Special functions for coupled IT systems
Special functions for coupled IT systems
iso685-x-B_D00177_07_M_XXEN/07.2019
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11.3.1 Systempictures
System 1
System 2
1.
2.
3.
4.
SWITCH
11.3.2 Configuration and function
For the ISOnet function, the following settings are
made in the menu:
Alarm settings
-> 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 in the menu
Alarm
settings -> Number of devices
.
Also the parameters of the Ethernet 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 first device with the lowest
address starts with a measuring cycle. 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
separated from the system via internal system isolation switches. By limiting to one sub-
system 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 a 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 can
carry out a measurement during the next run.
11.3.3 ISOnet priority
This function makes it possible to give the device in ISOnet mode a permanent priority in
the system or to take over the priority from another device. While the function is set to
active, all other devices in ISOnet mode are inactive. The last requesting device always
has priority. After 12 hours, the device automatically returns to normal mode.
With the
ISOnet priority
function, priority can be
requested
or
yielded
in the
Control ->
ISOnet priority
menu.
Parallel operation ISOnet and ISOloop
ISOnet and ISOloop must not be activated together, otherwise a measure-
ment is not guaranteed.
