Yokogawa Button Operated MV2000 - Manual (Page 54)

M-4662 2-40
2.10 Usage Example of the Modbus Function
This section explains an example of setting two MV1000s that are connected via the
Ethernet network, one configured to be a Modbus client and another configured to be a
Modbus server. This section refers to the RD-MV1000 configured to be a Modbus server
as the RD-MV1000 server and the RD-MV1000 configured to be a Modbus client as the
RD-MV1000 client.
System Configuration and Operation
The measurement channels, computation channels, and communication input data
shown below will be used. We assume that the Ethernet interface is already configured.
MV1000 server
(Modbus server)
Ethernet
Measured data
Command
Reads measured data from the MV1000
and displays data on a computation
channel (/M1 option).
MV1000 client
(Modbus client)
Measurement channel 1
Input range: –2.000 to 2.000 V
Computation channel 101
–2.000 to 2.000 V
Communication input data C01
Modbus service port
502 (default value)
Start the computation
Displayed in group 1
Server number: 1
Operation
• The RD-MV1000 client reads the measured value from the RD-MV1000 server
channel 1 into communication input channel C01 and displays the value on
computation channel 101. The MV displays computation channel 101 in group 1.
• The measured value of RD-MV1000 server channel 1 is transferred to the RD-
MV1000 client as an integer in the range of –20000 to 20000.
• The RD-MV1000 client displays values in the range of –2.0000 to 2.0000 V for values
in the range of –20000 to 20000. The value is linearly scaled using the following
equation.
The value on RD-MV1000 client computation channel 101 = Communication input
data C01 Ч 0.0001