HART Multiplexer System KFD*-HM*-16
Operation
2018-04
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7.1.7 Variant of the Scan Function (Special Scan Function)
The special scan function (command 149, function 2) uses an additional parameter that
defines the minimum length of expected data bytes. This parameter can be different for each
signal loop but it must be set for each signal loop to be scanned.
The scanning process itself takes place as described in the chapter above. However, the
response of the field device is compared with the expected data length. If the length of the
response is below the specified minimum data length, the response is rejected. If the minimum
data length is 0, the response is always stored.
7.2 Software Functions
7.2.1 Field Device List
Scanning Signal Loops
1. Use the mouse to double-click the multiplexer master KFD2-HMM-16 in
the project window.
2. In the editing window, open the Device actions > Scan loops menu.
The Scan loops for field devices window is displayed.
In the Scan loops for field devices window, you can start a scan to identify all field devices
connected to the multiplexer master. Proceed as follows:
• In the left-hand area, select the signal loops that you want to search. If you select a slave,
all signal loops of the slaves are scanned.
• Selecting the Scan selected loops button starts the scan of the signal loops.
The scan may take several minutes.
Once the signal loops have been scanned, you can find more information about the connected
field devices in the field device list, see chapter 7.2.2.
Note!
The special scan function cannot be parameterized via the DTM. It can only be parameterized
via HART commands from the host.
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