Rockwell Automation 1336T Function Block Prog. Manual, Series A/B - Manual (Page 153)

5–37 Block Transfer Services
1336 FORCE — 5.9 August 1995
Output values that are beyond the number of valid linkable input
nodes are ignored. Therefore, if a block type has only one linkable
input and five links are written, only one is established.
Currently, the packet number must be zero.
Currently, you can disregard the file number. The file numbers are
for future use. For now, you should set the file number to 0 for a
linear parameter output and 1 for a function block node.
Write Block Link
(continued)