Pulse Width Modulation - Mitsubishi Electric a2 Series Programming Manual

α
2 Simple Application Controllers
6.21

Pulse Width Modulation

The function block emits a continuous pulse train output when an input is given at a preset duty
cycle.
Table 6.22: Pulse Width Modulation
Function
0 0 0
I P O
P W M
Note:
The ON/OFF time cannot be less than one scan time for the controller; otherwise, the PWM
Function Block will not perform its assigned task for the time specified. Users can monitor the
scan time from the
therefore, caution is needed as and when time units are selected.
1 ) PWM operation time chart.
Input pin
Output pin
Current value
in cycle
Note:
10ms step for minimum resolution.
Set Item
I Input pin for the pulse width modulation function block
1) The PWM function operates concurrently with the input pin status
set ON.
2) The width of the pulse is dominated by the duty and value of the
period.
FB 3) Duty (setting range:0-100%)
a) Constant Value
b) Analog In
c) FB Value
4) The period is restricted to a setting range: 1 to 32767 x 100ms
(*Note)
The function block is used to control the width of the output pulse
based on a specified period of time and duty.
1) The bit output pin is set on for the length of the duty specified.
Output
2) The following items are available for other function blocks:
a) Set Period
b) Current Period
α
2 Series Controller. Scan time is dependent on the user-program;
OFF ON
OFF ON OFF
Duty: 70%
(ON Time: 70%)
Set cycle
Description
Function Blocks 6
6 - 51