Agilent Technologies DP111 Especificações descarregar pdf (Página 211)

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Section 5 Maintenance FOUNDATION Fieldbus H1 – CI852

3BSE036351-510 A 211

One or more field

devices appear to

be slow to

respond or

completely dead

The network

problem is

proving very

difficult to solve

1.A device may be:

• Incorrectly addressed.

• Connected with incorrect polarity.

• Faulty and causing breakdown or heavy loading of the

network.

2. The fieldbus cable may:

• Be damaged causing a short-circuit, breaks or grounding

of the data wires, (possibly intermittent).

• Be incorrectly terminated.

• Contain sections having reversed polarity due to incorrect

connections.

• Cause supply voltage drops due to damage or bad

connections.

3. The network power supply may be faulty.

• Rectify the network power supply.

Give consideration to possible activities within the plant, such

as maintenance or repair work, which may be causing the

problem. Having totally ruled this out, then proceed as follows:

Check the DC supply voltage in powered networks by means of

a digital voltmeter having an input capacitance of less than

1000 pF.

Table 32. FOUNDATION Fieldbus H1 CI852 – Fault-Finding (Continued)

Fault Possible Cause and Corrective Action

1 2 ... 206 207 208 209 210 211 212 213 214 215 216 ... 451 452

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