Chapter 15: Appendix

[3] Wiring the power lines and grounding the network equipment in an FL-net

This section describes how to wire the power lines and ground lines for the network equipment in an FL- net system.

When wiring power lines and making ground connections, observe the precautions below.

1.Connect the coaxial cable ground terminal to the class D ground that is specially created for the controller.

2.Connect the frame ground of the hubs for a 10BASE-T system to the class D ground that is specially created for the controller. Supply power to the hub from an isolation transformer with a static electric- ity protective function (used to power the controller).

3.Provide an exclusive class D or better ground for the controller FG (frame ground) terminal. Do not connect this terminal to the controller frame.

4.Connect the FG (frame ground) terminal of FL-net modules to the FG (frame ground) of the controller.

5.Connect the shield ground on the transceiver (AUI) cable to the FG (frame ground) terminal on the FL-net module.

6.When a transceiver (AUI) needs DC power (12 VDC etc.), provide a stable power supply for exclusive use by the network, and connect the DC output terminals to the FL-net module. 100 VAC input power needs to be supplied from the isolation transformer, the same as for the controller.

Coaxial cable

Transceiver

Ground terminal

Hub

 

Transceiver

 

cable

 

 

 

 

(AUI cable)

Isolation transformer with static electricity

protective function

100 VAC

Class D ground

100 VAC

12 VDC power

Class D ground

for AUI

 

exclusively for use

by the controller

Example of how to wire power lines and ground lines for network equipment in the FL-net system

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