Rockwell Automation 1715-OF8I Redundant I/O System User Manual - Manual (Page 147)

Rockwell Automation Publication 1715-UM001C-EN-P - March 2014 147
Using 1715 Analog I/O Module Features Chapter 4
Operating Modes This section discusses operating modes for the analog input and output modules.
Online Mode
When fully online and operational, each channel provides a regulated current
over a 1…24 mA range for the analog input module and a 0…24 mA range for the
analog output module. The current values are set for each channel by the
commanded values received from the running application. The module
indicators are GREEN, and with all module indicators GREEN, none of the
channels are in the failed state; however, the channel indicators depends on the
individual channel status.
In the online mode, you can add a module to a group (in a duplex TA), or change
a module in a pair, with no impact on the reported channel values or deviation
between the regulated current. The unaffected module of a pair provides the full
output values.
Offline Mode
The module is in the Offline mode when it is installed, but is not locked in
position (locking screw not engaged). All channel outputs are off and the channel
indicators are OFF. The Healthy indicator is GREEN and the Ready indicator
goes OFF, while the Run indicator is RED. The module enters the Shutdown
mode when locked in position.
When a critical power fault is detected, the module automatically enters the
Shutdown mode and the Healthy indicator goes RED before it goes into Ready
mode.
Shutdown Mode
In the Shutdown mode, all channels regulate their output to shutdown settings
for each channel. The Ready and Run indicators are RED.
In a group arrangement, one module can be in shutdown while the other can
continue to be online and in the Run mode and regulate the output according to
the commanded values.
When the module is communicating with the processors in Shutdown mode, it
transitions to the Ready mode. If there is an application running it transitions to
the Recover mode.