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21 Configuring – Modbus
The SAM module has two ports for Modbus communication.
The most commonly used port is the Modbus TCP
(Ethernet). The SAM also provides a serial Modbus RTU
port.
The Modbus Serial port uses the RJ-45 jack for convenience
only. This port is NOT an Ethernet port.
A standard Modbus map is provided and will meet most
applications. A custom register map can be created if
needed (see following paragraphs).
21.1 Modbus Ethernet Connection
To use the Modbus Ethernet port, you must:
• Enable Modbus Ethernet
• Set the IP address of DCS
Access these settings from the Modules tab. Select the SAM,
and then open the Properties pane.
The VC-8000 uses a static IP address. DHCP is not
supported.
21.2 Serial Modbus Connection
To use the Modbus Serial port, you must:
• Enable Serial Modbus
• Set communication parameters
• Select the format (RS-232/485 etc.)
21.3 Modbus Settings
21.3.1 Slave Address
The Slave Address (shown in SAM settings) is only used for the standard (default) Modbus map.
This setting is ignored when a custom Modbus map is used. In a custom Modbus map, the slave
address is set in the excel file (imported map) (see Section 21.5).
If you are doing a rack replacement (i.e. one VC-8000 replacing two BN 3300 racks) you can use
multiple Modbus slave addresses in the custom Modbus map. This will allow the customer to install
the new VC-8000 without reprogramming the DCS Modbus program.
20-1) Modbus Connections
21-2) Modbus Ethernet
21-3) Modbus Serial
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