Rockwell Automation Publication 1756-RM093J-EN-P - April 2018 47
Characteristics of Safety Tags, the Safety Task, and Safety Programs Chapter 5
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.
RSLogix 5000 software prevents the direct creation of invalid tags in a safety
program. In the event that invalid tags are imported, they cannot be verified.
In safety programs on 1756-L6xS and 1768-L4xS controllers, RSLogix 5000
software also prevents the following:
• The creation of a safety tag using a structured type (user-defined, Add-On
defined, predefined) when they contain one or more members of the
REAL data type, including nested structures.
• The modification of a user-defined, or Add-On defined type that would
cause an invalid data type to be included when the user-defined or Add-
On defined type is already referenced directly or indirectly by a safety tag.
• Invalid tags created by using with the New Tag or Tag Properties dialog
box.
Table 8 - Valid Data Types for Safety Tags
• AUX_VALVE_CONTROL • DINT • MUTING_FOUR_SENSOR_BIDIR
• BOOL • DIVERSE_INPUT • MUTING_TWO_SENSOR_ASYM
• CAM_PROFILE
•
EIGHT_POS_MODE_SELECTOR
• MUTING_TWO_SENSOR_SYM
• CAMSHAFT_MONITOR • EMERGENCY_STOP • MOTION_INSTRUCTION
• CB_CONTINUOUS_MODE • ENABLE_PENDANT • PHASE
•
CB_CRANKSHAFT_POS_MONITOR
• EXT_ROUTINE_CONTROL • PHASE_INSTRUCTION
• CB_INCH_MODE • EXT_ROUTINE_PARAMETERS •
• CB_SINGLE_STROKE_MODE • FBD_BIT_FIELD_DISTRIBUTE • REDUNDANT_INPUT
• CONFIGURABLE_ROUT • FBD_CONVERT • REDUNDANT_OUTPUT
• CONNECTION_STATUS • FBD_COUNTER • SAFETY_MAT
• CONTROL • FBD_LOGICAL • SERIAL_PORT_CONTROL
• COUNTER • FBD_MASK_EQUAL • SFC_ACTION
• DCA_INPUT • 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
Aliasing between standard and safety tags is prohibited in safety
applications.
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