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Precautions for Safe Use
Observe the following precautions when using the Digital Sensor Communications Unit:
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Power Supply
• Take appropriate measures to ensure that the specified power with the rated voltage
and frequency is supplied. Be particularly careful in places where the power supply is
unstable.
• Always turn OFF the power supply to the PLC, Slave Units, and other Units before
attempting any of the following.
• Assembling the Units (Expansion Units)
• Mounting or dismounting terminal blocks on Remote I/O Terminals
• Mounting or dismounting an I/O Unit, CPU Unit, Power Supply Unit, Memory Cas-
sette, or Master Unit
• Replacing component relays
• Setting DIP switches or node address switches
• Connecting or wiring the cables
●
Installation
• Before touching the Unit, be sure to first touch a grounded metallic object in order to
discharge any static buildup.
• Be sure that the terminal blocks, communications cables, and other items with locking
devices are properly locked into place.
• Always use the enclosed End Plates to securely mount the Units to the DIN Track.
• Be sure that all the terminal screws and cable connector screws of the product are
tightened to the torque specified in the relevant manuals.
• Be sure that the screws of the terminal block are tightened to the torque specified in
the relevant manuals. Insufficient tightening torque may result in fire, malfunction, or
failure.
• Always use specified communications cables and connectors.
• Abide by the specifications for the communications distance and the number of Units
to be connected.
• When using cables in multiple systems, be sure to keep the distance of 5 mm or more
between any two cables to avoid operational instability due to interference.
●
Wiring
• Confirm that the wiring and switch settings are correct before supplying power.
• Use the correct wiring tools to perform wiring.
• Confirm terminal polarity before wiring.
• Do not let a piece of metal enter the Units when wiring or installing.
• Be careful of the following when wiring communications cables.
• Keep communications cables away from power lines and high-voltage lines.
• Do not fold over communications cables.
• Abide by the specifications for the communications cable distance.
• Do not place objects on top of communications cables.
• Always wire communications cables through a duct.
●
Handling
Introduction
Precautions for Safe Use
E3NW-CRT
User's Manual
7
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