Rockwell Automation 1794-OF8IH FLEX Isolated Input/Output HART Analog Modules - Manual (Page 63)

Publication 1794-UM065B-EN-E - September 2010
1794-IF8IH and 1794-OF8IH Configuration 51
HART Status Fields
The 1794-IF8IH supports two connections for pass through messages. Pass
through messages provide a user the ability to send HART messages to the
HART device by passing through the I/O Module. In additional, HART
device information automatically gathered by the I/O module may be accessed
through this interface.
The 1794-IF8IH provides 8 queues for each of the two connections. This
allows each connection to have up to eight messages pending at any given
time, one for each channel. HART pass through message implements a
timeout which is fixed at twenty 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 Failure (8 of 1 bit each)
This bit indicates each time there is a HART communication failure detected,
between the module and the HART field device (HART FD), on the channel.
This failure could be timeout, response checksum, parity, framing, HART FD
disappears, HART FD mismatch (from device detected at last rebuild), for
example. If there is a failure the appropriate channel's bit is set. The bit is not
latched.
0x95 Channel 5 Calibration Error
0x96 Channel 6 Calibration Error
0x97 Channel 7 Calibration Error
0xA0 Channel 0 Internal Bus Com Error
0xA1 Channel 1 Internal Bus Com Error
0xA2 Channel 2 Internal Bus Com Error
0xA3 Channel 3 Internal Bus Com Error
0xA4 Channel 4 Internal Bus Com Error
0xA5 Channel 5 Internal Bus Com Error
0xA6 Channel 6 Internal Bus Com Error
0xA7 Channel 7 Internal Bus Com Error
Diagnostic Status Value: 0 Channel Failure