Parameters
04/10 MN04020001Z-EN
76
Scaled value range (AI1, AI2)
The following graphs show examples of the curve characteristics
of the scaled and non-scaled input signals.
Example A
P2.2 (P2.6) = 30 %, P2.3 (P2.7) = 80 %
The incoming, analog input signal 0 – +10 V (4 – 20 mA) is used
here in the selected range from 30 to 80 %. This limited signal
range is predefined as 0 to 100 % input signal (AI
scal
):
– as frequency setpoint value from 0 – f
max
(P6.4),
– as a process variable from 0 - 100 % actual value for the PID
controller.
Example B
P2 (P2.6) = -30 %, P2.3 (P2.7) = 100 %
The incoming analog input signal 0 – +10 V (4 – 20 mA) is not
evaluated in the selected range from 0 to 30 %. In relation to the
30 %-signal, a constant offset signal of (here) 23 % is predefined
in this case. The scaled input signal (AI
scal
) is therefore
23 to 100 %:
– as frequency setpoint value: 23 % f
max
– f
max
(P6.4),
– as a process variable: 23 - 100 % actual value for the PID
controller.
P2.5 390 / AI2 Signal range (analog input). 1
Depending on the switch position of microswitch S3 (FS = PID
controller, actual value).
0 S3 = V: 0 - +10 V, voltage signal
S3 = mA: 0 - 20 mA, current signal
1 With live-zero,
S3 = V: 2 - +10 V, voltage signal,
S3 = mA: 4 - 20 mA, current signal (FS, a P9.6).
a At P8.1 it is possible to set the response of the MMX to a
setpoint error (live zero).
P2.6 391 / AI2 Custom Min 0.00
Like P2.2
P2.7 392 / AI2 Custom Max 100.00
Like P2.3
P2.8 389 / AI2 Filter time 0.1
Like P2.4
PNU ID Access right
RUN
Value Description Factory setting
(P1.3)
Figure 69: Example of scaled analog input signals
0
0
30 100 [%]
100 %
AL
scal.
80
P2.3
P2.7
P2.2
P2.6
Figure 70: Example of scaled analog input signals with offset
0-30 100
100 %
23 %
P2.3
P2.7
P2.2
P2.6
[%]
AI
scal.
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