Wiring Precautions; Reducing Electrical Noise For External Wiring - Omron CQM1H-SCB41 Operation Manual

Wiring
2-3-2

Wiring Precautions

2-3-3

Reducing Electrical Noise for External Wiring

18
RS422A/485 Cable
Model
CO-HC-ESV-3P 7/0.2
Refer to pages 11 and 12 for the connector pin layouts. Refer to 2-3-5 Recom-
mended RS-232C Wiring Examples and 2-3-6 Recommended RS-422A/485
Wiring Examples for wiring examples, and to 2-3-7 Wiring Connectors for wir-
ing methods.
Standard cables are available for connection to personal computers and PTs.
Refer to SECTION 4 Host Link Communications for personal computer cables
and to your PT user's manual for PT cables.
• Before connecting or disconnecting the communications cables, always
make sure that the PC is turned OFF.
• Tighten the communications connector screws firmly with your fingers.
• Serial Communications Boards can be connected to various devices. For
compatibility, refer to the operation manuals for the devices to which they
are to be connected.
Observe the following precautions for external wiring.
• When multi-conductor signal cable is being used, avoid using I/O wires
and other control wires in the same cable.
• If wiring racks are running in parallel, allow at least 300 mm between the
racks.
Communications
cables
PC power supply
and general control
circuit wiring
Power lines
• If the I/O wiring and power cables must be placed in the same duct, they
must be shielded from each other using grounded steel sheet metal.
Communications
cables
Ground to 100
Hirakawa Hewtech Corp.
Low-current cables
Control cables
Power cables
Ground to 100 or less.
PC power supply
and general control
circuit wiring
Power lines
or less.
Section 2-3
Manufacturer
300 mm min.
300 mm min.
Steel sheet metal
200 mm min.