Chapter 4. ConfigurationGFK-2224Q January 2017 63Destination Identifies the data’s consuming device, based on the Destination Type selected: a dotted-decimal IP address if Destination Type is IP Address the group’s ID (1–32) if Destination Type is Group ID the value 255.255.255.255 if Broadcast IP is the Destination Type.ProducedPeriodThe scheduled repetition period at which the data is produced on the network. Configure avalue in the range of 0 or 2–3,600,000 (2 milliseconds to 1 hour). The value zero means atthe end of the next PLC scan, but not less than 2 milliseconds from the previous production.Set the production period to ½ the period at which the application needs the data in thisexchange. Round this value to the nearest 2 milliseconds.Send Type Fixed at “always.” In the PLC, production of EGD is controlled by the I/O state: whenenabled, EGD production is enabled, and when disabled, EGD production is disabled.Reply Rate Not used.Run ModeStore EnabledWhen set to True, allows you to modify or delete this exchange and store the changes whilein Run mode. You can add exchanges in Run mode regardless of the setting of thisparameter. It is recommended that you keep this parameter at its default setting, False,unless your application has a specific need to modify this exchange in Run mode.Double-clicking on the produced exchange opens a window for configuring the variables within the exchange.Each exchange has its own variable list. These variables contain the data that is produced to the network. Eachvariable contains the following information:Offset (Byte.Bit) The location within the data area for this exchange where the start of the data for thisvariable is located. The offset is expressed as Byte.Bit, where Byte is a zero-based byteoffset and Bit is a zero-based bit position within that byte. (Valid bit values are 0-7. Bit 0 isthe least-significant bit within the byte; bit 7 the most significant.)Variable The name defined for this variable.Ref Address The PLC memory reference address that contains the start of the data for this variable.Ignore Not used for Produced exchange.Length Size of the data for this variable, expressed in units of the selected PLC referencememory type.Type Data type of the selected PLC reference memory type. (Automatically set up by the RefAddress selection.)Description An optional text description of this variable.To add a new variable to the end of the exchange, click the ‘Add’ button. This does not change the data offsetsof any existing variables within that exchange.To insert a new variable among the existing variables, click on an existing variable. When you click the ‘Insert’button, a new variable will be created ahead of the selected existing variable. This changes the data offsets ofall subsequent variables in the exchange.Once a new variable has been entered, double-click a data field within the row to edit that value.To delete an existing variable, click on the variable row and then click the ‘Delete’ button.The sum of all variables in the exchange must not exceed 1400 bytes. The total length of the exchange (inbytes) is displayed as ‘Length (Bytes):’ at the top of the exchange window above the variable list. PACSystemsCPUs with firmware version 5.0 and later support a maximum of 30,000 variables for all exchanges. Earlierfirmware versions support approximately 12,000 variables for all exchanges.
