Publication 1794-6.5.12 - November 1997
3-2 Programming Your Thermocouple/RTD Input Module
PLC-2 Family Processor
The 1794 Thermocouple/RTD/mV modules are not recommended for use
with PLC-2 family programmable controllers due to the number of digits
needed for high resolution.
Important: The Thermocouple/RTD input 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.
PLC-3 Family Processor
Block transfer instructions with the PLC-3 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. The same block transfer
control file is used for both the read and write instructions for your
module. A different block transfer control file is required for every
module.
Allen-Bradley PLCs
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