Allen-Bradley 1756 Series, User Manual, Page: 116 / 136

116 Rockwell Automation Publication 1756-UM013B-EN-P - October 2019
Appendix B Module Tag Definitions
Output Tags
Table 5 describes the 1756-IB16S module output tags.
Ptxx.ShortCircuit BOOL Indicates a short circuit. • 0 = No short circuit
• 1 = Short circuit Safety Data
Ptxx.Status BOOL Indicates the status of the channel. • 0 = Bad, causing a fault
• 1 = Good Safety Data
Safety Packed Data
Ptxx.TestOutputStatus BOOL • Safety Packed Data
Testxx.Readback BOOL Indicates that a 24V DC power source is present
at the test output. • 0 = 24V DC power is not present
• 1 = 24V DC power is present Safety Data
Testxx.Fault BOOL Indicates one of the following:
• The channel data is inaccurate and cannot
be trusted for use in the application.
For more information, see Module Data
Quality Reporting on page 40 .
• The channel is set to Not Used.
• 0 = Good data
• 1 = Bad data (faulted) or set to Not
Used
If the tag is set to 1, you must
troubleshoot the module to correct the
cause of the inaccuracy.
IMPORTANT : Once the condition that
causes the tag to change to 1 is
removed, you must complete the steps
described in
Safety Input Fault Reset on
page 50 to reset this tag to 0.
(1)
If the tag is 1 because the channel is set
to Not Used, no action is required.
Safety Data
Testxx.Uncertain BOOL Indicates that the channel data can be inaccurate
but the
degree of inaccuracy is not known .
For more information, see Module Data
Quality Reporting on page 40 .
• 0 = Good data
• 1 = Uncertain data
This tag is set to 1 when the module
has reached a critical operating
temperature or is higher the acceptable
operating temperature.
IMPORTANT : Once the condition that
causes the tag to change to 1 is
removed, the tag automatically resets
to 0.
Safety Data
Testxx.ShortCircuit BOOL Indicates an output short circuit • 0 = No short circuit
• 1 = Short circuit Safety Data
Testxx.FieldPowerOff BOOL Indicates that a field power loss condition exists
on the channel. • 0 = No field power off condition
• 1 = Field power off condition Safety Data
Testxx.Status BOOL Indicates the channel status. • 0 = Fault
• 1 = Good Safety Data
(1) If the Point Mode for the test output is Pulse Test or Power Supply when the Short Circuit condition is detected, the condition can be corrected but you cannot set the test output to a safe state.
Table 4 - 1756-IB16S Module Input Tags
Name Data Type Definition Valid Values Available With These Input
Data Type Choices
Table 5 - 1756-IB16S Module Output Tags
Name Size Definition Valid Values Available With These
Output Data Type Choice
Ptxx.ResetFault BOOL When 'Latch Fault until reset via output tag' mode is
Enabled, the I/O channel will hold safety input fault
indications until it checks that the fault is removed. If
the fault is removed, it will clear only the fault status
upon detecting that the ResetFault bit in its channel
sees a rising edge. Rising edge: the fault status is released
if the fault has been removed. Safety Data