Siemens Simatic RTU3030C, Руководство по эксплуатации

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Program blocks
5.8 Counter and summation blocks
RTU303xC
304
Operating Instructions, 06/2019, C79000-G8976-C382-06
Parameters Tag type / range of
values
Description
Function parameters
Pulse weighting:
number of pulses
1 .. +4294967295 Number of pulses (n) included in the required value for
the pulse weighting (Q/n). *
Pulse weighting:
amount
3.402823 e-38 ..
3.402823 e+38
Max. 19 characters,
display of max. 4
decimal places.
Amount (Q) included in the required value for the pulse
weighting (Q/n). *
Output parameters
Flow
Analog memory bit
•
Configured as a
floating-point
number:
3.402823 e-38 ..
3.402823 e+38
• Configured as a
counter:
0 .. 4294967295
Tag in which the calculated flow value is output.
Value valid Digital output / bit
memory
Tag in which the the validity identifier of the flow value
calculated by the block is output:
•
1 = The calculated value is valid and can be used.
•
0 = The calculated value is invalid or the calculation
is not yet completed.
Error Digital output / bit
memory
Error display:
• 0: Block processing completed without errors
•
1: Block processing aborted with an error
For the meaning, see Often used parameters
(Page 252).
* Note: The values of the two parameters of the pulse weighting are limited together to 50000. A
maximum of 50 Hz are processed over 10 seconds.
5.8.5 Flow totalizer
Function
The function integrates the value at the "Volume flow" input over time.
In every update cycle, the function reads the analog signal at the "Volume flow" input and
multiplies the value with the time difference since the last update cycle. Seen mathematically
this forms the integral of the volume flow over time or the area below the curve of the volume
flow over time.