Omron SYSMAC CJ - REFERENCE MANUAL 08-2008 Reference Manual page 833

Data Control Instructions
Duty ratio
(MV/MV range)
Flags
Example
• Input time setting = 3 (Continuous adjustment)
100%
Control period (a)
100%
0%
a 0.35 s
Output
Changes in the duty ratio are monitored in real time. 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. If the duty ratio rises again after that,
the ratio will be adjusted again and the output will be turned ON. This
process is repeated continuously.
Use this setting to improve responsiveness when the control period is
relatively long and the duty ratio changes quickly. This setting is also
appropriate for lighting or power applications that require precise control.
Name Label
Error Flag ER
Example 1: Combining TPO(685) with PID(190)
When CIO 000000 is ON, TPO(685) takes the manipulated variable output
from PID(190) (contained in D00000), calculates the duty ratio from that
manipulated variable value (Duty ratio = MV
ratio to a time-proportional output, and outputs the pulses to CIO 002001.
In this case, CIO 0020 is allocated to a Transistor Output Unit and bit
CIO 002001 is connected to a solid state relay for heater control.
Control period (a)
a a
0.20 s 0.20 s
Operation
ON if the input data in S is out of range. (The input data
setting range depends on the input type setting.)
ON if the C data is out of range. (The manipulated vari-
able range will cause an error only when the input type is
set to manipulated variable.)
ON if the control period in C+1 is out of range.
ON if the output limit function is enabled but the output
lower limit (C+2) or output upper limit (C+3) is out of
range.
ON if the output limit function is enabled but the output
lower limit (C+2) is less than or equal to the output upper
limit (C+3).
OFF in all other cases.
MV range), converts the duty
Section 3-18
: Output ON
: Output OFF
a
0.20 s
Time
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