Yokogawa DAQWORX - Manual (Page 22)

1-14 IM WX102-01E
• RL: Rate-of-change lower limit alarm
Triggers an alarm when negative change of measured value exceeds the specified
value within the specified interval.
• DH: Delta high limit alarm
This alarm is applicable only for channels for which Delta is selected. Triggers an
alarm when the difference of measured values between two channels exceeds the
specified value.
• DL: Delta low limit alarm
This alarm is applicable only for channels for which Delta is selected. Triggers an
alarm when the difference of measured values between two channels drops below the
specified value.
Measured
value
Rate-of-change
upper limit alarm
T
Time
Specified interval
1
T
2
t
1
t
2
Change of
measured value
2 1
T
Time
2
T
1
t
1
t
2
Measured
value
Rate-of-change
lower limit alarm
T –T
Change of
measured value
2 1
T –T
Specified interval
t –t
2 1
t –t
2 1
Note
• Alarm settings will be cleared in the following cases.
The measurement mode/input type (VOLT, TC, ...) is changed.
The measurement range is changed.
The span or scaling value is changed (including change of the decimal point position) during
scale conversion display mode.
Channel No., input type or input range of the standard channel is changed during delta
measurement mode.
• For pulse input channels and power monitor channels, “RH:rate-of-change upper limit alarm”
/ “RL: rate-of-change lower limit alarm” are not available.
Alarm hysteresis
A specified margin (hysteresis) can be added to the specified alarm level. (Common to all
alarms).
Alarm point (level)
Alarm OFF
Measured value
Alarm ON
1V
Hysteresis (approx. 0.5%)
Upper alarm limit (H)
1V
Lower alarm limit (L)
Measured value
Alarm OFF
Hysteresis (approx. 0.5%)
Alarm point (level)
Alarm ON
1.5 DA100 Functions