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

82 TR_SHUTDOWN Function BlockTR_SHUTDOWN Function BlockEnable System ShutdownThe TR_SHUTDOWN function block provides an easy way to enable systemshutdown according to industry guidelines.Parameter Type DescriptionInputs CI BOOL Control In—enablesoperationIf CI=FALSE, thenCO=FALSE—there is nochange in the output valueIf CI=TRUE andERROR_NUM=0, thenCO=TRUEIO_CO BOOL Critical I/O Control Out—True indicates that a userdefinedfunction blockprovides the status forcritical I/O modulesIO_TMR BOOL Three channels areoperating without faults onevery critical I/O moduleIO_GE_DUAL BOOL At least two channels areoperating without faults onevery critical I/O moduleIO_GE_SINGLE BOOL At least one channel isoperating without faults onevery critical I/O moduleIO_NO_VOTER_FLTS BOOL No voter faults exist oncritical I/O modulesIO_ERROR DINT Zero means no error—nonzeromeans there is aprogramming error or aconfiguration errorTricon Safety Considerations Guide