Section 3 Run-time Operation
AO895
3BSE027630-600 B
113
•
Enable scan status
This function turns on the scanning.
The scanning function is implemented to monitor the presence of field
instruments. When the scanning is enabled, all the instruments of the
instruments list are scanned with HART command 1. A different channel every
5s. If an instrument does not reply the DISAPPEARED and SEARCHING bits
related to that instrument are set, else the SCAN_ENABLED will be set. For
the instrument that is not replying the module begins to scan that instrument
with HART command 0. If there is a reply to command 0, the module verifies
if it comes from the original instrument:
–
If it does, the APPEARED bit is set, the DISAPPEARED and
SEARCHING bits are cleared and the module restarts the normal
scanning activity.
–
If it does not, the MISMATCHED bit is set, the DISAPPEARED bit is
cleared and the module keeps on searching the instrument with
command 0.
•
Disable scan status
This function turns off the scanning.
Gateway parameters
•
Number of instruments in list
Shows the number of instruments that the module has found on its channels. If
an instrument is added in run-time then the module has to be reset to find the
new instrument and add it to its instrument list. This can be done by using the
service function "Perform master reset". The maximum of instruments are one
per channel which means eight total on the module.
•
Number of instruments scanned
If the scan option is enabled the module will try to scan all elements that are in
the instrument list. See
for more information about the
scanning.
•
Delayed response, primary master
Содержание S800 I/O
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