Rockwell Automation 20-COMM-R Remote I/O Adapter - Manual (Page 54)

4-18 Using Discrete and Block Transfer I/O
20-COMM-R Remote I/O Adapter User Manual
Publication 20COMM-UM004D-EN-P
Block Transfer Write Example
The following data is used for this example.
• Rack 1
• Group 4 (upper half rack)
• Slot 0 (always 0)
• Control Block N10:0 (user defined)
• Data File N22:0 (user defined)
• Buffer File M0:x.200 (Block Transfer Writes always start with M0,
where x is the slot in which the 1747-SN scanner card is in. In this
example, the 1747-SN card is in slot 2.)
• Requested Word Count is 18 or less (see See Figure 4.1 on page 4-2 or
See Figure 4.2 on page 4-3 )
• Transmitter Word Count (always 0)
• Control Block Length (always 3)
Important: Each Block Transfer needs to be offset by 100 (M0:x.200) and
the default is 3300 words, so you can perform up to 33 Block
Transfers. See the advanced configuration for your 1747-SN
scanner card under channel configuration.
Figure 4.12 SLC 500 Series C, FRN 3.xx and Higher, Example Ladder Logic for
Block Transfer Write