UT150 OPC Server via Ethernet

Application:

PC based SCADA systems provide a consolidated view of plant control systems. Yokogawa Green Series controllers can be integrated into the SCADA system with a Modbus OPC Server. Typical applications use serial connections between the PC and controllers. Installation costs of the serial cable can be expensive. Many new installations can take advantage of the existing Ethernet. This application describes the configuration of multiple Yokogawa controllers connected to a PC via Ethernet.

The SCADA system will read and write controller variables via the Kepware OPC server. The Kepware Modbus/RTU OPC server uses Ethernet Encapsulation to transmit the Modbus/RTU message across the Ethernet network to a Device Server located near the controllers. The Device Server extracts and transmits the Modbus/RTU message to the Yokogawa controllers. The Yokogawa controllers RS485 port with Modbus/RTU protocol allows a daisy chain configuration of up to 15 controllers. Multiple Device Servers can be used for larger systems.

Equipment:

Yokogawa UT150 Temperature Controllerhttp://www.yokogawa.com/cis/TemperatureControllers/UT100Series/cis-ut150-001-en.htm

Kepware OPC Server - Modbus RTU driver with Ethernet Encapsulationhttp://www.kepware.com/Spec_Sheets/Modbus_Serial.html

Digi One SP Device Server (Serial to Ethernet)http://www.digi.com/products/externaldeviceservers/digionesp.jsp

Digi One SP hardware setup:Set dip switches 3 and 4 ON (up)

SW3 = EIA-485 Half DuplexSW4 = Termination Resistor

Connect Digi One SP serial port (DB9) to UT150:2 RxD+ connect to UT150 terminal 3 RSB(+)3 TxD+ jumper to pin 25 GND connect to UT150 terminal 5 (GND)

Modbus RTU

Ethernet

UT150 OPC Server via Ethernet

6 RxD- connect to UT150 terminal 4 RSA(-)9 TxD+ jumper to pin 6

Connect Digi One SP Ethernet port to PC

UT150 settings (/RS option for RS485 communications):Modbus RTU (PSL = 4), 9600, 8, 1, Even (Default settings)Modbus Address = 1 (Must have unique address for each RS485 device)Pins 3 - 5 RS485 two wire (daisy-chain multiple controllers)

Follow the Digi One SP Quick Start Guide to set the IP address:http://www.digi.com/support/productdetl.jsp?pid=1925&osvid=56 Digi One SP embedded Web page - Serial Port Configuration:

Device type = PrinterTerminal Type = VT100Flow Control = NoneSerial settings 9600, 8, 1, Even

Digi One SP embedded Web page - Network Configuration:The port number, 2101, is required for the OPC server configuration. The default base socket is 2000. Add 0 to the base socket for Telnet connection. Add 100 to the base socket for raw connection. Also, add the port number to the base number. For example, the OPC Modbus driver with Ethernet Encapsulation will require connection to port number 2101, a raw connection to port 1.

Kepware OPC Server – IP and Port Number Configuration:Set the IP address = IP address of the Digi One SPSet the Port number = 2102Set the Device ID = UT150 Modbus address (default = 1)

UT150 OPC Server via Ethernet