Precautions When Connecting To The Network - Hitachi HIDIC EH-150 Applications Manual

13.6 Precautions when Connecting to the Network

• A device should be connected to the network through a drop line, by using a branch tap from the trunk line.
• When a multidrop connection to a drop line is made, be sure that the connector will not be pulled out by the
weight of the cable.
• Always turn off the power supply to all devices and the communication power supply itself when
connecting a communication cable.
• It is recommended to use clamp terminals when plugging a communication cable into a
connector.
If the communication cable is connected simply by twisting the wires, it may result in
malfunction or damage to the product due to cable disconnection.
• Make sure to make correct connection of signal lines, power supply lines, and shielding line.
• Pay full attention when wiring, so that neither signal lines, power supply lines, nor the shielding
line will be pulled out during communication.
• After wiring the communication cable, be careful not to put excessive stress on the
communication cable as well as the connector. It may cause the connector to be pulled out or a
broken cable.
• Allow enough bending radius for the communication cable. If forcibly bent, the connector may be
pulled out or a broken cable.
• Check the wiring of the communication cable thoroughly before turning on the communication
power supply and the power supply to the internal circuit of each device.
Chapter 13 Mounting and Wiring
Allow a sufficient margin of cable length
and fix it so that the connector will not be
pulled out by the tensile force of the cable.
Caution
13-4