flow totalizer|ribosome profiling|rotameter flow meter

Flow Meters – Silver Automation Instruments

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1. Siemens Boruto calculates cumulative flow through instantaneous flow

In Siemens Boruto, instantaneous flow can be used to calculate cumulative flow through three methods: functional blocks, structured programming, or timed reading and calculation. 1. Use the function block "Totalizer" in the STEP7 V5. x environment. The function block "Totalizer" is a tool specifically designed for traffic accumulation calculation. Its core parameters include: measured value: input instantaneous flow rate value (such as cubic meters per second, liters per minute, etc.); Interval Time: Set the calculation cycle (such as 1 second, 1 minute) to match the actual physical unit; Cycle Time: The scanning cycle of the PLC must be synchronized with the calculation logic; Reset signal: When triggered, reset the cumulative value to zero. By combining the instantaneous flow value with the time parameter, the function block automatically completes the integration operation internally and outputs the cumulative flow result. This method is suitable for scenarios with moderate accuracy requirements and simple logic, but attention should be paid to the compatibility differences between STEP7 V5. x and TIA Botu. In TIA Botu, structured programming can be implemented by creating new functional blocks (such as "FB39_LowAccumulate") to achieve more flexible accumulation calculations. The specific logic is as follows: Loop interrupt organization block call: It is executed periodically in loop interrupt blocks such as OB35 (e.g. every 100ms); Trapezoidal integration formula: When the instantaneous flow rate (# FlowInOut) is within the set range, the cumulative value (# FlowAccSta) is updated according to the formula: # FlowAccSta:=# FlowAccSta+0.

5 * # ScanTime * (# FlowInOut+# LastFlow), where # ScanTime is the scanning period and # LastFlow is the flow rate value of the previous period. The formula is approximately integrated using the trapezoidal method; Reset function: When the reset signal is triggered, it directly resets # FlowAccSta. This method is suitable for scenarios that require high precision or custom logic, but it is necessary to ensure that the scanning cycle is stable and the formula parameters are consistent with the physical units. For PLCs such as S7-1200/1500, the timed reading and integration algorithm can be configured with a cyclic interrupt organization block (such as OB35) during TIA, which reads the instantaneous flow rate at fixed intervals (such as 100ms) and calculates the cumulative value through integration or differentiation algorithms. For example, the integral method considers the instantaneous flow rate within a time interval as a constant, and the cumulative value is the sum of the products of the flow rate and time in each interval; Differential method: Calculate the cumulative value based on the rate of flow change (rarely used separately). This method requires strict matching of scanning cycle and time interval parameters to avoid calculation errors caused by unstable cycles, and is suitable for scenarios with high real-time requirements. Key considerations: All methods must set parameters based on actual physical units (such as when the flow unit is cubic meters per second and the time interval is set to seconds), and ensure that the scanning period matches the calculation logic to avoid cumulative errors. The reset signal needs to be triggered by hardware or software to ensure data reliability.

flow totalizer|ribosome profiling|rotameter flow meter

1. Siemens Boruto calculates cumulative flow through instantaneous flow

2. Ribosome profili

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