Special functions for coupled IT systems
Special functions for coupled IT systems
iso685-D-P_D00170_00_M_XXDE/06.2016
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13.3 System isolation via ISOnet
The ISOnet function ensures via an Ethernet connection that only one ISOMETER® of the
interconnection is active when several ISOMETER®s are connected to an IT system.
For several ISOMETER®s to be able to measure in the same ISOnet inter-
connection, the settings for the BCOM system name and the BCOM sub-
system have to be the same. Only the device address has to be different. If
this is not taken into account, the ISOnet function will not work.
If the ISOnet function is deactivated in an ISOMETER® in an ISOnet inter-
connection, it will measure continuously and will not forward measuring
commands to the next device in the interconnection.
In comparison to a solution with coupling switches and function input,
the response time will be extended because the measurement in the IT sys-
tem is not carried out continuously.
The addresses of the ISOMETER®s in the ISOnet interconnection can be se-
lected at will. The addresses do not have to be subsequent but they have
to differ from each other.
If in addition to the ISOnet interconnection the digital inputs are wired
and a device is deactivated via a digital input, the device will forward the
measuring authorisation until the signal at the digital input disappears.
Afterwards, it participates again in the measuring interconnection.
The IP address of the standard gateway must suit the subnet mask, so that
the ISOnet function can operate correctly.
CAUTION
Maximum number of devices in an ISOnet interconnection: 20 devices
IT-System 1
IT-System 2
PE
PE
Adr.3
Adr.1
BCOM
Adr.1
BCOM
Adr.2
BS-Bus
BS-Bus
Adr.1
Adr.3
I
L
I
n
ISOSCAN®
EDS440
7 6
5
3
4
2
0
1
5
3
4
2
0
1
9
TEST
MUTE
RESET
ALARM
ALARM
ON
COM
SERVICE
CHANNELS
SLAVE ADDRESS
12
11
10
9
8
7
1
2
3
4
5
6
I∆L
I∆n
I
L
I
n
ISOSCAN®
EDS440
7 6
5
3
4
2
0
1
5
3
4
2
0
1
9
TEST
MUTE
RESET
ALARM
ALARM
ON
COM
SERVICE
CHANNELS
SLAVE ADDRESS
12
11
10
9
8
7
1
2
3
4
5
6
I∆L
I∆n
