Yokogawa Value Series FX1000 - Manual (Page 57)

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IM 04L21B01-17EN
Using the Ethernet Interface (/C7 Option)
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1.11 Usage Example of the Modbus Function
Explains the setting example for both Modbus client and server on FX1000s connected
via the Ethernet. In this section, the FX that has been set as the Modbus server is
referred to as “FX1000 server.” FXs that have been set as Modbus clients are each
referred to as “FX1000 client.”
System Configuration and Actions
Uses the measurement channel, computation channel, and communication input data as
described in the figure below. Assumes other conditions are set properly.
FX1000 Server
(Modbus server)
Ethernet
Measured data
Command
Reads the FX’s measured data,
and uses a computation channel
(/M1, /PM1, and /PWR1 options) to display it.
FX1000 Client
( Modbus client)
Measurement channel 001
Input range: –2.0000 to 2.0000 V
Computation channel 101
–2.0000 to 2.0000V
Communication input data C01
Modbus service port
502 (by default)
Start the computation.
Display the channel on Group 1
Server number: 1
Action
• The FX1000 client reads the measured value of channel 001 on the FX1000 server
into the communication input data C01. C01 is displayed on a computation channel
101 by including the data in the equation. The computation channel 101 is assigned to
Group1.
• The measured value of channel 001 on the FX1000 server is transferred to the
FX1000 client as an integer in the range of –20000 to 20000.
• The FX1000 client displays the read data as –2.0000 to 2.0000 V using the
computation channel 101. The following conversion is applied.
Value on the computation channel 101 of the FX1000 client
= Communication input data C01 x 0.0001