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47DT OPERATING MANUAL EM-9508-B Rev.7
Figure 8: One-shot output
Without event trigger input or with event trigger mode set
to “normal”
With event trigger mode set to other than “normal”
e.g. Sampling hold
H alarm setpoint
Display value
‘H’ indicator
H alarm output (hi)
(1)
(2)
5 sec.
5 sec.
H alarm setpoint
Display value
TIMING signal
‘H’ indicator
‘P’ indicator
H alarm output (hi)
5 sec. 5 sec.
(1) When the display value exceeds the setpoint, alarm
output is provided for the set time period. ‘H’ indica-
tor turns on until the display value falls below the
setpoint.
(2) Even when the display value exceeds but falls below
the setpoint within the set one-shot output time pe-
riod, alarm output is provided for the set time period.
‘H’ indicator also turns on for this time period.
When the TIMING signal is ON and the display value
exceeds the setpoint, alarm output is provided for the
set time period. The one-shot output is provided again
with the TIMING signal ON as long as the display value
exceeds the setpoint. ‘H’ indicator turns on when the
TIMING signal is ON and the display value exceeds
the setpoint until the next TIMING signal is ON and the
alarm is canceled.
Figure 9: Coil at alarm
I/O option code ‘1’, ‘3’, ‘7’ or ‘9’ (N.O. relay or photo MOS-
FET relay, 4 points)
I/O option code ‘2’ or ‘8’ (SPDT relay, 2 points)
Display value
Alarm setpoint
Alarm output
(coil energized)
Alarm output
(coil de-energized)
Alarm setpoint
Display value
Alarm output
(coil energized)
(N.O.)
(N.C.)
Alarm output
(coil de-energized)
(N.O.)
(N.C.)
Power
In order to stop operation of equipment when the display
value exceeds the setpoint, for instance, set reversal
output logic (N.C.), “coil de-energized”.
In order to provide an alarm output at power OFF and at
alarm, set “coil de-energized” and use the N.C. terminal.
NOTE
• All parameters can be set regardless of alarm output options. The alarm indicators turn on according to the operation
even without alarm output. The settings of the one-shot output and coil at alarm do not affect the alarm indicators in
this case.
• When ‘S.ERR’ and ‘B.ERR’ is indicated, the alarm output depends on the alarm trip at over-range setting. Refer to 12.5
ALARM TRIP ACTION AT OVER-RANGE for details.
• All alarm setpoints are disabled (reset to ‘-----’ status) when the input type has been changed.
