ICP DAS USA 7000 Series User Manual page 22

WARNING!! ERROR CONDITION 2: if the
power ground with
provide non-isolated DC power source to
The Host PC/PLC is common ground with power ground of
(1)
The power ground of
(2)
Therefore the
That is to say, there is no isolation between
network. So the
transient on RS-485 network.
OK CONDITION: If the DC power ground of
to any module, the
all conditions.
The power adapter PWR-24 is designed for single 7000 series modules
only. The 24V DC output of the PWR-24 is isolated from its AC input. If the
7520 or 7520R is connected to the PWR-24, this PWR-24 cannot connect
to the other module. Normally the
the DC output of this power supply is also isolated from its AC input. Therefore
the DC power ground of
Therefore, the
Host PC/PLC is isolated
from RS-485 network
for 7520 or 7520R in
all condition
7000 Bus Converter User's Manual (Version 1.8 Jan/2006, 7PH-006-18) --------------- 22
Host PC/PLC (for example,
7520 is common ground with
Host PC/PLC is common ground with
Host PC/PLC may be damaged if there is high voltage
Host PC/PLC will be isolated from
7520 or
Host PC/PLC is isolated from
7520 uses the same DC
7520). In this situation,
Host PC/PLC and
7520 or
Host PC/PLC uses a switching power and
7520R is isolated from
RS-485 network in all condition.
Host PC/PLC
7520
RS-485
RS-485 network.
RS-485
7520R is not common
RS-485 network in
Host PC/PLC.