Siemens SIPROTEC 6MD665, Manual

Page: 89 / 222

2.8 Inter relay communication
75
6MD665 Manual
C53000-G1876-C103-3
Figure 2-30 Properties dialog box — IRC combination, User tab
Available devices The names of all SIPROTEC
®
4 devices which can operate as users for the processed
IRC combination are shown in the box Available devices. These are the devices from
the current project which fulfill the requirements for Inter relay communication, and
which are not already users of another IRC combination. In addition to the name of a
SIPROTEC
®
4 device, its position within the project is also displayed.
Selecting a user To add a SIPROTEC
®
4 device to the IRC combination, select its name in the box
Available devices. Then click on Add.
To remove a SIPROTEC
®
4 device from the IRC combination, select its name in the
Combination users box. Then click Remove.
Several devices can be added to, or removed from, the IRC combination simulta-
neously through multiple selection. Alternatively, add or remove a SIPROTEC
®
4
device with a double-click on its name in the appropriate box.
An IRC combination can comprise a maximum of sixteen users. When this number
has been reached, a fault indication is displayed as soon as you want to add another
SIPROTEC
®
4 device.
Specifying a master Each IRC combination requires a SIPROTEC
®
4 device as a master. The first SIPRO-
TEC
®
4 device you select is automatically defined as the master. The master device
is labelled in the box Combination users with a blue circle to the left of the name of
the device.
If another SIPROTEC
®
4 device is to be used as a master, select its name in the box
Combination users. Then click Master.
If the device labelled as the master is removed from the combination, the first SIPRO-
TEC
®
4 device in the list of users is automatically defined as the new master.
Basically, any device in the IRC combination can function as a master. The master
function requires additional processor performance. You should therefore select a
device which is subjected to the least usage by the actual program run.