Advantech RS-485 Instrukcja Użytkownika Pobierz pdf (Strona 334)

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101

F-2 ADAM-5000

Grounding Reference

Field Grounding and Shielding Application

Overview

Unfortunately, it’s impossible to finish the system integration task at a

time. We always meet some troubles in field. Such as communication

network or system isn’t stable, noise influence, and equipment is

damaged or hungs up by thunders. However, the most possible issue

is just the improper wiring; ie, grounding and shieldinF. As you know

the 80/20 rule in our life: we spend 20% time for 80% works, but 80%

time for left 20% works. So to system integration, we paid 20% cost for

Wire / Cable and 80% cost for Equipment. However, 80% reliability

depends on Grounding and ShieldinF. In a word, we just need to pay

20% investment and work on those two issues to get a high reliable

system.

This application note will bring you some concepts about field

grounding and shieldinF. Below topics will be illustrated in following

pages.

1. Grounding

1.1 The ‘Earth’ for reference

1.2 The ‘Frame Ground’ and ‘Grounding Bar’

1.3 Normal Mode and Common Mode

1.4 Wire impedance

1.5 Single Point Grounding

2. Shielding

2.1 Cable Shield

2.2 System Shielding

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