Rockwell Automation 1794-OF8IH FLEX Isolated Input/Output HART Analog Modules - Manual (Page 85)

Publication 1794-UM065B-EN-E - September 2010
1794-IF8IH and 1794-OF8IH Configuration 73
The 1794-OF8IH module provides 8 queues for each of the two connections.
This allows each connection to have up to 8 messages pending at any given
time, one for each channel. HART pass through message implements a
timeout which is fixed at 20 seconds.
The first connection is provided for a ladder logic user. The following status
bits are provided to simplify ladder logic. The second connection does not
have status bits provided in the RTD. It can obtain this status by implementing
polling messages using the pass through message interface.
HART Current Fault (8 of 1 bit each)
Alarm signal for HART Current Fault, indicating the HART data value is
outside the HART Current Fault limit percentage. Active when limit is
exceeded. The analog measured current is compared with the digital current
value, read out dynamically via the HART interface. Active when limit is
exceeded. See HART Current Fault Limit (8 of 5 bits) on page 65.
Range: 0=Normal, 1=Fault detected
HART Transmitter List (8 of 1 bit each)
Indicates a HART transmitter has been detected on this channel, during the
last rebuild.
Range: 0=A HART Transmitter was not detected, 1=A HART Transmitter
was detected.
Real Time Data (RTD)
Profile, Output Parameters Analog Output Data (8 of 16 bits each)
Specifies the value of the analog output data to the module. Specific format is
controlled by Module Data Format Control parameter. This data is used when
the channel is in analog output mode.
Range: See Analog Data Format (8 of 4 bits each) on page 65.
Digital Output Data (8 of 1 bit each)
Specifies the value of the digital output data to the module. This data is used
when the channel is in digital output mode.