Controls Engineering

PLC Task Memory-Scan Time Compatibility Index for Control Loop Determinism Calculator

PLC Task Memory-Scan Time Compatibility Index for Control Loop Determinism engineering calculator.

Quick Answer

Calculate PLC Task Memory-Scan Time Compatibility Index for Control Loop Determinism

Calculator

Task Memory-Scan Time Compatibility Index (dimensionless)
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Result Interpretation

PLC Task Memory-Scan Time Compatibility Index for Control Loop Determinism Calculator computes Task Memory-Scan Time Compatibility Index in dimensionless using the defined engineering formula and the input values provided.

Worked Example

Verified calculation

Given:

  • Task Memory Footprint = 48
  • Deterministic Scan Time Budget = 10000
  • Base Task Overhead = 2500
  • Memory Access Latency per kB = 12.5

Expected Result:

  • Task Memory-Scan Time Compatibility Index = 0.69

Engineering Interpretation:

Under the given input conditions, the calculated result is: Task Memory-Scan Time Compatibility Index = 0.69 dimensionless.

The actual numerical result is computed by the Runtime engine using the persisted tool definition. The values shown here come from automatically validated test cases.

Formula / Method

task memory-scan time compatibility index = (deterministic scan time budget - (base task overhead + (task memory footprint * memory access latency per kb))) / deterministic scan time budget

Formula family: formula_controls_plc_task_memory_footprint_vs_deterministic_scan_time_budget_compatibility_checker

Variables

SymbolLabelRoleDescription
scan_time_budget_us Deterministic Scan Time Budget INPUT Deterministic Scan Time Budget
base_task_overhead_us Base Task Overhead INPUT Base Task Overhead
memory_footprint_kb Task Memory Footprint INPUT Task Memory Footprint
memory_access_latency_us_per_kb Memory Access Latency per kB INPUT Memory Access Latency per kB
task_memory_scan_time_compatibility Task Memory-Scan Time Compatibility Index OUTPUT Task Memory-Scan Time Compatibility Index

Calculation Steps

  1. Enter the deterministic scan time budget in us.
  2. Enter the base task overhead in us.
  3. Enter the task memory footprint in kB.
  4. Enter the memory access latency per kb in us/kB.
  5. Step 1: Compute task memory-scan time compatibility index.
  6. Read the task memory-scan time compatibility index (dimensionless) from the results.

Engineering Summary

Calculate PLC Task Memory-Scan Time Compatibility Index for Control Loop Determinism

Frequently Asked Questions

What does this calculator calculate?

The PLC Task Memory-Scan Time Compatibility Index for Control Loop Determinism Calculator estimates Task Memory-Scan Time Compatibility Index based on the input parameters you provide

Why is deterministic scan time budget important in this calculation?

deterministic scan time budget is inversely proportional to task memory-scan time compatibility index. When you enter deterministic scan time budget in us, the calculator uses it in the engineering formula to compute the output

How should I interpret the result task memory-scan time compatibility index?

The calculator outputs task memory-scan time compatibility index in dimensionless. The result is computed directly from the input values using the defined engineering formula

What units should I use for the inputs?

Enter each value in the units shown next to the input field: Deterministic Scan Time Budget (us), Base Task Overhead (us), Task Memory Footprint (kB), Memory Access Latency per kB (us/kB). Make sure all inputs use the specified units for consistent results

What assumptions does this calculator use?

This calculator uses automatically validated engineering formulas. Results are approximate and should be validated against site-specific conditions, applicable codes, and professional engineering judgment

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