Control Output Method; Minimum Output On/Off Width V1.2 - Omron EJ1 User Manual

Setting Output Specifications
4-2-2

Control Output Method

Note
4-2-3 Minimum output ON/OFF width
58
The time-proportional output method is used for the control output.
The MV determines the percentage of time that the output is ON during each
control period.
100% 80% 60%
ON
OFF
Control
period
Note Control responsiveness improves as the control period is short-
ened, but if relays are being used for heater control, the relay life-
time will also be shortened so we recommend using a control
period of at least 20 seconds.
Variable type
E1/A1 Control Period 1 to 4
Conditions for use Control output must be assigned and set to 2-PID control.
These parameters are not valid for outputs 1 and 2 on Con-
trollers with linear outputs.
This parameter can be set only when operation is stopped. If the parameter is
set to 0, the period will be 0.5 s.
Set the minimum output ON/OFF width.
When using output relays, this function can be used to prevent the relay from
deteriorating. The relationship between MV and actual output is shown in the
following diagram.
100
Minimum output
ON/OFF width
0
MV %
Example:
When the control period is 10 s, the minimum output ON/OFF width is 10.0%,
and the MV is less than 10.0%, the output will be 0%. When the MV is 90.0%
or greater, the output will be 100%.
40% 20%
Parameter name
(I/O) 0 to 99 s
V1.2
Minimum output
ON/OFF width
100
Section 4-2
Setting range Default
2