7520
Host PC/PLC
7000 situation
Note: the power ground of 7000 and
common ground.
This is the same for Adam 4000, Nudam 6000 and DATAFORTH 9B series modules.
In most applications, the 7520 are used to convert the
ground as the | Host PC/PLC, and the isolation site is in the |
Therefore the | Host PC/PLC is isolated from |
if there is any high voltage transient on
WARNING!! ERROR CONDITION 1: if the 7520 are replaced by 7520R and the 7520R uses the same DC power ground with 7000. In this situation,
(1) | The | Host PC/PLC is common ground with |
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| |
(2) | The | ||||
(3) | The power ground of | 7520R is common ground with power ground of | |||
| 7000 |
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|
| |
(4) | The power ground of | 7000 is common ground with |
| ||
|
|
| |||
Therefore the Host PC/PLC is common ground with | network. | ||||
That is to say, there is no isolation between Host PC/PLC and | |||||
network. The | Host PC/PLC may be damaged if there is high voltage transient | ||||
on |
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|
| ||
7000 Bus Converter User Manual (version 1.2,Feb/2003, | 24 |