Rockwell Automation 1797-IRT8 FLEX Ex Thermocouple/RTD/mV Input Module User Manual - Manual (Page 10)

Publication 1797-6.5.2 - February 2001
1-2 About the FLEX Ex Thermocouple/RTD/mV Input Module
How FLEX Ex
Thermocouple/RTD/mV
Modules
Communicate with
Programmable
Controllers FLEX Ex thermocouple/RTD/mV modules provide best utility when
used with ControlNet Ex products on the ControlNet network. Data
connections are established between the I/O module and an
Allen-Bradley programmable controller to transfer information
between the two at a scheduled rate.
Input module information is then automatically made available in the
PLC data table.
When the data connection is established, configuration information
for the module is automatically transferred to it via the network.
Events following Power-Up
You must apply intrinsically safe +/-V power to your FLEX Ex I/O
modules. The following sequence of events occurs after power has
initially been applied to your module:
1. The module begins an interal diagnostic check. The channel 0 LED
indicator turns ON to indicate the check has begun. The indicator
turns OFF when the check is finished.
2. After the diagnostic check, module configuration information,
selected by the user and downloaded over the network, is applied
by the module.
For more information on configuration options, see Chapter 2.
3. Following the module configuration download for the 1797-IRT8
module, the module begins producing runtime data for the PLC.
4. If any diagnostics or alarms are generated during normal module
operation, the data is returned to the PLC.
Features of Your Module The module label identifies the keyswitch position, wiring and
module type. Use the removable label to note individual designations
per your application.