Data type, Scope, Data type scope – Rockwell Automation 1756-L7x GuardLogix 5570 Controllers User Manual
Page 84

84
Rockwell Automation Publication 1756-UM022A-EN-P - November 2012
Chapter 6
Develop Safety Applications
Data Type
The data type defines the type of data that the tag stores, such as bit or integer.
Data types can be combined to form structures. A structure provides a unique
data type that matches a specific need. Within a structure, each individual data
type is called a member. Like tags, members have a name and data type. You can
create your own structures, as user-defined data types.
Logix controllers contain predefined data types for use with specific instructions.
Only these data types are permitted for safety tags.
Scope
A tag’s scope determines where you can access the tag data. When you create a
tag, you define it as a controller tag (global data) or a program tag for a specific
safety or standard program (local data). Safety tags can be controller-scoped or
safety program-scoped.
Table 25 - Valid Data Types for Safety Tags
AUX_VALVE_CONTROL
DCI_STOP_TEST_MUTE
MANUAL_VALVE_CONTROL
BOOL
DINT
MUTING_FOUR_SENSOR_BIDIR
CAM_PROFILE
DIVERSE_INPUT
MUTING_TWO_SENSOR_ASYM
CAMSHAFT_MONITOR
EIGHT_POS_MODE_SELECTOR
MUTING_TWO_SENSOR_SYM
CB_CONTINUOUS_MODE
EMERGENCY_STOP
MOTION_INSTRUCTION
CB_CRANKSHAFT_POS_MONITOR
ENABLE_PENDANT
PHASE
CB_INCH_MODE
EXT_ROUTINE_CONTROL
PHASE_INSTRUCTION
CB_SINGLE_STROKE_MODE
EXT_ROUTINE_PARAMETERS
REDUNDANT_INPUT
CONFIGURABLE_ROUT
FBD_BIT_FIELD_DISTRIBUTE
REDUNDANT_OUTPUT
CONNECTION_STATUS
FBD_CONVERT
SAFETY_MAT
CONTROL
FBD_COUNTER
SERIAL_PORT_CONTROL
COUNTER
FBD_LOGICAL
SFC_ACTION
DCA_INPUT
FBD_MASK_EQUAL
SFC_STEP
DCAF_INPUT
FBD_MASKED_MOVE
SFC_STOP
DCI_MONITOR
FBD_TIMER
SINT
DCI_START
FIVE_POS_MODE_SELECTOR
STRING
DCI_STOP
INT
THRS_ENHANCED
DCI_STOP_TEST
LIGHT_CURTAIN
TIMER
DCI_STOP_TEST_LOCK
MAIN_VALVE_CONTROL
TWO_HAND_RUN_STATION