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

Sample Safety-Shutdown Programs 59Alarm Output OperationThe table below describes how the alarm output parameters operate.ParameterALARM_PROGRAMMING_PERMITTEDALARM_REMOTE_ACCESSALARM_RESPONSE_TIMEALARM_DISABLED_POINTSDescriptionTo remind the operator to lock out programming changesafter a download change, or for applications in whichdownload changes are not allowed, connect theALARM_PROGRAMMING_PERMITTED Output to analarmFor applications in which remote changes are not allowed,connect the ALARM_REMOTE_ACCESS Output to analarmTotal response time depends primarily on the actual scantime. To meet the required response time of the process, setthe MAX_SCAN_TIME Input to less than 50% of therequired response time. When the actual scan time exceedsthe MAX_SCAN_TIME value, theALARM_RESPONSE_TIME output becomes trueA project should not contain disabled points unless there is aspecific reason for disabling them, such as initial testing ormaintenance. To remind an operator that some points aredisabled, connect the ALARM_DISABLED_POINTS outputto an alarmChapter 4Application Development