Analog input module AI Energy Meter 480VAC ST (6ES7134-6PA20-0BD0)
66 Manual, 12/2015, A5E36061895-AA
How limit monitoring works
Introduction
The AI Energy Meter 480VAC ST supports monitoring of parameterizable low
high limits
for up to 16 analog measured or calculated variables.
You can also define multiple limits for each measured or calculated variable, in order to
define a high or low value range.
The measured value data record 150 returns the current status limit violations and per limit
one counter that displays the number of limit violations. In addition, a hardware interrupt may
be generated for each limit violation.
The status of the limit violations can also be evaluated in the user data variant 240 (F0
H
) or
via the user-defined user data variant via the measured value ID 65509.
With activated limit monitoring you can already detect any irregularities in the measured
value acquisition already in field level.
All the counter states of the module are stored retentively in the Energy Meter. After an
interruption (e.g. Power System Off → Power System On), the counting resumes with the
retentively stored values.
You configure the following limit monitoring settings in STEP 7:
● Measured variable that is to be monitored.
● Activate / Deactivate limit monitoring.
● High or low limit values.
● Delay time and hysteresis for each limit.
● Activate / Deactivate hardware interrupts at limit violation.
● Measured value that is subject to limit monitoring.
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