CERN LASER Alarm System Katarina Sigerud, CERN ACS workshop, 9 October 2005

CERN CERN LASER LASER Alarm SystemAlarm System

Katarina Sigerud, CERN

ACS workshop, 9 October 2005

9 October 2005 CERN LASER Alarm System, ACS workshop - Katarina Sigerud 2

ContentContent

IntroductionScopeSystem overviewStatus


IntroductionIntroduction

The LHC alarm service Delivers an alarm

service for the operation of the CERN accelerator chain and technical services


ScopeScope

Deals with abnormal situations – Fault states (FS)– Range from severe alarms to warning states

Provides – FS collection, analysis and distribution, definition

and archiving– Dedicated alarm consoles

Does not perform surveillance– Responsibility of user surveillance programs

(USP) –alarm sources– Provided by application writers and equipment

specialists


System overviewSystem overview

A distributed, layered system Layers communicate via

well-defined interfaces Resource tier

– Dispersed set of sources (USP’s) detecting FS changes

Business tier– Implements business logic

and services Client tier

– Dedicated consoles and software clients


Resource tierResource tier

Consists of a dispersed set of sources (USP’s) Communicates with business tier via the LASER

Source API– Triggers FS changes– Sends ‘Keep-alive’/Synch message

Implemented on a variety of platforms and OS


Close up on FS triggeringClose up on FS triggering

try { FaultState fs = AlarmSystemInterfaceFactory.createFaultState(ff, fm, fc); fs.setDescriptor(FaultState.ACTIVE); fs.setUserTimestamp(new Timestamp(System.currentTimeMillis())); Properties props = new Properties(); props.setProperty(FaultState.ASI_PREFIX_PROPERTY, "prefix"); props.setProperty(FaultState.ASI_SUFFIX_PROPERTY, "suffix"); props.setProperty("TEST_PROPERTY", "TEST_VALUE"); fs.setUserProperties(props);

alarm_source.push(fs);} catch (ASIException e) { ... }


Business tier servicesBusiness tier services FS collection, analysis and

distribution– FS changes are asynchronously

and sequentially collected from sources

– Different techniques are used to reduce the number of alarms distributed

– FS’s are distributed into a hierarchy of domains of interest

Source monitoring– ‘Watch-dog’ mechanism based

on source’s ‘keep-alive’ message

Alarm console client configuration

FS definition– FS definition inserts,

deletes, updates– FS relationships, used for

reduction FS archiving

– FS and FS definition changes


Business tier technologyBusiness tier technology

Relies on the Java 2 Enterprise Edition (J2EE) specifications– Java Messaging System (JMS)– Enterprise Java Beans (EJB)– Hibernate/Spring

Deployed on– Oracle Application Server Containers for

J2EE (OC4J) integrated with SonicMQ


Close up on FS definitionClose up on FS definition FS static information

– Id• Fault family (System name)• Fault member (Identifier)• Fault code (Problem

description)– Priority– Information

• Cause• Action• Consequence

– Piquet information• Help URL• Piquet GSM• Piquet email

– Definition responsible– Location

FS relationships– Source

• Unique name• Brief description• Connection timeout• Definition responsible

– Categories• Connect alarms to nodes

and/or leaves in the category tree

– Multiplicity reduction• Create the multiplicity parent

and set the threshold value• Connect children alarms to the

parent– Node reduction

• Select the node parent• Connect children alarms to the

parent

Mandatory attributes


Close up on FS reductionClose up on FS reduction Multiplicity reduction

– A <threshold> number of multiplicity children FS are activated the multiplicity parent FS is activated The active multiplicity children are reduced

– The multiplicity parent FS is a ‘dummy’ FS

Node reduction– The node parent FS is activated the

active node children FS are reduced– The node parent FS is a real FS

Multiplicity parent

Reduced multiplicity children


Client tierClient tier Dedicated alarm consoles and software clients Communicates with the business tier via

– The LASER Client API• FS changes are sent asynchronously, based on the set of categories

and filters passed to business tier– The LASER Console API

• Login and configuration facilities for the dedicated alarm consoles The dedicated alarm consoles are based on the NetBeans

platform


Close up on alarm consoleClose up on alarm console


StatusStatus

First version operational– CERN technical services– LHC power converters commissioning– More detail at First operational experience with

LASER at ICALEPCS, TH2.3-7O

Next– Continuously provide alarm service– Prepare for startup of accelerator complex in 2006– On-line FS definition updates


[email protected]

Documents

CERN LASER Alarm System Katarina Sigerud, CERN ACS workshop, 9 October 2005