CHAPTER 4: INTERFACES FRONT PANEL INTERFACEB90 LOW IMPEDANCE BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL 4-214• OTHER — This LED indicates a composite function was involved, BUS 5 OP was asserted, or BUS 6 OP was asserted. Inthe B90, composite function means either any Digital Element OP or any TRIP BUS op.• ZONE 1 — Driven by Zone 1 OP• ZONE 2 — Driven by Zone 2 OP• ZONE 3 — Driven by Zone 3 OP• ZONE 4 — Driven by Zone 4 OPThe user-programmable LEDs consist of 48 amber LED indicators in four columns. The operation of these LEDs is user-defined. Support for applying a customized label beside every LED is provided. Default labels are shipped in the labelpackage of every B90, together with custom templates. The default labels can be replaced by user-printed labels.User customization of LED operation is of maximum benefit in installations where languages other than English are usedto communicate with operators. See the User-Programmable LEDs section in chapter 5 for the settings used to programthe operation of the LEDs on these panels.4.2.7.2 Standard faceplateThe standard faceplate consists of three panels with LED indicators, keys, and a communications port. The RESET key isused to reset any latched LED indicator or target message, once the condition has been cleared (these latched conditionscan also be reset via the SETTINGS INPUT/OUTPUTS RESETTING menu). The RS232 port is for connection to acomputer.The USER keys are not used in this unit.Figure 4-23: LED panel 1Status indicators• IN SERVICE — Indicates that control power is applied, all monitored inputs/outputs and internal systems are fine, therelay has been programmed• TROUBLE — Indicates that the relay has detected an internal problem• TEST MODE — Indicates that the relay is in test mode. For more information, see the Test Mode section in the Settingschapter.• TRIP — Indicates that the selected FlexLogic operand serving as a Trip switch has operated. This indicator alwayslatches; the reset command must be initiated to allow the latch to be reset.• ALARM — Indicates that the selected FlexLogic operand serving as an Alarm switch has operated. This indicator isnever latched.• PICKUP — Indicates that an element is picked up. This indicator is never latched.
