Siemens SITRANS FEC920, Руководство пользователя

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FEC920: USER GUIDE
Page 203 September 18
10.2 COUNTER EXAMPLE
This example shows how to set up a counter to be incremented each time Channel 1 Alarm 1 becomes active,
and reset each time channel 2, alarm 1 is acknowledged. For this example, Virtual Channel 3 will be configured
as the counter, with a preset value of 0.
1.
At Channel.1.Main, set:
Type = test
Test Signal = Sine 4 min.
Scale Low = 0
Scale High = 100
2. At Channel.1.Alarm1, set:
Type = Abs Hi
Threshold = 50
Latch = None
3. At Channel.2.Main, set:
Type = Test
Test Signal = Sine 40 min.
Scale Low = 0
Scale High = 100
4. At Channel.2.Alarm 1, set:
Type = Abs Hi
Threshold = 90
Latch = Manual
5. At Virtual Channel.3.Main, set:
Type = Counter
Operation = On
Input = 1
All the other parameters can be left at their defaults.
6. Still at Virtual Channel 3 (Main), use the up/down arrow buttons to highlight ‘Trigger’. Press and hold the
scroll key. The top level User Wiring page appears, this time with a ‘From Source’ tab as well as the ‘To
Destination’ tab of example 1. This is because this parameter is read/write, whereas Alarm Active is read
only (i.e. its value may be read but not changed).
7. Use the up (or down) arrow button to select the ‘From Source’ tab.
Figure 131 Wiring a counter: part 1
User Wiring
To Destination From Source
Add new wire
Good
0
1
No
0
No
Status
Resolution
Units
Input
Preset
Preset Value
Trigger
Virtual Channel.3.Main
User Wiring
To Destination From Source
Add new wire
Virtual Channel.3.MainTrigger
Virtual Channel.3.Main.Trigger
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