Rockwell Automation AADvance Controller Configuration Guide - Manual (Page 69)

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Document: 553633
ICSTT-RM405f-EN-P
Issue 07
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Note: The Port field does not apply for a serial connection, and is disabled.
5) If you set the Connection to Ethernet, do the following:

Set the Protocol field, click Apply.
Note:As a Modbus slave, the controller supports Modbus RTU, using a serial or
Ethernet connection; and Modbus TCP, using an Ethernet connection. You can
configure a combination of connections for the Modbus slaves, subject to a
limitation of no more than two Modbus RTU slaves using serial communications
for each processor.

The Id field represents the Unit ID; set the Id field or accept the default value.

The default setting for the Port field suits most systems; occasionally, you will
have to adjust it. Make sure the Port field matches the port expected by the
Modbus master.
If the Port field is set to 502, Modbus TCP protocol is enabled. All other settings
of the Port field will enable Modbus RTU protocol packaged as a serial stream
over Ethernet. This can be converted back to a serial connection using a standard
terminal server.
Note: The range of values accepted for the Id field, and the default value for the
Port field, vary according to the protocol selected.
6) Click Apply.
Modbus Slave Communication Parameters
Each Modbus slave has a series of communication parameters as detailed in the tables.
Table 3: Modbus RTU Slave Parameters
Description Value(s) Default Remarks
Connection Not Configured, Sn-1, Sn-2,
Ethernet (†) Not
Configured
Id 1 to 247
(serial);
1 to 255
(Ethernet)
1
(serial);
255
(Ethernet)
Represents the Slave ID
for a serial connection
Represents the Unit ID for
an Ethernet connection
Port 0 to 65,535 2000 Only used with Ethernet
connections
Note: (†) The letter 'n' identifies the processor module:
1 = processor A, 2 = processor B, 3 = processor C.
Table 4: Modbus TCP Slave Parameters
Description Value(s) Default Remarks
Connection Not Configured, Ethernet Not
Configured