Yokogawa Data Acquisition with PID Control CX2000 - Manual (Page 238)

9-5
IM 04L31A01-17E
9
Green Series Communications
9.3 Setting the Modbus Master
Setting the Protocol
To perform Green Series communications, set the protocol of the CX to [Modbus-M].
For the procedure, see section 4.2, “Setting the Modbus Protocol.” Connect external
devices to the CX as Modbus slaves.
Setting the Modbus Master Function
When using the CX as a Modbus master, set the read cycle, timeout time, and retrials.
For the procedure, see section 4.3, “Setting the Modbus Master Function.”
Setting Commands
You must set commands when reading the measured data from the connecting model
as communication input data of the CX. Set the channel for reading the data, the
addresses of the connected Modbus slave devices, register addresses, and data type.
For the procedure, see section 4.3, “Setting the Modbus Master Function.”
Note
If you are using the UT Series, a read cycle of 1 s is recommended for every 4 loops connected.
However, communications with the UT320 and UT350 takes twice the amount of time as other
UT series instruments, so a read cycle of 2 s is recommended when using the UT320 or UT350
with 4 loops connected.