Rockwell Automation 2706-MB1 MESSAGEVIEW 421 SOFTWARE MANUAL - Manual (Page 216)

10–8 Terminal and Communication Setup
Publication 2706-817
2. Enter the parameters for each block transfer to be used.
Use: To:
Enabled Enable or disable the block transfer.
Address
Specify the starting address of the block transfer in a
native SLC or PLC (Remote I/O) link.
Mode Select Read or Write.
Length
Select the number of words (1 to 64) required by the
block transfer.
A length of 63 is reserved for Pass-Through.
3. Select OK to return to the Communication Setup dialog.
Note: Pass-Through Enable and Block Transfer Timeout are future
enhancements. Ignore them in this dialog.
Example
In this example, two block transfer assignments are specified.
N77:2
N7:0
!
ATTENTION: When block transfer is used, be
certain that if the Return Message Number global
attribute is selected:
The Acknowledge bit tag is assigned to the same block
as the Acknowledge Return Message Number tag.
Function Key write tags are assigned to the same block
as the Function Key Return Message Number tag.