User Manual

Logical I/O blocks
Input blocks
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CM110664en_07 253 | 353
● Change of state messages (events / system events)
● Runtime totalization and maintenance messages
● Hardware mapping
Pulse converter (pulse counter)
The pulse converter object cumulates pulses for a meter. The Pulse converter
object is used where meter values already manipulate in a meter object or
where changes of values are required to further process control programs.
Applications include: Establishing 24-hour/7-day/monthly meters, transmission
by the minute of meter values to peak load programs, etc. Precision and round
off error based on real arithmetic is possible.
The counter value is scaled as a REAL number directly in the object using the
scaling factor. COV forming the Present_Value can be value or time-related and
a timestamp with the logged time is always provided with the Present_Value.
Reduction of Present_Value by a value (subtraction) is supported as a
standard. You can set it to a pre-defined value using a trigger function
(proprietary expansion).
The Pulse Converter object can be used in two different manners: Counting or
metering. The type of application is parameterized using the FnctMod
parameter.
The referenced object, e.g., an external device provides the pulse value:
● Present_Value for the pulse converter object represent the pulse count of
the referenced object: The difference to the last read value is added for
each record.
● Present_Value can be set via the system.
● After start-up, the pulse converter object encompasses the last stored
counter value:
● After a change in counter, the pulse converter object encompasses a false
counter value.
● Typical application: On-board I/O with pulse logging.
The referenced object, e.g., an external device provides the absolute pulse
value:
● Present_Value from the pulse converter object represents the absolute
counter value of the referenced object.
● Under no circumstance may the Present_Value be set via the system.
● After start-up or a change in counter, the pulse converter object after
includes the correct counter value.
● Typical applications:
– Access to an accumulator or pulse converter object is another BACnet
device
– I/O Open module or M-bus with counter value integration
– Integration of a device via LON
● Incorrect applications: I/O module with pulse recording
Specific properties