ABB RELION Series Technical Manual page 58

Section 3
Basic functions
52
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Figure 17: Symbols used in the sequence diagrams
"Follow-S": Follow Signal, ON
In this mode ALARM follows the input signal value, Non-latched.
Activating
signal
LED
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Figure 18: Operating sequence "Follow-S"
"Follow-F": Follow Signal, Flashing
Similar to "Follow-S", but instead the LED is flashing when the input is active, Non-
latched.
"Latched-S": Latched, ON
This mode is a latched function. At the activation of the input signal, the alarm shows
a steady light. After acknowledgement by the local operator pressing any key on the
keypad, the alarm disappears.
Activating
signal
LED
Acknow.
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Figure 19: Operating sequence "Latched-S"
"LatchedAck-F-S": Latched, Flashing-ON
This mode is a latched function. At the activation of the input signal, the alarm starts
flashing. After acknowledgement, the alarm disappears if the signal is not present and
gives a steady light if the signal is present.
1MRS758755 A
REC615 and RER615
Technical Manual