Scanner instruction manual – Precision Digital PD6080 User Manual
Page 62
PD6080/PD6081 Super Snooper Modbus
Scanner Instruction Manual
62
Non-Latching Relay (A-man)
Automatic + manual reset at any time
Condition LED
Relay
Normal Off
Off
Alarm On
On
Normal Off
Off
Next Alarm
On
On
Ack
On
Off
Normal Off
Off
In this application, the scanner is set up for automatic and manual reset at any time (non-latching relay).
The LED and the relay automatically reset when the scanner returns to the normal condition.
The next time an alarm occurs, the operator acknowledges the alarm manually while the alarm condition
still exists. This causes the relay to reset, but the LED stays on until the scanner returns to the normal
condition.
Latching Relay (LatcH)
Manual reset any time
Condition LED
Relay
Normal Off
Off
Alarm On
On
Ack Off
Off
In this application, the scanner is set up for manual reset at any time. Acknowledging the alarm even if
the alarm condition is still present resets the relay and turns off the LED.
Latching Relay (Lt-Clr)
Manual reset only after alarm condition has cleared
Condition LED
Relay
Normal Off
Off
Alarm On
On
Ack (No effect)
On
On
Normal On
On
Ack Off
Off
In this application, the scanner is set up for manual reset only after the signal passes the reset point
(alarm condition has cleared). Acknowledging the alarm while it is still present has no effect on either the
LED or the relay. When the alarm is acknowledged after it returns to the normal state, the LED and the
relay go off. Notice that the LED remains on, even after the scanner returns to the normal condition. This
is because, for latching relays, the alarm LED reflects the status of the relay, regardless of the alarm
condition.