Siemens simatic et200sp Manual page 68

Limit monitoring
9.2 Influence of hysteresis and delay time on limit monitoring
The following figure shows the value-over-time for two measured values using the example
of a high and low limit as well as the influence of hysteresis and delay time on the counting
of the limit violations.
Image 9-1
See also
How limit monitoring works (Page 66)
Minimum and maximum values (Page 71)
68
Configured limit.
Configured delay time. Is taken into consid-
eration during coming and going.
Hysteresis range. Only considered for out-
going.
Value-over-time for which the limit is moni-
tored.
Edge change. Counter for limit violations is
incremented by 1. If parameterized, a hard-
ware interrupt is triggered.
Influence of hysteresis and delay time on the limit
Signal wave
①
Limit monitoring with hysteresis and delay
time
②
Limit monitoring with hysteresis, but without
delay time
③
Limit monitoring without hysteresis, but with
delay time
④
Limit monitoring without hysteresis and
delay time
Analog input module AI Energy Meter 480VAC ST (6ES7134-6PA20-0BD0)
Manual, 12/2015, A5E36061895-AA