Omron SYSMAC CS Series, Reference Manual, Page: 831 / 1405

791
Data Control Instructions
Section 3-18
• 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).
Input Read Timing Setting
(C bits 08 to 11) 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 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.