GE VersaMax IC200PWR001 User Manual page 456

13
IC200MDD841
Mixed Module, 24 V DC Positive Logic Input 20 Points / Output 12 Point /
(4) High-speed Counter, PWM, or Pulse Train Configurable Points
PWM Outputs
PWM outputs can be used to control DC and stepper motors. The parameters
of PWM output operation are set up using the module's output data. (Refer to
Module Data.) The frequency of each PWM output can be set in the range of 22
Hz to 2 kHz. The % Duty Cycle of each PWM output can be set from 1 to 100
depending on the frequency of the PWM output. The graph below plots the
relationship between the minimum % Duty Cycle of a PWM output versus the
frequency of that PWM output. Note that this relationship is based on a default
Optical Isolator Correction factor value of 75μS. (See "Optical Isolator
Correction Factor" on the next page). For some frequencies, this Optical
Isolator Correction factor may be changed to further decrease the minimum
duty cycle of that particular frequency.
Minimum % Duty Cycle versus Frequency for a PWM Output
A PWM output is enabled by setting its output enable bit (in the module output
data) to ON. The output is disabled by setting its Output Enable bit to OFF.
Both frequency and duty cycle can be changed while the output is enabled.
13-16 VersaMax Modules, Power Supplies and Carriers User's Manual
Minimum
Duty Cycle (%)
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
3
1
0
PWM Frequency (Hz)
GFK-1504N