KROHNE IFC 090 i Converter FOUNDATION FIELDBUS - Manual (Page 35)

Supplementary Documentation Page 35 of 44
IFC090, IFC090 i with FF
IFC090-FF Configuration
IFC090 FF 01/2006
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The input is a quantity unit per time unit (e.g. IN_1 is given as kg/h: quantity unit is kg, time unit is h). Since
the integration process operates with a time unit of seconds (s), the inputs IN_1 and IN_2 has to be adapted
to this unit. This has to be done by setting the parameters TIME_UNIT1 (for IN_1) and TIME_UNIT2 (for
IN_2) to the time unit used by the input (for the example above, TIME_UNIT1 has to be set to ‘hours‘ (h)).
Since the integration process adds the inputs IN_1 and IN_2 (if both are used), it is necessary to convert one
input into the unit of the other input. This is done by specifying a conversion factor to convert the quantity unit
of IN_2 to the quantity unit of IN_15. This conversion factor can be specified by setting the parameter
UNIT_CONV to the appropriate value.
Example:
Accumulation input
The inputs of IN_1 and IN_2 are numbers of pulses. Since the integration process operates with a quantity
unit, it has to be specified for each input how many quantities of these unit represent one pulse. This has to
be done by setting the parameters PULSE_VAL1 (for IN_1) and PULSE_VAL2 (for IN_2) to the amount of
quantity per pulse.
Since the integration process adds the inputs IN_1 and IN_2 (if both are used), it is necessary to convert one
input into the unit of the other input. As at Rate input, this is done by specifying the conversion factor
UNIT_CONV, that defines a unit conversion from IN_2 into IN_1.
5 Since both inputs already have the same time base (if TIME_UNIT1 and TIME_UNIT2 are correct configured),
it isn’t necessary to covert the time base, too.
IN_1
236 pulses * 0.1 kg/pulse
236 pulses
PULSE_VAL1 = 0.1 kg/pulse
23.6 kg
IN_2
51 pulses * 400g/pulse
51 pulses
PULSE_VAL2 = 400g/pulse
20400 g
UNIT_CONV = 10 -3
20400 g * (10 kg/g) -3
20.4 kg
IN_1
(239.5 kg/min) / (60 s/min)
239.5 kg/min
TIME_UNIT1 = min
3.991 kg/s
IN_2
(9144.0 g/h) / (3600 s/h)
9144.0 g/h
TIME_UNIT2 = h
2.54 g/s
UNIT_CONV = 10 -3
(2.54 g/s) * (10 kg/g) -3
2.54 * 10 kg/s -3