CARLO GAVAZZI VMU-C EM, Instruction Manual

Page: 25 / 126

VMU-C
VMU-C Instruction manual 25
3.1.6 MODBUS TCP
Clicking on “MODBUS TCP” will display a sub-menu, “SLAVE”, which allows setting the
MODBUS TCP communication through the Ethernet port.
Fill in the fields according to the following specifications:
 “
Modbus TCP Enabling
”: check the relevant box to enable this function.
 “
Port
”: set the relevant Ethernet port. 502 is the standard for Modbus TCP.
Press “Save setting” key to store enabling and port settings.
Press “Modbus TCP Mapping” key to enter the Modbus TCP configuration page, where
the runtime configuration (the last saved configuration) is shown.
In case some modifications are carried out to the configuration but not saved, next time
the “Modbus TCP mapping” page is accessed, by pressing the “Resume Configuration”
key, you can proceed with the interrupted modification process.
3.1.6.1 Modbus TCP Mapping
In the “Modbus TCP Mapping” page all the energy meters installed on the Modbus RTU
bus (as defined in the Plant Configuration Wizard) are listed, ordered by serial address.
Their tag name are shown in the Description field. The table also shows the relevant
Modbus TCP address, whenever correctly assigned (green LED). A red LED shows if the
relevant configuration is not correct (i.e. the selected TCP address is already used).
A yellow LED shows if the instrument is disabled in the Modbus TCP mapping.
The list includes the VMU-C itself: if equipped with analogue/temperature input modules,
these variables can be retransmitted by Modbus TCP.