Rockwell Automation 57C570 AutoMax PC3000 User Manual - Manual (Page 162)

14Ć4
14.2 Configuring BlockĆTransfers
For each blockĆtransfer request you will be sending, you must
assign variable names to the following before you can send a
blockĆtransfer request:
D status and control registers in which you specify the destination
and behavior of the request
D data table registers, which are used to exchange data between
the scanner module and the blockĆtransfer module
14.2.1 Assigning Variable Names to a BlockĆTransfer
Status and Request Table
Each blockĆtransfer request has 4 words reserved for status and
control. The words are organized as follows:
This word: Is used to:
Status and Control (first word) initiate the request and monitor its
status
This is the blockĆtransfer status and
control register.
Rack/Slot/Grp/Req (second word) D define the blockĆtransfer module's
location
D define the request as either a read or
a write
Length of Block Xfer (third word) define the number of words read or
written during the transfer
Update Time (fourth word) specify how often you want the request
to be initiated
See Appendix D, Register Assignment Map" for a listing of the
registers associated with the blockĆtransfer status and request table.
To assign variable names to the blockĆtransfer status and request
table registers, use the scanner module's Variable Configurator
form. When you choose the Block Transfer Status and Request
Table view, you see a form similar to the one shown in figure 14.3.