JUMO 706510 LOGOSCREEN 500 cf Operating Manual - Manual (Page 21)

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2 Device description
The following variables are used for the formulae:
- analog inputs (AE1 — AE6)
- math channels (MAT1 — MAT6)
- counter/integrator channels (ZI1 — ZI6)
- binary inputs (BE1 — BE4)
- alarms
- errors
- Modbus flag (signal via interface)
- instrument-specific data (only after consultation with the manufacturer)
If counter/integrator values are used for calculation, then please note that their
accuracy is reduced, since, in this case, two different data formats have to be
used for calculation. The counters/integrators are calculated in the double-
float format, whereas the math module employs a single-float format that
follows the IEEE 754 standard. Nevertheless, it is possible to include these
values in the math module.
The following fixed functions are available:
- difference
- ratio
- relative humidity (psychrometric measurement)
- moving average
For the moving average, the reference channel has to be entered (in most
cases, the analog input number) and the time period (in minutes) for
calculating the moving average.
The following operators and functions are available for the formulae: +, -, *, /,
(, ), SQRT(), MIN(), MAX(), SIN(), COS(), TAN(), **, EXP(),
ABS(), INT(), FRC(), LOG(), LN().
On going above or falling below the scalable values, the math channel is
treated as for “out-of-range”.
The formulae are entered in the PC, in the setup program. The mathematical
formulae cannot be edited by using the keys on the instrument.
H
For further information, refer to
Chapter 5.9 “Math/logic”