F Value Calculation - JUMO mTRON T Operating Manual

3 Configuration
3.8.2

F value calculation

The F value is calculated from the actual value (core temperature) and the exposure time. The
calculation is based on the F value table F70 (meat processing) or F121 (preserves). The F
values of the corresponding table are added up as soon as the actual value has exceeded the
respective temperature limit (F70: ≥ 55 °C; F121: ≥ 95 °C). The F value is reset to 0 when the
temperature limit is not met.
The F value calculation is controlled by two digital signals which enable the calculation or reset
the F value to 0. The calculated F value is made available in the analog selector.
The section changeover is not part of the F value calculation, but can be implemented via the
PLC configuration.
The following settings are required for PLC configuration:
• Actual value (parameter 6): select analog signal to supply the actual value.
• F value enable (parameter 9): select digital signal to enable the F value calculation (high
active). If the digital signal has Low status, the calculation is interrupted and the current F
value is stored. Once the digital signal has High status again, the calculation resumes.
• F value reset (parameter 10): select digital signal to reset the F value (for an ascending
edge).
• F value table (parameter 14): select table for calculating the F value.
Yes = F121 (preserves); No = F70 (meat processing)
CPU > Configuration level > PLC configuration
In this example, input 3 (AI03) of the 4-channel analog input module (Analog In 4x) is used as
the actual value for the F value calculation (P1 X F value).
The enabling of the F value calculation (P1 F value enable) is controlled with input 5 (DI05) of
the 12-channel digital input/output module (Digit.I/O 12x).
For resetting the F value (P1 F value reset), input 6 (DI06) of the 12-channel digital input/output
module (Digit.I / O 12x) is used.
F121 (yes) is selected as the F value table (P1 J:F121 / N:F70).
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