Captures the value of a tag at a specific event
Sometimes a specific duration of events is of interest and it is necessary to display the duration of a specific event as a new tag in the focus diagram.
Here are 4 ways to display the duration of an event as a new tag.
Create a Tag Builder Formula tag that shows the values (profile) if the event of interest (e.g. a phase) occurs in a discrete/ string tag.
Formula:
if(a="PHASE2", VALUE, 0)
Variable mapping:
a = discrete/ string tag (no shift);
VALUE = analog tag (no shift)
In the example the resulting tag shows the temperature profile during phase 2 in a batch process.
Create a Tag Builder Formula that shows the value if the event of interest (e.g. a transition) occurs.
Formula:
if(and(now = "PHASE2", before = "PHASE1"), VALUE, 0)
Variable mapping:
now = discrete/ string tag (no shift)
before = discrete/ string tag (shift: 1s)
VALUE = analog tag (no shift)
In the example the resulting tag shows the start temperature of phase 2 in a batch process. The if-function condition is true, if the data shows a transition from PHASE1 (now) to PHASE2 (before).
Create a Tag Builder Formula that shows the values (profile) if the event of interest (e.g. a phase) occurs in an analog tag.
Formula:
if(and(LEVEL>10, LEVEL<30), VALUE, 0)
Variable mapping:
LEVEL = analog level tag (no shift);
VALUE = analog tag (no shift)
In the example the resulting tag shows the temperature profile during phase 2 in a batch process.
Create a Tag Builder Formula that shows the value if the event of interest (e.g. a transition) occurs.
Formula:
if(and(LEVEL_now>10, LEVEL_before<10), VALUE, 0)
Variable mapping:
LEVEL_now = analog level tag (no shift);
LEVEL_before = analog level tag (shift: 1min)
VALUE = analog tag (no shift)
In the example the resulting tag shows the start temperature of phase 2 in a batch process. The if-function condition is true, if the data shows a transition from PHASE1 (now) to PHASE2 (before).
