Yokogawa Button Operated MV2000 - Manual (Page 55)

IM MV1000-17E
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 MV1000 configured to be a Modbus server as
the MV1000 server and the MV1000 configured to be a Modbus client as the 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 MV1000 client reads the measured value from the 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 MV1000 server channel 1 is transferred to the MV1000 client
as an integer in the range of –20000 to 20000.
• The 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 MV1000 client computation channel 101 = Communication input data
C01 Ч 0.0001