Rockwell Automation 1794-OE8H FLEX I/O HART Analog Modules User Manual - Manual (Page 32)

Publication 1794-UM063A-EN-P - March 2006
2-8 Configurable FLEX I/O Analog Module Features
Analog Digital State
You can configure your FLEX I/O analog output modules to work in an
analog mode or digital mode using the Analog Digital State feature. Depending
on which state you choose for your application, additional parameters (see the
descriptions of Analog Fault State and Digital Fault State on page 2-8) must be
configured for your module to react to fault conditions.
Set the Analog Digital State bit in your programming software to 0 for your
module to operate in an analog state. Set the bit to 1 for your module to
operate in a digital state. A selection bit is available to each channel.
Analog Fault State
The Analog Fault State feature determines how your I/O module reacts to
faults when a channel is used in analog mode. After a fault condition occurs,
the module may got to minimum value, maximum value, hold last state or use
analog fault state value.
Use your programming software to set the Analog Fault State bits on the
I/O module for one of the following fault reactions:
• 0 = minimum value
• 1 = maximum value
• 2 = hold last state
• 3 = use analog fault state value
You can set these parameters independently for channels 0 to 1, 2 to 3, 4 to 5,
and 6 to 7.
Analog Fault State Value
Specifies the fault state value of the analog output data to the module. Specific
format is controlled by the Module Data Format Control parameter. This data
is used when the channel is in analog output mode and the analog fault state is
configured to use analog fault state value.
Digital Fault State
The Digital Fault State feature determines how your I/O module reacts to
faults when a channel is used in digital mode. After a fault condition occurs,
the module may reset channel outputs or hold last state of the outputs.
Use your programming software to set the Digital Fault State bit to 0 to reset
outputs. Set to 1 to hold last state of the outputs after a fault occurs. This
feature is available on a per channel basis.