Omron SYSMAC CS Series Operation Manual page 143

Supplementary Explanation of Functions
Alarm Operation when Upper Limit is Less Than Lower Limit
Process value (instantaneous value) and rate-of-change value alarm set values can be set freely regardless of
the relative sizes of HH > H > L > LL.
Example: H < L, or HH < H.
The alarm output operation is determined purely by the relative sizes of the input value (screening value) and
alarm set value, as shown below.
HH and H Limit Alarms
When the input value is greater than the alarm set value, the alarm output is turned ON.
LL and L Limit Alarms
When the input value is less than the alarm set value, the alarm output is turned ON.
Applicable Units: CS1W-PTS01-V1 Isolated-type Thermocouple Input Unit, CS1W-PTS02/PTS03 Isolated-
type Resistance Thermometer Input Unit, CS1W-PTW01 Isolated-type 2-Wire Transmitter Input Unit, CS1W-
PDC01 Isolated-type Analog Input Unit, CS1W-PPS01 Isolated-type Pulse Input Unit, CS1W-PTR01 Power
Transducer Input Unit, CS1W-PTR02 Analog Input Unit.
Alarm Output Operation when Falling Back from Alarm
Condition Before Alarm-ON Delay Time Elapses
If inputs fall back from the alarm-ON condition (including hysteresis) before the alarm-ON delay time has
elapsed, the alarm output will not turn ON.
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Process value or rate-of-change value
Hysteresis
Low limit (L) set value
High limit (H) set value
Low limit (L) alarm output
High limit (H) alarm output
Process value or rate-of-change value
Set value
Alarm output
Alarm-ON delay time
Falling back from ON condition
Hysteresis
Time
Will not turn ON
Time
Appendix A
Time
Time
Time