Loss Of Communications - GE 845 Instruction Manual

MONITORING

Loss of Communications

4–296
Introduction
This section covers the functionality of the 8 Series Loss of Communications element.
The 8 Series device monitors activity on an interface via the configured protocol for this
interface. The communications status is set for each protocol.
If communications is lost, the enabled interface will issue a "Loss of Comms" event and
operate a combination of output relays / states.
Path:
Setpoints > Monitoring > Loss of Comms
FUNCTION
Range: Disabled, Trip, Alarm, Latched Alarm, Configurable
Default: Disabled
INTERFACE
Range: Serial, Serial + Ethernet, Ethernet, All
Default: Serial
Only the protocols associated with the selected interface are shown in this screen as
options. For example, if "Ethernet" is selected, the user will select the Ethernet protocols
to monitor. The Ethernet protocols selection is defined as EthernetProtocolBitmask
bitmasks.
MODBUS
Range: Off, On
Default: Off
PICKUP DELAY
Range: 0 to 600 s in steps of 1
Default: 2 s
OUTPUT RELAY X
For details see Common
BLOCK
Range: Off, Any FlexLogic operand
Default: Off
EVENTS
Range: Disabled, Enabled
Default: Enabled
TARGETS
Range: Disabled, Self-reset, Latched
Default: Latched
Figure 4-121: Loss of Communications logic diagram
Setpoints.
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS