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Special functions for coupled IT systems
Special functions for coupled IT systems
iso685-D-P_D00170_00_M_XXDE/06.2016
72
For the ISOnet function, the following settings are made in the menu:
Alarm settings ->
ISONet -> ISONet = BCOM
. The ISOnet function of all ISOMETER®s existing in the system
has to be activated and the number of devices has to be determined.
Also the parameters of the Ethernet (DHCP on or IP address, subnet mask and default
gateway) and BCOM have to be set so that the devices in the ISOnet interconnection can
communicate with each other.
After starting the system, the devices initialise. The initialisation phase ends when the
configured number of devices has been reached. Then, the device starts with a measur-
ing cycle at the lowest address. When an ISOMETER® has finished one measuring cycle,
the authorisation for insulation measurement is forwarded to the ISOMETER® with the
next higher address. While one ISOMETER® is measuring, all other ISOMETER®s are sepa-
rated from the system via internal system isolation switches. By limiting to one subsystem
it is possible to have several ISOnet interconnections running in one system.
If a single device fails, the remaining ISOMETER®s continue the ISOnet operation. For the
failure of one device, two scenarios are possible:
• A device fails during the measuring procedure.
After timeout, another device takes over the measuring function.
In this way, all devices monitor each other.
• The device fails in the inactive mode.
When forwarding the measuring authorisation, the device is skipped and the next
device carries out the measurement.
If a device that has failed before returns, it is taken into the interconnection again and will
have its turn during the next run.
IT-System 1
IT-System 2
IT-System 3
IT-System 4
PE
PE
PE
PE
Ethernet
SWITCH
BCOM
Adr.1
BCOM
Adr.2
BCOM
Adr.3
BCOM
Adr.4
BS-Bus
Adr.1
Adr.3
BS-Bus
Adr.1
Adr.3
BS-Bus
Adr.1
Adr.3
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
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