AADvance Safety Manual - Tuv-fs.com

Chapter 6 Glossary of TermsIEC 61508An international standard for functionalsafety, encompassing electrical, electronicand programmable electronic systems;hardware and software aspects.IEC 61511An international standard for functionalsafety and safety instrumented systems (SIS)for the process industry, encompassingelectrical, electronic and programmableelectronic systems, hardware and softwareaspects.indicationThe information given by an indicator.indicatorA device which can change its state to giveinformation.input (Workbench variable)In the context of an AADvance Workbenchvariable, this term describes a quantitypassed to the Workbench from a controller.instruction listAn IEC 61131 language, similar to the simpletextual language of PLCs. See 'limitedvariability language'.integerA 16-bit signed value from -32768 to 32767.One of the IEC 61131 types. See also 'word'.Kkey connectorThe receptacle on the AADvance controllerfor the program enable key. A 9-way 'D'type socket, located on the 9100 processorbase unit.Lladder diagramAn IEC 61131 language composed of contactsymbols representing logical equations andsimple actions. The main function is tocontrol outputs based on input conditions.See 'limited variability language'.LANLocal area network. A computer networkcovering a small physical area, characterisedby a limited geographic range and lack of aneed for leased telecommunication lines.limited variability languageA set of symbols and rules, designed to becomprehensible to process sector users andgiving the capability to combine pre-defined,application-specific library functions toimplement a safety requirementsspecification. Typical examples are given inIEC 61131 (part 3) and include instructionlist, ladder diagram, function block diagramand sequential function chart.live insertionThe removal and then reinsertion of anelectronic module into a system while thesystem remains powered. The assumption isthat removal of the module and reinsertionwill cause no electrical harm to the system.Also referred to as 'hot swap'.low demand modeWhere the frequency of demands foroperation made on a safety-related system isno greater than one per year and no greaterthan twice the proof-test frequency.Mmanual call pointA component of a fire detection and firealarm system which is used for the manualinitiation of an alarm.ModbusAn industry standard communicationsprotocol developed by Modicon. Used tocommunicate with external devices such asdistributed control systems or operatorinterfaces.Modbus objectA representation of the configurationsettings for a Modbus master or for itsassociated slave links, within the AADvanceWorkbench. The settings includecommunication settings and messages.Document number 553630 Issue 7: February 2010 7-5