109
CHAPTER 4 INSTALLATION AND WIRING
4
4.8 Wiring
4.8.2 Wiring of 18-point screw terminal block
4.8.2 Wiring of 18-point screw terminal block
(1) Precautions
• Insulation-sleeved crimping terminals cannot be used with the terminal block.
It is recommended to cover the wire connections of the crimping terminals with mark or insulation tubes.
• The wires used for connection to the terminal block must be 0.3 to 0.75mm
2
in core and 2.8mm max. in
outside diameter.
• Run the input and output lines away from each other.
• When the lines cannot be run away from the main circuit and power lines, use a batch-shielded cable and
ground it on the programmable controller side.
In some cases, ground it in the opposite side.
• Where wiring runs through piping, ground the piping.
• Run the 24VDC input line away from the 100VAC and 200VAC lines.
• Wiring of 200m or longer will raises current leakage due to the line capacity, resulting in a fault.
• To prevent electric shock or malfunction, provide the external power supply for the module to be changed
online with means that can turn the power supply off individually, e.g. a switch. ( Page 265, CHAPTER
14)
• As a countermeasure against the power surge due to lightning, separate the AC wiring and DC wiring and
connect a surge absorber for lightning as shown in Page 103, Section 4.8.1.
• Failure to do so increases the risk of I/O device failure due to lightning.
For screw terminal blocks other than the 18-point screw terminal block, refer to the user's manual for the module used.
DC
RA
Programmable
controller
Shield cable
Input
Output
Shield jacket
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