140 Rockwell Automation Publication 1715-UM001J-EN-P - December 2020
Chapter 5 Using 1715 Analog I/O Module Features
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 that are 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 depend 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 that is 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.
Ready Mode
All channels are off when in the Ready mode, the Ready indicator is GREEN
and the Run indicator is RED while the channel indicators are OFF. When an
application is started, the module transitions to the Run mode.
When a module loses communication with the processor, then it transitions
back to the Shutdown mode.
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