Rockwell Automation 1336T Function Block Prog. Manual, Series A/B - Manual (Page 125)

5–9 Block Transfer Services
1336 FORCE — 5.9 August 1995
The Total Number of I/O Nodes message provides the number of
nodes used in the function block application currently running in the
drive.
PLC Block Transfer Instruction Data
BTW Instruction Length: 3 Words
BTR Instruction Length: 4 Words
Header
Word 1
PLC Decimal Value
3841
–32768
Message Structure
Header
Word 2
Header
Word 3
PLC Request –– Block Transfer Write
Header Word 1
Header Word 2
Header Word 3
–32768
0
Data
Word 4
0
PLC Decimal Value
3841 –– Message OK
–28927 –– Message Error
Number of Nodes
in Execution List
Drive Response –– Block Transfer Read
Dec
Message Operation
The PLC requests the number of nodes that are associated with the
active execution list in the drive. The drive response indicates the
total number of nodes used by all function blocks in the execution
list.
Example
In this example, the PLC has requested the total number of nodes
used. The drive responds that 24 nodes are used in the current
application.
1 0
N10:10
2 3 4 5 6 7 8 9
N10:90
BTW
Data File
BTR
Data File
Data Format
-32768
-32768 24
0
0
3841
3841
Application Status
Services:
Total Number of I/O Nodes