
Reset energy counters after installation!
As soon as the module is supplied by the DC 24V power section supply,
the measurement is started and the counting of the energy counters is
continued with the retentive stored counter values. The measurement is
not interrupted by STOP or RESET of the CPU respectively the bus cou-
pler. After installing the module the energy counters should be reset by
CMD-Frame.
Chapter 3.27.7.2.5 ‘CMD Frame’ on page 327
3.27.3
Basics
3.27.3.1
Terms
A
measurand
is a physical quantity that can be measured such as current, voltage or
Chapter 3.27.6 ‘Measurands’ on page 316
A
measured value
is a value of a measurand, which is determined by measurement or by
calculation.
In the module each
measurand
one
ID
is assigned. The access to the measured value of
a measurand happens by means of the corresponding
ID
As soon as the module is supplied by the DC 24V power section supply, the measure-
ment is started and the counting of the energy counters is continued with the retentive
stored counter values. The measured values of all the measurands are stored in the
module with one record set ID
DS-ID
. The following must be observed:
n
All measured values with the same
DS-ID
come from the same measurement and are
consistent.
n
By specifying the
DS-ID
you can address the individual measured values of the same
measurement.
n
The
DS-ID
covers the values 1 ... 15. The start value can freely be selected.
n
To refresh the measured values the
DS-ID
is to be incremented by 1. The value 15
must be followed by 1.
n
If the
DS-ID
is incremented and there is still no new value available, the current value
is returned with an error.
‘Status communication’ on page 319
n
DS-ID
= 0 - Auto increment mode
–
With
DS-ID
= 0 there is a request with
auto increment mode
. Here the module
always returns the current measured value. As soon as a new measured value is
available, here the
DS-ID
is incremented by one within the values 1 ... 15. If there
is no new measured value available, the
DS-ID
is not changed and a error mes-
‘Status communication’ on page 319
n
The uniqueness of a measured value always consists of the
ID
of the measurand and
the
DS-ID
.
Measurand
Measured value
ID
DS-ID
VIPA System SLIO
Analog Input
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