User manual

50 Publication 1756-RM093F-EN-P - January 2010
Chapter 5 Characteristics of Safety Tags, the Safety Task, and Safety Programs
Safety Routines
Safety routines have all the attributes of standard routines, except that
they can exist only in safety programs. One safety routine may be
designated as the main routine. Another safety routine may be
designated as the fault routine. Only safety-certified instructions may
be used in safety routines.
For a listing of safety instructions, see Appendix
A.
Safety Tags
The GuardLogix control system supports the use of both standard and
safety tags in the same project. However, the programming software
operationally differentiates standard tags from safety tags.
Safety tags have all the attributes of standard tags with the addition of
mechanisms to provide SIL 3 data integrity.
ATTENTION
To preserve SIL 3, you must make sure that your safety logic
does not attempt to read or write standard tags.
Valid Data Types for Safety Tags
• AUX_VALVE_CONTROL • DIVERSE_INPUT • MUTING_FOUR_SENSOR_BIDIR
• BOOL • EIGHT_POS_MODE_SELECTOR • MUTING_TWO_SENSOR_ASYM
• CAM_PROFILE • EMERGENCY_STOP • MUTING_TWO_SENSOR_SYM
• CAMSHAFT_MONITOR • ENABLE_PENDANT • MOTION_INSTRUCTION
• CB_CONTINUOUS_MODE • EXT_ROUTINE_CONTROL • PHASE
• CB_CRANKSHAFT_POS_MONITOR • EXT_ROUTINE_PARAMETERS • PHASE_INSTRUCTION
• CB_INCH_MODE • FBD_BIT_FIELD_DISTRIBUTE • REDUNDANT_INPUT
• CB_SINGLE_STROKE_MODE • FBD_CONVERT • REDUNDANT_OUTPUT
• CONFIGURABLE_ROUT • FBD_COUNTER • SAFETY_MAT
• CONNECTION_STATUS • FBD_LOGICAL • SERIAL_PORT_CONTROL
• CONTROL • FBD_MASK_EQUAL • SFC_ACTION
• COUNTER • FBD_MASKED_MOVE • SFC_STEP
• DCI_MONITOR • FBD_TIMER • SFC_STOP
• DCI_START • FIVE_POS_MODE_SELECTOR • SINT
• DCI_STOP • INT • STRING
• DCI_STOP_TEST • LIGHT_CURTAIN • THRS_ENHANCED
• DCI_STOP_TEST_LOCK • MAIN_VALVE_CONTROL •
TIMER
• DCI_STOP_TEST_MUTE • MANUAL_VALVE_CONTROL • TWO_HAND_RUN_STATION
• DINT
IMPORTANT
Aliasing between standard and safety tags is prohibited in
safety applications.