CompoBus/D Communications Line Design

Chapter 2

 

 

 

2-4 Communications Line Noise Prevention

2-4-1 Communications Line Noise

The communications line sends and receives high-speed pulse signals, and checks whether the data is correct by checking the sequence of the signals. If the amount of noise on the communications line is too great, the interference will alter the communications signal data, and communications will be impossi- ble. Communications lines are more sensitive and require higher speeds than normal I/O lines, so be sure that noise does not interfere with communications. Use the preventative noise countermeasures described here when configuring the system to ensure smooth system start up.

2-4-2 Grounding the Network

HGrounding the Network

The CompoBus/D Network must be grounded at only one location so that a ground loop is not created. The ground should also be connected as close as possible to the center of the Network. Connect the cable shield to the ground terminal on the communications power supply and then connect to a ground of 100 max., as shown in the following diagram.

 

Power Supply Tap

 

 

V+

 

V+

 

CAN H

 

CAN H

 

Shield

 

Shield

Communications

CAN L

 

CAN L

cable

 

 

V–

 

V–

 

Ground

V–

V+

 

terminal

 

 

 

FG V– V+ Communications power supply

Ground (100 max.)

If more than one communications power supply is connected to the same Network, ground only the one nearest the center of the Network. Do not connect the shield wire at the other power supplies.

Note

1.

Always ground the communications cable shield at one and only one location in the Network.

Note

2.

Always ground to 100 or less.

Note

3.

Always use a separate ground. Never use the same ground as for Inverters or other drive

 

 

system devices.

HGrounding the CompoBus/D Communications Card

The CompoBus/D Communications Card should be grounded according to DeviceNet recommenda- tions installing a noise filter as shown in the following diagram. The ground is normally wired to the ground terminal (12 (G)).

2-15

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Omron 3G3FV-PDRT1-SIN user manual Communications Line Noise Prevention, Grounding the Network

3G3FV-PDRT1-SIN specifications

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