GE GFK-1541B manual Reply Rate, Status Word

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Producer Period A value with the possible range of 10–3,600,000 (10 milliseconds to 1 hour) representing the scheduled repetition period at which the data is to be produced on the network. In the PLC, the Ethernet Interface will produce the data at this interval independent of when the CPU updates the data sample. The default is 200 milliseconds. For the CPU374, the range is 2 milliseconds to 1 hour. The CPU374 also allows a zero producer period which indicates producing “as fast as possible”.

Round this value to the nearest 10 milliseconds (2 milliseconds for the CPU374) before you enter it. The producer period has a resolution of 10 milliseconds (2 milliseconds for the CPU374). If you enter a value such as 12 milliseconds, the actual producer period will be rounded up to 20 milliseconds (not rounded for the CPU374).

Reply Rate	Currently not used.
Status Word	A variable that identifies the memory location where the status value for
	the produced exchange will be placed. Valid memory types are listed
	later in this chapter.

Exchange Variables A list of data elements making up the snapshot of internal memory that will be produced on the network. Each exchange has one variable list, which will be transmitted to the consuming device as a contiguous set of bytes. A maximum of 100 variables can be defined in one exchange definition and the size of all combined elements cannot exceed 1400 bytes. The data types BOOL and BOOL_STATE are not allowed for exchange variables.

GFK-1541B Chapter 5 Ethernet Global Data 5-13