Supplementary Explanations Of Functions - Omron SYSMAC CJ1W-AD04U Operation Manual

Supplementary Explanations of Functions

The following supplements the explanation given in 1-1 Features and Functions .
Changing Set Values during Output of Process Value Alarm
H (High Limit) Alarms
When the alarm set value is raised while the alarm output is ON, the alarm output will be turned OFF when the
following condition is satisfied.
Input value < (alarm set value after change − hysteresis)
The alarm output will first turn OFF when the input value falls below the set value (with the hysteresis included).
L (Low Limit) Alarms
When the alarm set value is lowered while the alarm output is ON, the alarm output will be turned OFF when
the following condition is satisfied.
Input value > (alarm set value after change + hysteresis)
When the hysteresis part alone of the input value is greater than the set value, the alarm output will turn OFF
for the first time.
Example: H Limit Alarms
Appendix B
Hysteresis
ON
OFF
H alarm set value
With present value at this point, alarm output turns ON.
Hysteresis
ON
OFF
H alarm set value
With present value at this point, alarm output remains ON.
ON
OFF
H alarm set value
With present value at this point, alarm output turns OFF.
Input value (Process value,
rate-of-change value,
instantaneous value)
Alarm set value further raised.
Input value (Process value,
rate-of-change value,
instantaneous value)
Alarm set value further raised.
Hysteresis
Input value (Process value,
rate-of-change value,
instantaneous value)
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