CHAPTER 9: FLEXLOGIC AND OTHER SETPOINTS FLEXLOGIC
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 9–15
Non-volatile Latches
The purpose of a Non-volatile Latch is to provide a permanent logical flag that is stored
safely and does not reset when the relay reboots after being powered down. Typical
applications include sustaining operator commands or permanently blocking relay
functions such as Autorecloser, until a deliberate HMI action resets the latch.
Operation of the element is summarized in the following table:
Path: Settings > FlexLogic > Non-volatile Latches > Latch 1(16)
NV LATCH 1 FUNCTION
Range: Disabled, Enabled
Default: Disabled
The setpoint enables or disables the Non-volatile Latch function.
NV LATCH 1 TYPE
Range: Reset-Dominant, Set-Dominant
Default: Reset-Dominant
The setting characterizes NV LATCH 1 to be set- or reset-dominant.
NV LATCH 1 SET
Range: Any FlexLogic operand
Default: Off
If asserted, this specified FlexLogic operand ‘SET’ NV LATCH 1.
LATCH 1 RESET
Range: Any FlexLogic operand
Default: Off
If asserted, this specified FlexLogic operand ‘RESET’ NV LATCH 1.
LATCH 1 TYPE LATCH 1 SET LATCH 1 RESET LATCH 1 ON LATCH 1 OFF
Reset Dominant On Off On Off
Off Off Previous State Previous State
On On Off On
Off
Set Dominant On Off On Off
On
Off Off Previous State Previous State
Off On Off On
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