Carbolite nanodac - Manual (Page 84)

nanodac™
MC27 –EN– 1.04
82
7.1 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 4.2a Wiring a counter: part 1
Status
Resolution
Units
Input
Preset
Preset Value
Trigger
Virtual Channel.3.Main
Good
0
1
No
0
No
Virtual Channel.3.Main Trigger
User Wiring
From source To destination
Add new wire
Virtual Channel.3.Main Trigger
User Wiring
To destination
Add new wire
From source