Safety Considerations Guide, Tricon v9.0 - Tuv-fs.com

118 Indexprogramming permitted alarm 68programsEX01_shutdown 56EX02_shutdown 61EX03_shutdown 67safety-shutdown for all system-criticalI/O modules 55safety-shutdown for some system-criticalI/O modules 60protection layers 5Rredundancy statusconverting 90, 111Relay Output Modulealarms 45diagnostics 45requested scan time 53requirementsdesign 33operating 34response time and scan time 24, 68Ssafety life cycle model 12safety overview 5safety-critical modules 24safety-shutdown 24networks 24programs for all system-critical I/Omodules modules 55programs for some system-critical I/Omodules 60scan overrun 54scan surplus 53scan time 53actual 53requested 53response time and 24, 68semaphore flags 46sensorsequation for calculating PFD avg 9serial communication 32shutdownenabling for Tricon 82, 103programs for all system-critical I/Omodules 55programs for some system-critical I/Omodules 60safe 24systems emergency 21SILcalculation example 8factors 4fire and gas guidelines 28, 30general guidelines 27, 29guidelines 27–30SISfactors 5standardsapplication-specific 17general 15–16statusof critical I/O modules 75, 96surplusscan 53SYS_SHUTDOWN parametersinput 57output 63systemarchitecture 38attributes as alarms 47attributes of Main Processor 47diagnostics 39enabling shutdown for Tricon 82, 103equation for calculating PFD avg 9system-critical I/O modulessafety-shutdown program for all 55safety-shutdown program for some 60systemsburner management 21emergency shutdown 21fire and gas 22Ttechnical support viiiTricon Safety Considerations Guide