Yokogawa DAQWORX - Manual (Page 14)

1-8 IM WX13-01E
1.1 Overview of Functions
Example: When the start condition is to scan for 1 alarm and the stop
condition is to scan for 2 alarms (OR condition)
Logging begins from the point the alarm occurs. At that point (B) the stop conditions
are met (alarm 1 or 2 is occurring) but logging does not stop. The stop condition’s
alarm 1 is cleared and reactivated between points B and C’, but logging does not
stop because stop condition’s alarm 2 is still occurring during that time, and the stop
condition continues to be met. Both stop condition alarms are finally cleared for the
first time at point C, making the stop conditions no longer met. Only after that, at point
D, are stop conditions met again and logging stops. (See the following figure for the
letters referred to in the text above.)
Start
Condition
Time
Stop
Condition
Alarm 1
Alarm 1
Alarm 2
Logging period
Logging stops
Period during which alarms
are occurring
Logging start
A
B C
C’
D
• Operation if the start conditions were already met at the point stop
conditions are met
Logging stops at the point at which stop conditions were met (A), and start condition
scanning begins at the same time. At that point (B), start conditions are met but
logging is not stopped. Logging starts at point (D) in which start conditions were met
again after point (C) prior to which start conditions failed to be met the first time. (See
the following figure for the letters referred to in the text above.)
Start
Condition
Time
Stop
Condition
Logging period Logging period
Logging starts
Logging stops
B
A
C D
Period during which
conditions are met
Period during which
conditions are met
Period during which
conditions are met