Rockwell Automation AADvance Controller Configuration Guide User Manual

Page 69



Document: 553633
ICSTT-RM405f-EN-P
Issue 07

4-29

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

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