Rockwell Automation 1794-OF8IH FLEX Isolated Input/Output HART Analog Modules - Manual (Page 86)

Publication 1794-UM065B-EN-E - September 2010
74 1794-IF8IH and 1794-OF8IH Configuration
Range:
If the Fault Mode is 0=Disable: 0=Output 0 mA = OFF, 1=22 mA = ON.
If the Fault Mode is 1=Wire off fault detection enabled: 0=Output
500 µA=OFF, 1=22 mA=ON.
See Analog/Digital Output Mode (8 of 1 bit each) on page 67.
Global Reset (1 of 1 bit)
This bit resets all latched fault alarms. It acts in conjunction with the Latch
Retry parameter. If any channel faults occur, the Latch Retry parameter can be
set to cause the fault to be latched and the output to go to its fault state value if
the Local Fault mode bit is set.
This is an edge triggered signal. It must first be set to the "1" state, reset will
then occur on the "1" to "0" transition.
Range: 0=Normal, 1=Reset.
Fault (1 of 1 bit) and Run/Prog (1 of 1 bit)
Fault bit = Signal from the adapter to the module that communications has
been interrupted with the network.
Prog/Run bit = Signal from the adapter to the module of the processor mode.
These two bits are generally used together.
When the adapter and I/O are first powered-up, the Fault bit is set to '0', by
the adapter. On power-up any module outputs remain OFF (0 mA out) or
reset.
When the Fault bit is a '1', the outputs follow the data specified in output data
words if the Prog/Run bit indicates the processor is in the Run mode '1'.
When the Fault bit is a '0' or Prog/Run bit indicates the processor is in the
Program mode '0', the outputs follow the data specified in fault state
configuration data words. The following is a truth table to explain this in more
detail.
Prog/Run Fault Description
1 1 Module's outputs follow the output data table
all other states Module's outputs follow Fault State Values