Yokogawa Data Acquisition with PID Control CX2000 Manual de usuario descargar pdf (Pagina 238)

9-5

IM 04L31A01-17E

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.

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Yokogawa Data Acquisition with PID Control CX2000 Manual de usuario Pagina 238