Alarm Output; Alarm History; Time Chart Of Alarm Output Function; Active Input Setting - Omron KM1 User Manual

0BChapter 3 Functions

Alarm output

Alarm output

• • Alarm output upper/lower limit threshold, alarm output hysteresis, alarm output on-delay Alarm output upper/lower limit threshold, alarm output hysteresis, alarm output on-delay
can be set. can be set.
• • Setting hysteresis can prevent frequently turning ON/OFF an alarm even when a Setting hysteresis can prevent frequently turning ON/OFF an alarm even when a
measurement value varies near the alarm output judgment value. measurement value varies near the alarm output judgment value.
• • On-delay is a function that keeps the output OFF for the specified hours and minutes. Set On-delay is a function that keeps the output OFF for the specified hours and minutes. Set
an optimum value. an optimum value.
• • Setting the upper limit threshold of each alarm to the maximum value turns the upper limit Setting the upper limit threshold of each alarm to the maximum value turns the upper limit
alarm function OFF, while setting the lower limit threshold to the minimum value turns the alarm function OFF, while setting the lower limit threshold to the minimum value turns the
lower alarm function OFF. The setting should be made to use only either upper limit alarm lower alarm function OFF. The setting should be made to use only either upper limit alarm
or lower limit alarm. or lower limit alarm.
* Do not use the alarm output function in cases related to safety, e.g., machine control, etc., * Do not use the alarm output function in cases related to safety, e.g., machine control, etc.,
because the function is assumed to detect errors and call attention by sounding a buzzer because the function is assumed to detect errors and call attention by sounding a buzzer
or lighting a lamp. or lighting a lamp.

Alarm history

Alarm history
Histories of alarms generated in the past can be confirmed via communication. Histories of alarms generated in the past can be confirmed via communication.
Histories of only 20 alarms generated in the past can be read. If the number of alarms Histories of only 20 alarms generated in the past can be read. If the number of alarms
generated exceeds 20, histories are deleted from the oldest one. generated exceeds 20, histories are deleted from the oldest one.
Alarm type, and time of alarm generation: The circuit in which an alarm was generated, and Alarm type, and time of alarm generation: The circuit in which an alarm was generated, and
Alarm release time: Alarm release time:

Time chart of alarm output function

Time chart of alarm output function
With on-delay setting, without hysteresis setting With on-delay setting, without hysteresis setting
Upper limit threshold
上限閾値
Lower limit threshold
下限閾値
Upper limit alarm judgment
上限警報判定
Lower limit alarm judgment
下限警報判定
On-delay judgment
オンディレー判 定
Upper limit alarm output
上限警報出力
Lower limit alarm output
下限警報出力
*1. Turn the alarm output OFF if the state remains OFF continuously in on-delay hour/minute and *1. Turn the alarm output OFF if the state remains OFF continuously in on-delay hour/minute and
alarm judgment. alarm judgment.

Active input setting

Active input setting
PMU1A PMU1A
(Electric (Electric
power) power) two-system) two-system)
• Sets input that performs alarm judgment.
• Since 1 bit corresponds to 1 input, bits 0 to 7 correspond to inputs 1 to 8.
• Even if input whose bit is set to 0 (OFF) is a target for alarm, it is not judged as an alarm.
• The number of CT inputs per circuit differs depending on phase wire. In that case, if one of
the CT inputs within the circuit is set to 1 (ON), it is judged as a target for alarm. For the
inputs to be used, refer to the table below and Section 2.4 "Input/output configuration and
example of wiring diagram."
• Setting range H'00000000 to H'000000FF (Initial value: H'000000FF)
PMU1A (Electric
power)
PMU2A (Power
two-system)
EMU8A
(Pulse/temperature)
CTD8E (CT
expansion)
3-12
＊1
PMU2A PMU2A EMU8A EMU8A
(Power (Power (Pulse/temperature) (Pulse/temperature)
Input 1 Input 2 Input 3
CT input 1 CT input 2 CT input 3
CT input 1 CT input 2 CT input 3
CT input 1 CT input 2 CT input 3
the time of generation are saved at first. the time of generation are saved at first.
Saved when all circuits to be judged have been Saved when all circuits to be judged have been
alarm-released. alarm-released.
＊1
CTD8E CTD8E
(CT (CT
expansion) expansion)
O: With setting
Input 4 Input 5
CT input 4
CT input 4 CT input 5
Input 6 Input 7 Input 8
Thermistor
input
CT input 6 CT input 7 CT input 8