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Owning Palette: Variables & I/O Servers VIs

Installed With: DSC Module

Creates a new Modbus, Modbus Slave, or OPC Client I/O server and adds the I/O server to the Shared Variable Engine.

You also can use this Express VI to configure or replace an existing I/O server.

Dialog Box Options

Block Diagram Inputs

Block Diagram Outputs

Dialog Box Options

Parameter	Description
I/O server type	Specifies the type of I/O server you want to configure or create.
Set Attributes	Displays the Configure Modbus I/O Server, Configure Modbus Slave I/O Server, or Configure OPC Client I/O Server dialog box, depending on the I/O server type that you specify.
Common Parameters	Specifies general information about the process and the I/O server you want to configure or create. Process name—Specifies the name of the process to which this VI belongs. I/O server name—Specifies the name of the I/O server you want to configure or create. Overwrite if the I/O server exists—Specifies whether to replace an existing I/O server with the I/O server you want to create if the two I/O servers have the same name.
Tips	Specifies tips for configuring or creating the I/O server.

Block Diagram Inputs

Parameter	Description
Process name	Specifies the name of the process to which this VI belongs.
I/O server name	Specifies the name of the I/O server you want to configure or create.
Overwrite	Specifies whether to replace an existing I/O server with the I/O server you want to create if the two I/O servers have the same name.
Address	Specifies the address of this instance of the I/O server. This option appears if you select Modbus or Modbus Slave from the I/O server type pull-down menu on the configuration dialog box of this Express VI.
Baud rate	Specifies the baud rate of this instance of the I/O server. You can select a value from 2400 to 115200. This option appears if you select Modbus Serial from the Model pull-down menu of the Configure Modbus I/O Server or Configure Modbus Slave I/O Server dialog box.
error in (no error)	Describes error conditions that occur before this VI or function runs.
Refresh rate	Specifies how often this instance of the I/O server refreshes the device, in seconds. This option appears if you select Modbus from the I/O server type pull-down menu on the configuration dialog box of this Express VI.
Serial port	Specifies the serial port this instance of the I/O server uses to communicate with the device. You can select a serial port in the range from COM1 to COM32. This option appears if you select Modbus Serial from the Model pull-down menu of the Configure Modbus I/O Server or Configure Modbus Slave I/O Server dialog box.
IP address	Specifies the IP address of the device with which the Modbus I/O server communicates. This option appears if you select Modbus Ethernet from the Model pull-down menu of the Configure Modbus I/O Server dialog box.
Deadband	Sets the percent change within a range that a value from the OPC server must change before the OPC server communicates the value to the Shared Variable Engine. This option appears if you select OPC Client from the I/O server type pull-down menu on the configuration dialog box of this Express VI.
Machine	Specifies the name of the computer from which you can select an OPC server. This option appears if you select OPC Client from the I/O server type pull-down menu on the configuration dialog box of this Express VI.
Prog ID	Specifies the ID of the OPC server. This option appears if you select OPC Client from the I/O server type pull-down menu on the configuration dialog box of this Express VI.
Reconnect poll rate	Specifies how often, in seconds, the Shared Variable Engine attempts to connect to an OPC server after losing the connection to the server. Enter a value of 0 if you do not want the Shared Variable Engine to retry the connection.This option appears if you select OPC Client from the I/O server type pull-down menu on the configuration dialog box of this Express VI.
Update rate	Determines the amount of time that passes before the OPC server communicates updated values to the Shared Variable Engine. This value is a requested update rate for the OPC server. The actual update rate returned by the OPC server is greater than or equal to this value. Entering a value of 0 returns the fastest update rate possible from the OPC server.This option appears if you select OPC Client from the I/O server type pull-down menu on the configuration dialog box of this Express VI.

Block Diagram Outputs

Parameter	Description
I/O server URL out	Returns the relative URL to the computer if the I/O server configuration is successful. Otherwise, I/O server URL out returns an empty string. Wire I/O server URL out to the I/O server URL input of the Delete IO Server VI to remove the I/O server programmatically.
error out	Contains error information. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information. Otherwise, it describes the error status that this VI or function produces.