GE GFK-1541B manual Consumed Data Exchange Definition, Group ID

5

Consumed Data Exchange Definition

The information to be received by the consumer and the exchange details are defined in the

Consumed Exchanges tab of the Ethernet Global Data dialog box.

The consumed data exchange definition contains the following information:

Field Details

Local Producer ID A value in the form of a dotted-decimal IP address that uniquely identifies the Ethernet Global Data device across the network. For Series 90-70 PLCs, the default is the same as the IP address of the Ethernet Interface closest to the CPU in the main rack. For Series 90-30 PLCs, the default is the same as the IP address of the CPU364 or CPU374 Embedded Ethernet Interface. The default value can be changed.

Adapter Name	Identifies the adapter name of the Ethernet Interface within the
	consuming device. For the CPU374, this field is not editable and displays
	the rack and slot of the CPU.
Exchange ID	A numerical value assigned by the user to identify a specific data
	exchange to be received by the consuming device. It must match the
	Exchange ID specified in the produced exchange.
Remote Producer ID Identifies the Producer ID of the PLC producing the exchange.
Group ID	Used only if the same data is consumed by more than one consuming
	device (the same group ID must also be assigned in the produced data
	exchange definition).

Consumer Period (For the CPU374, this field is not editable as there is no consumer period.) A value with a possible range of 10–3,600,000 milliseconds (10 milliseconds to 1 hour) that specifies how often the consuming device should scan the local Ethernet Interface for new data and/or status updates. The actual scan time may be affected by the logic sweep time. Scanning the data will not interrupt normal logic sweep execution. For peak efficiency, the consumer period should be set to the same value as the Producer period in the corresponding produced data exchange definition. The default is 200 milliseconds.

Round this value to the nearest 10 milliseconds before you enter it. The consumer period has a resolution of 10 milliseconds. If you enter a value such as 12 milliseconds, the actual consumer period will be rounded up to 20 milliseconds.

Update Timeout A value with a possible range of 0, 10–3,600,000 milliseconds that specifies how often the Ethernet Interface should declare the occurrence of a refresh error. The error signals when a first or subsequent packet of data does not arrive within the specified time. It is recommended that the value be at least double the producer’s producer period value and 20 milliseconds greater than the consumer period to allow for transient network delays. The default is 0 indicating no timeout is used.

Round this value to the nearest 10 milliseconds before you enter it. The update timeout has a resolution of 10 milliseconds. If you enter a value such as 22 milliseconds, the actual update timeout will be rounded up to 30 milliseconds.

5-14 TCP/IP Ethernet Communications for the Series 90™ PLC User's Manual– May 2002 GFK-1541B