Rockwell Automation 1336T Function Block Prog. Manual, Series A/B - Manual (Page 158)

5–42 Block Transfer Services
1336 FORCE — 5.9 August 1995
The Write Node Value operation writes a value to a specified function
block node.
PLC Block Transfer Instruction Data
BTW Instruction Length: 4 Words
BTR Instruction Length: 4 Words
Header
Word 1
PLC Hex Value
8F01
8NID
Message Structure
Header
Word 2
Header
Word 3
PLC Request –– Block Transfer Write
Header Word 1
Header Word 2
Header Word 3
0
0
PLC Hex Value
0F01 –– Message OK
8F01 –– Message Error
ID N
8NID
High Byte Low Byte
Node Value Data Word 4
Drive Response –– Block Transfer Read
where:
N = the node number
ID = the block ID number
Hex
Header
Word 4
Status Word
Message Operation
Word 3 specifies the function block node.
❒ ID, specified in the low byte, indicates the block ID number.
❒
N, specified in the high byte, indicates the node number.
The value in word 4 is written to this node. If this node is linked to
another function block node or drive parameter, the parameter output
value overwrites the node value. If the most significant bit of word 2
is set, word 4 contains an error message.
Example
In this example, a value of 4 is written to node 1 of the function
block with a block ID number of 11
Dec
(0B
Hex
).
1 0
N10:0
2 3 4 5 6 7 8 9
N10:90
BTW
Data File
BTR
Data File
Data Format
810B 4
810B
0
0
8F01
0F01
Node Adjustment:
Write Node Value