Endress+Hauser Fieldgate FXA520, Operating Instructions Manual

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Fieldgate FXA520 6 Configuring the Fieldgate
Hauser 61
6.3.4 Scan
Scan
sets up the HART communication parameters and the conditions for starting a scan of the
devices connected to the Fieldgate.
HART Parameters
1 If not already selected, press
Switch to Administration Mode
and log in as administrator.
2 Press
Settings => Scan
: the Scan Control, HART parameters dialog appears:
3 Enter the parameters you require – their significance is described in the table below:
– The default parameters can usually be used unchanged
– Press
"Send"
to download the user parameters to the Fieldgate.
Device Scan Control
4 Scroll down to the Device Scan Control parameters
5 Enter the parameters you require – their significance is described in the table below:
– Press
"Send"
to download the user parameters to the Fieldgate.
Parameter Description
Master Type
Select HART master type, normally Primary
• Set to Secondary if Fieldgate is operating with a PLC using HART communication
Retries
No. of tries to establish HART communication before a communication error is signalled
Preambles
No. of preambles used to establish HART communication
Highest HART Address
For HART multidrop, device address range scanned
– Values above 15 are only applicable to HART Version 6
– Do not set unneccesarily high values – this results in increased scan times
Multiplexer speed/
RS485
Baudrate for RS-485 communication: all devices must operate at the same rate
Multiplexer loop search
mode
Address range to be scanned per multiplexer channel, normally "single analog"
– Use Single unknown only if a multidrop bus is connected to the multiplexer channel
Parameter Description
Device Scan Cycle Time
Set a scan time from "continuous" to "1 day" from the drop-down menu
– Use e-mail/log cycle if a scan is to be made on e-mail or logging events only
Device Power Up Time
Set a value determined by the slowest device between 2 s and 5 min, default 20 s, from
the drop-down menu, after which a stable measured value can be scanned
Power Down ...
Check this box if the relay is used to switch off the power to the devices between scans
– If the box is not checked, the relay acts as an alarm relay for the Fieldgate FXA520