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Create a new device

To configure the communication device of YOKOGAWA PLC, select[Tools] → [I/O Devices] or click on the icon on the main toolbar. The ‘I/O Device Configuration’ dialog box will pop up. Click the [New Device] button to open the ‘I/O Device Selection’ dialog box.

I/O Device Name: Give a device name. This name will be used in the tag configuration window of the database accompanied by the ‘Station Name’.

Select a device type

After selecting the [Ok] button on the previous step, the ‘Serial Communication Configuration’ dialog box will popup.

In this window, select the ‘YOKOGAWA Computer Link Protocol’ as the ‘Device Type’ and configure the proper serial communication parameters.   

Comm.Port: COM1

Select a communication port to communicate. If you use RS-422/485, you must select “COM1”.

When the RS-232C communication type of COM1 port is used, the 9P DSUB connector is used.

When the RS-422/485 communication type of COM1 port is used, the 5P plug connector is used.

If you use the COM1 port, you cannot use RS-232 and RS-422/485 at the same time. Only one type can be used per COM port.

Baud rate: 9,600

Select the communication speed for the equipment. The configuration of the communication speed of Xpanel must be the same as the configuration of the equipment. If the speed of the configurations of the two sides is different, they will not communicate with each other.

Parity bit: None

Data bits: 8 bits

Stop bits: 1 bit

RTS/CTS: OFF

RTS/CTS control is used for half-duplex communication. This example does not use RTS-CTS control.

Retry No.: 3

If communication failed with the devices, it will try to reconnect 3 times.

Time Out: 30

The time out count will be 30 seconds.

See the Communication Configuration section for more information about the remaining parameters.

Create a station

Move to the [Station] tab of the ‘Serial Communication Configuration’ dialog box and click the [Add Station] button. The ‘Station’ dialog box will pop up. Configure the contents and press [OK].

Station Name: ST

When the field equipment number exceeds two, the station name is used for the division of field equipment at the internal Xpanel.

It is expressed as “Device.Station”. This example shows you as “DEV.ST”.

Station Type: YOKOGAWA (no other type can be selected).

Network ID: This field has no effect.

Station No: 1

When the field equipment number exceeds two, it assigns a different Station No. to divide. The station number must be the same as configured in the field equipment. If the station numbers are different, the devices will not communicate with each other.

See the Communication Configuration section for more information about the remaining parameters.

RS-232C: Null Modem

Xpanel connects three lines to the PLC. If these lines are not connected, the PLC will receive data, but cannot transmit to other field equipment, therefore the communication fails 

RS-422

The wiring in the terminal resistance must be 330 Ω. To improve the stability of communication, devices should connect through SG, using STP cables. Shielded cables must be earthedgrounded.

RS-485

The wiring in the terminal resistance must be 120 Ω. When using RS-485, connect SDA and SDB, but disconnect RDA and RDB. To improve the stability of communication, devices should connect through SG, using STP cables. Shielded cables must be earthedgrounded.