Siemens SITRANS FEC920, Руководство пользователя

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FEC920: USER GUIDE
Page 50
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September 18
Horizontal Trend, Vertical Bar, Horizontal bar, Numeric, Alarm Panel, Dual Loop, Cascade, Modbus Master,
EtherNet/IP.
As for Vertical Trend, above. By default some display modes are disabled (gray cross). In
order to enable such display modes the relevant cross is highlighted using the up/down
arrow buttons, and the scroll button then used to change the gray cross to a white tick.
The tick associated with the selected home page is always gray.
Trend Background Allows the user to select black (default), white dark gray or light gray as the ‘chart’ color.
History Background As above for ‘Trend background’, but for history displays.
H.Trend Scaling
As described in Section 5.4.2, by default, the scale for horizontal trends appears at the left
edge of the chart for a few seconds before the chart expands leftwards to occupy the scale
area. Setting ‘H.Trend Scaling’ to ‘Permanent’, ensures that the scale remains
permanently on display.
Faceplate cycling Allows the default faceplate cycling state to be defined as ‘On’ or ‘Off’ (Section 5.3.5)
Number Format Rounded:
Truncated:
USB Auto Scan If set to ‘Yes’, bar code data messages are automatically generated and appear on the
display and in the Message list without operator intervention. If set to ‘No’, the Message
appears on the screen for editing and/or confirmation, before being displayed, etc. Section
11.2 provides further details.
There is a new parameter been added to the Instrument. Display list - Number format.
The options are to ‘Round’ or ‘Truncate’ values. On the previous firmware releases of the
FEC920 , numbers
were truncated (in the same way as the 6000).
From firmware versions V3.01 and above there is an option to allow numbers to be rounded. The reason for
this is driven primarily from a control point-of-view. With truncation, it is quite likely that the PV will look as though
it never settles onto setpoint. The rounding/truncation affects the UI display and MODBUS scaled integers, the
underlying numbers are not affected, nor the values saved in the history files. Over MODBUS comms, all
floating point parameters that are read via scaled integer comms will take note of the configured setting for
rounding or truncating and reflect this. On the UI, ALL floating point values rendered will adhere to the
configured setting of rounding or truncating.
Note: Some display modes are available only if the relevant option is fitted.
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