Rockwell Automation 1336T Function Block Prog. Manual, Series A/B - Manual (Page 149)

5–33 Block Transfer Services
1336 FORCE — 5.9 August 1995
The Write Block Value message writes the 16 bit data values to the
specified function block. All the values for the entire function block
are sent.
PLC Block Transfer Instruction Data
BTW Instruction Length: 36 Words
BTR Instruction Length: 4 Words
Message Length
0
Header
Word 1 Header
Word 1
8F05
80ID
PLC Decimal Value
0F05 –– Message OK
Status Word
80ID
8F05 –– Message Error
Message Structure
Header
Word 2
Data
Word 3
Header
Word 2
Header
Word 3
Data
Word 4
0
PLC Request –– Block Transfer Write
Drive Response –– Block Transfer Read
Packet Number Data
Word 4
Node 0 Value
Node 1 Value
Data
Word 5
Data
Word 6
•
Node 31 Value
Data
Word 36
•
•
•••
ID = the block ID number
0
Message Operation
The data buffer contains the packet number and up to 32 valid node
values. Therefore, you must pad the length of the buffer with zeros
to reach the 32 value length if the function block has less than 32
nodes.
Currently, the packet number must be zero.
If any of the values are out of range for any given node, the service
will fail.
Values beyond the valid number of inputs for the given block ID are
ignored.
Node Adjustment:
Write Block Value