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Parameters
Value valid
Error
5.8.4
Flow calculation
Function
Each time it is run through the block forms the difference of the current value at the "Counter
value" input and the value from the previous run through.
This difference divided by the time (s) between the current and last run through produces the
current "Flow" (volume flow) as amount per time unit (Q/t) that is included in the calculation
of the "Pulse weighting" parameters.
The output "Value valid" is set to 1 as soon as the block has been run through twice and the
difference could be calculated once.
Via the "Reset" input parameter, the output parameters are reset to 0.
The block performs the calculation in each basic cycle.
Parameters
Parameters
Input parameters
En
Reset
Counter value
RTU303xC
Operating Instructions, 06/2019, C79000-G8976-C382-06
Tag type / range of
Description
values
Digital output / bit
Tag in which the the validity identifier of the frequency
memory
value calculated by the block is output:
•
•
Digital output / bit
Error display:
memory
•
•
Tag type / range of
Description
values
Enable parameter, see section Often used parameters
(Page 252).
True / False
Resets the output "Flow" to 0 on a positive edge (0 → 1).
Digital input / output /
If "True" is set constantly, the output is permanently reset
bit memory
to 0.
STATUS_ERROR
With the setting "Not used" or "False", the output is not
reset.
Analog input / bit
Counter input. Can, for example, be the output of the
memory
"Counter" block.
Event counter / usage
For information on processing see above.
meter
5.8 Counter and summation blocks
1 = The calculated value is valid and can be used.
0 = The calculated value is invalid.
0: Block processing completed without errors
1: Block processing aborted with an error
For the meaning, see Often used parameters
(Page 252).
Program blocks
303
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