Setting: Description:
Command Blocking
When the command blocking DDB signal is active high, either by energising an opto input or control input, all
remote commands will be ignored (i.e. CB Trip/Close, change setting group etc.). When in this mode the
device returns a "negative acknowledgement of command" message to the master station.
3.4 MODBUS CONFIGURATION
To configure the device:
1.
Select the CONFIGURATION column and check that the Comms settings cell is set to Visible.
2. Select the COMMUNICATIONS column.
3. Move to the first cell down (RP1 protocol). This is a non settable cell, which shows the chosen
communication protocol – in this case Modbus.
COMMUNICATIONS
RP1 Protocol
Modbus
4. Move down to the next cell (RP1 Address). This cell controls the Modbus address of the IED. Up to
32 IEDs can be connected to one spur, therefore it is necessary for each IED to have a unique
address so that messages from the master control station are accepted by only one IED. Modbus
uses a decimal number between 1 and 247 for the Relay Address. It is important that no two IEDs
have the same address.
COMMUNICATIONS
RP1 Address
1
5. Move down to the next cell (RP1 InactivTimer). This cell controls the inactivity timer. The inactivity
timer controls how long the IED waits without receiving any messages on the rear port before it reverts
to its default state, including revoking any password access that was enabled. For the rear port this
can be set between 1 and 30 minutes.
COMMUNICATIONS
RP1 Inactivtimer
10.00 mins
MiCOM P747 Chapter 4 - Configuration
P747-TM-EN-1 73
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