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Control to work, GCP-30 parameter 120 Control via COM X1X5 must be turned
on and discrete input Automatic 2 (Terminal 5) must be asserted. If remote alarm
acknowledgment is required, GCP-30 parameter 122 Ackn. F2,F3 via COM
interf must be turned on in addition. If power setpoint shall be accepted by
the GCP-30, discrete input Automatic 1 (Terminal 3) must be de-energized and
parameter 78 Power set point value: external input must be set to OFF.
monitored control
Similar to control but in addition the remote control is monitored and a Modbus
muster must cyclically update the remote control words by writing to the remote
control data table. If a Modbus master fails to do this within a certain time limit,
the GCP-MG will trigger an Interface error X1X5 alarm on the GCP-30. For
Monitored Control to be effective, GCP-30 Parameter 121 Supervision X1X5 must
be turned on.
Once you click Save the new settings are stored and applied instantly. A confirmation
message is shown.
It is of great importance to ensure that there is not two devices with the same
Modbus address. In such a case, an abnormal behavior of the whole serial bus can
occur, the master being then in the impossibility to communicate with all present
slaves on the bus.
Configuring serial line Modbus
The Modbus settings for serial line can be configured to match the network configuration
of your Modbus master device. Select the Configuration→Modbus sub-menu from
the menu bar to open the Modbus settings which are shown below:
Figure 5.9: Modbus settings page
The following Modbus settings can be entered:
Physical layer
Can be set to two-wire RS-485 or RS-232 mode. RS-485 is the default. Depending
on this setting either the D-sub (RS-232) connector or the terminal block connector
(RS-485) of the GCP-MG is utilized.
Transmission mode
Only RTU mode can be selected here.
UMGCPMG-2201
Web browser based management
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