Rockwell Automation 1794-ID2 U.MNL INCREMENTAL ENCODER - Manual (Page 38)

3–2 Programming Your Incremental Encoder Module
Publication 1794ĆUM015B-EN-P - May 2001
PLCĆ2 Family Processor
The 1794 incremental encoder module is not recommended for use
with PLC-2 family programmable controllers due to the number of
digits needed for high resolution.
Important: The incremental encoder module functions with
reduced performance in PLC-2 systems. Because the
module does not support BCD and the PLC-2 processor
is limited to values of 4095 (12 bit binary), many values
returned in the BTR file may not provide meaningful
data to the PLC-2 processor.
PLCĆ5 Family Processor
Block transfer instructions with the PLC-5 processor use a control
file and a data file. The block transfer control file contains the data
table section for module location, the address of the block transfer
data file and other related data. The block transfer data file stores
data that you want transferred to the module (when programming a
BTW) or from the module (when programming a BTR).
The programming terminal prompts you to create a control file when
a block transfer instruction is being programmed. A different block
transfer control file is used for the read and write instructions
for your module.