Manual

Chapter 3
Communicating with Your Module
3-9
BlockTransfer Write
You can generate all block-transfer writes to your 1771-TCM module thru
a single block-transfer write instruction. Enter the block length as 64
words. Write your ladder logic so that when you want to send a particular
block of data to the 1771-TCM module, you first send it to the 64-word
block addressed by the BTW instruction and then use the BTW instruction
to send it to the module.
Configuration Block for Loop 2
23 words
Configuration Block for Loop 1
23 words
Configuration Block for Loop 3
23 words
Configuration Block for Loop 4
23 words
Configuration Block for Loop 5
23 words
Configuration Block for Loop 6
23 words
Configuration Block for Loop 7
23 words
Configuration Block for Loop 8
23 words
Gains Block
57 words
Calibration Write Block
20 words
64word block
addressed by the
blocktransfer
write instruction
Dynamic Block
34 words
1771TCM ModulePLC Data Table
Blocktransfer Write
Step 1 
You first send a particular
block of data it to the 64word
block addressed by the BTW
instruction.
Step 2 
You then use the
BTW instruction to
send the block of
data to the module.
At the beginning of each block is a block identification code that you use
to tell the module which block it is. The module automatically uses only
the number of words appropriate for that particular type of block.