The PWM output (0 to 100 %) is configured as a curve, in the same way as the other analogue outputs.
More information
See Hardware characteristics and configuration, General characteristics, Analogue output characteristics and
configuration.
Duty cycles
The PWM uses duty cycles for its output. The PWM frequency determines the cycle length. One cycle is therefore 1/500 Hz = 0.002
seconds long, ±10 %. The following table illustrates the output for various duty cycles.
Table 13.38
Relationship between duty cycles and the PWM output
Duty cycle Graph
100 %
Cycle
0
Voltage
[V]
time [s]
6.85
0.5
0.002 0.004
5.5
50 %
0
Voltage
[V]
time [s]
0.5
0.002 0.004
5.5
Cycle
6.85
12.5 %
0
5.5
Voltage
[V]
time [s]
0.5
0.002 0.004
0.006
Cycle
6.85
13.10.5 Analogue input (AI) characteristics
This analogue input can be configured as either current (0 to 24 mA) or voltage (-10 to 10 V). Using a configured or selected input
curve, the controller converts the input to a corresponding value. You can also configure the input to activate functions and/or
alarms.
More information
See Hardware characteristics and configuration, General characteristics, Analogue input characteristics and
configuration.
Galvanic connection
The two analogue inputs on GAM3.1 are galvanically connected. You therefore cannot use the analogue inputs on GAM3.1 in series
with each other (for example, for a back-up measurement).
DESIGNER'S HANDBOOK 4189340911K UK Page 455 of 521
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