Yokogawa Data Acquisition with PID Control CX2000 - Manual (Page 29)

1-12
IM 04L31A01-17E
Ladder Communications
You can connect the CX to a host such as a PLC and use the ladder communication
protocol to read and write data in the CX register from the host.
In ladder communications, commands from the host are used to send the destination
station number (the address of serial communication settings), the D register number,
and the write data (setting for control).
To read the measured data on the CX, commands are used to send the destination
station number (the address of serial communication settings), the D register number,
and the number of data points to be read.
In ladder communications, BCD codes are used to create programs that read and write
to the D register.
Note
• The ladder communication function of the CX assumes a connection to a PLC. However,
communications with other host machines are possible, if the host machines comply with the
ladder communication protocol.
• In ladder communications, BCD codes are used inside the data frame.
• For a description of the settings required in using this function, see section 5.1.
PLC
CX CX CX
1.3 Serial Communication Function