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2 Instructions
2-272
CP1E CPU Unit Instructions Reference Manual(W483)
• The parameters (in C to C+3) are read in real time each time that the instruction is executed. When
changing the parameters, change all of them at the same time so that different sets of parameters are
not mixed.
• The output (R) is turned ON/OFF when the instruction is executed and the accuracy of the output’s
ON/OFF timing is 10 ms max.
• Execution of the instruction stops when the input condition goes OFF. At that time, the elapsed time
value will be reset and the control period will be initialized.
• The input type setting (bits 04 to 07 of C) determines whether the input word (S) contains a duty ratio
or manipulated variable. When S contains the manipulated variable, the duty ratio is calculated by
dividing the manipulated variable input by the manipulated variable range (bits 00 to 03 of C).
• The input read timing setting (bits 08 to 11 of C) specifies when the input word (S) is read, as shown
in the following table:
The following diagrams show the operation of each input read timing setting.
• Input time setting = 0 (Use the beginning value of the control period.)
• Input time setting = 1 (Use lower value.)
Input read timing Description
0: Use the beginning value of
the control period
The duty ratio input is read at the beginning of the control period and the ratio cannot be
changed during the control period.
1: Use lower value If the duty ratio input falls below the duty ratio at the beginning of the control period, the
lower value will take precedence and the output ON time will be reduced accordingly.
2: Use higher value If the duty ratio input rises above the duty ratio at the beginning of the control period, the
higher value will take precedence and the output ON time will be increased accordingly.
3: Continuous adjustment The duty ratio will be read in real time each time the instruction is executed and the
ON/OFF operation will be repeated within the control period.
100%
a × 0.55 s a × 0.45 s a × 0.70 s
a × 0.30 s
70%
55%
0%
Control period (a)
Read only at the beginning of the control period.
Control period (a)
Time
Output
Duty ratio
(MV/MV range)
Each control period’s output is determined by the duty ratio at the beginning of that period.
Use this setting for general applications.
100%
a × 0.35 s a × 0.65 s
a × 0.70 s
a × 0.30 s
70%
55%
35%
0%
Control period (a) Control period (a)
Time
Output
Duty ratio
(MV/MV range)
55% target
cut to 35%.
70% target
is kept.
If the duty ratio falls below the initial value early enough, the duty ratio will be adjusted and the
output will be turned OFF sooner.
Use this setting for applications such as avoiding overshooting when using time-proportional
control to control heating and using a relatively long control period.