Publication 1794-6.5.12 - November 1997
1-2 Overview of FLEX I/O and Your Thermocouple/RTD/mV Input Module
Typical Communication Between an Adapter and a
Module
ADAPTER
ACTIVE FAULT
LOCAL
FAULT
24VDC
POWER SUPPLY
RIO ADAPTER
1794-ASB
Allen-Bradley
1
The adapter transfers your configuration data
to the module using a BTW.
Flexbus
External devices transmit
analog signals to the module.
2
The module converts analog
signals into binary format and
stores these values until the
adapter requests their transfer.
3
Your ladder program instructs the
adapter to perform a BTR of the values
and stores them in a data table.
4
The adapter and module determine
that the transfer was made without error
and input values are within specified
range.
5
Your ladder program can use and/or move the data (if valid)
before it is written over by the transfer of new data in a
subsequent transfer.
6
Your ladder program performs BTWs to the module only when you
power it up, or any time you wish to reconfigure the module.
7
IN 0 IN 2 IN 4 IN 6IN 1 IN 3 IN 5 IN 7
TC RTD INPUT 8 CHANNEL
3
1794-IRT8
Allen-Bradley
PWR
FFFFFFFF
Allen-Bradley PLCs
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