Total Solution for Industrial Automation
15
PWM Output Module User’s manual
4.2
Controlling frequency (Buffer Memory Offset 1 ~ 3)
The PWM can control the range of frequency from 0pps to 4000pps, and 4 channels
per group for a total of 3 groups. The frequencies of each group are set by TO
instruction at OFFSET 1~3 area of buffer memory.
Frequency A
(or a general output)
Frequency B
(or a general output)
Frequency C
(or a general output)
CH1
Y02
CH5
Y0A
CH9
Y12
CH2
Y03
CH6
Y0B
CH10
Y13
CH3
Y06
CH7
Y0C
CH11
Y14
CH4
Y07
CH8
Y0D
CH12
Y15
[Table 6] Terminal No. of the frequency group
The four PWM outputs within the same group are operated with a single frequency.
Since three groups can be controlled, three different frequency outputs will be
feasible.
When using TO instruction on the buffer memory, the output terminal outputs the
designated frequency instantly. To prevent drastic change of frequency, please refer
to the ramp control at 4.4.
If the frequency value goes above 4000pps, both valid range of the duty cycle and
the degree of precision will be decreased. Please be advised that this product
guarantees stated performance up to 4000pps.
Frequency(pps)
Minimum value of duty cycle(%)
Maximum value of duty cycle(%)
5000
1.0
98.0
10000
1.5
95.0
15000
3.0
94.0
20000
4.0
93.0
25000
5.0
91.0
30000
6.0
89.0
35000
7.0
87.0
40000
9.0
85.0
45000
10.0
83.0
50000
12.0
82.0
55000
13.0
80.0
60000
14.0
78.0
65000
15.0
75.0
[Table 7] Valid setting range of duty cycle per frequency area