Example: dSt with window function:
Function preset counter
40
Flow rate
Q
reaches 0.5% FV
→
dSt starts, the output becomes active.
dSt has elapsed,
Q
has reached the acceptable range
→
the output
remains active.
Q
flow exceeds SP (leaves the acceptable range)
→
the output is reset.
Q
falls below SP again
→
the output becomes active again.
Q
falls below rP (leaves the acceptable range)
→
the output is reset again.
Q
reaches 0,5% FV again
→
dSt starts, the output becomes active.
Q
reaches acceptable range, the output becomes active.
dSt has elapsed, flow has not reached the acceptable range
→
the
output is reset.
1
2
3
4
5
6
7
8
t
SP
Q
dSt
rP
0,5%
1
0
1
0
1
dSt
2
3
4
5
6
7
8
Fno
Fnc
With manual reset (for time-
in
dependent quantity monitoring)
• Settings:
ImPS
= quantity x,
ImPR
= no,
rTO
= OFF.
• When the quantity x is reached output 1 becomes active and remains on
until the meter has been reset manually (
→
page 35, parameter
rTo
).
With auto reset (for time-dependent quantity monitoring)
• Settings:
ImPS
= quantity x,
ImPR
= no,
rTO
= time t.
• If the quantity x is reached during t output 1 switches and remains switched
until the meter is reset manually.
• If the quantity x has not been reached after the time t the meter is
automatically reset and counting starts again; output 1 provides no signal.
