User`s manual

DSM314 COMM REQ
GFK-1742A Appendix B DSM314 Communications Request Instructions B-3
B
The Command Block:
The Command Block consists of several words of PLC memory that contain
additional information about the communications request. This information includes timing
parameters, a pointer to the Status Word, a Data Block, memory types and sizes, and a specific
command code. The Data Block specifies the direction of the data transfer (via the Command
Code) and location and type of data to be transferred.
The Status Word:
The Status Word is a single location in PLC data memory where the CPU
reports the result of the communications request. The Status Word address is specified in the
Command Block by the user. The following table lists the status codes reported in the Status
Word: