switches of the subsequent circuits, the cable cross sections and the fuse
protection have to be configured according to IEC 61010. The current demand must be calculated
separately for each slave station.
● In the case of modules without fused external devices, all cables to the connected devices must be
fused corresponding to their conductor cross-section (DIN VDE 0298 Part 4).
● To meet UL-specifications in accordance with UL 248-14, a UL-certified automatic fuse (e.g. ABB
Type S201-B16) or a 10A fuse with a medium time-lag (e.g. ESKA Part No.522.227) must be used.
● All connections of the slave stations are protected against voltage pulses and overcurrent in
accordance with IEC 61131-2, Zone B. The operator has to decide whether additional overvoltage
protection according to IEC 62305 is required. Voltages that exceed 30V may cause the destruction
of couplers and I/O modules.
2
Indicates that incorrect handling may cause hazardous conditions, resulting in
death or severe injury.
Indicates that incorrect handling may cause hazardous conditions, resulting in
minor or moderate injury or property damage.
WARNING" and " CAUTION".
CAUTION" may lead to serious