Omega Vehicle Security CN3271 Series manual Alarm functions, Serial LInk optional

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Alarm functions

(Skipped if option is not available or P1 = none) The alarm can be programmed as:

-process alarm

-band alarm

-deviation alarm.

Band and deviation alarms are referred to the limiter threshold and are possible only if an high limiter or a low limiter function has been selected. For all the alarm types, it is possible to select automatic or manual reset or the “Silence” function.

The "Silence" function is a typical function of the alarm annunciators (see ISA “Alarm annunciator operational sequence”) and it is usually applied to audible alarm indications (horn). This function allows the manual reset of the alarm even if the alarm condition is still in progress.

It is also possible to assign to the alarm a stand by (mask) function.

If the alarm is programmed as band or deviation alarm, this function masks the alarm condition after a safety threshold change or at the instrument start-up until process variable reaches the alarm threshold plus or minus hysteresis. If the alarm is programmed as a process alarm, this function masks the alarm condition at instrument start-up until process variable reaches the alarm threshold plus or minus hysteresis.

Graphic example of the alarm behaviour are shown at pages 12 and 13.

Serial LInk (optional)

The device can be connected to a host computer via serial link.

The host can put the device in LOCAL (parameters are controlled via keyboard) or in REMOTE (functions and parameters are controlled via serial link).

REMOTE is shown by the decimal point to the left of "REM" which is on the right side of the numerical display.

Via serial link it is possible to read and/or to modify all the operative and configuration parameters.

The following conditions must apply to implement this function:

1)Configure parameters L1 through L4 with the front keyboard.

2)The device must be in the Operating mode.

For other details require ENG 816-E document.

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Contents CN3271-add2.pmd 19/08/2004 OMEGAnet On-LineService Internet e-mail Info@omega.com Contents Screw Bracket Panel Mounting RequirementsDimensions and Rear Terminal Blocks Without RS-485 With RS-485Panel Cutout Wiring Guidelines MA, mV and V Inputs Wiring RTD Input Linear InputOUT 1 Class Logic Input for models with RS-485 onlyRelay Outputs Use cupper conductors onlyInductive Loads Serial Interface100 to 240 Vac Power Line and groundingAA/A 500 mA 250 100/240 V AC 125 mAHigh Low Limiter with RS-485 High Low Limiter without RS-485Configuration Procedure Configuration KEY FunctionsSerial Interface Protocol Type R5 = Offset AdjustmentR7 = Alarm action on input fault Value R2 = Decimal Point PositionC2 = Rearming Mode Hi.Lo = High and low limit for special process= Alarm configuration = Rearm at Power-up Auto = Automatic rearmConstant Alarm Function = Shutdown memoryExample for P2 = H.A.A.c P3 = Alarm ActionExample for P2 = H.L = Safety Lock Alarm Standby mask FunctionT1 = Timeout Selection Operating Mode Normal Display ModeNormal Display Mode to Operative Parameter Display Mode IndicatorsFlashes when alarm is on Operative Parameter Display ModeOperating Parameters Limiter function Example 1 C1 = Hi and C2 = O Example 2 C1 = Hi and C2 =Serial LInk optional Alarm functionsDevice can be connected to a host computer via serial link Error List Error MessagesError Messages Dealing with Error MessagesCommon mode rejection ratio General SpecificationsPower consumption 8 VA Temperature Drift CJ excludedInputs Thermocouple Linear InputsOutputs AlarmLogic Inputs OutputMaintenance Serial Communication Interface OptionDefault Parameters Default Operating Parameters ListLHL-A-NEUTRO.pmd 19/04/2004 Second Seconds Appendix A.3 Appendix B Thermocouple Compensating Cable Color Codes Return Requests / Inquiries Data Acquisition
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