Rockwell Automation 1747-PT1, D1747NP002 Hand-Held Terminal - Manual (Page 383)

Chapter 27
The Status File
27–15
Address Description 5/02
5/01,
Fixed
S:5/3 Major Error Detected while Executing User Fault Routine Bit
Read/write. When set, the major error code (S:6) will then represent
the major error that occurred while processing the fault routine due to
another major error.
If this bit is ever set upon execution of the END, TND, or REF
instruction, a major error (0020) will be declared. To avoid this type of
major error from occurring, examine the state of this bit inside your
fault routine, take appropriate action, and then clear bit S:5/3 using an
OTU instruction with S:5/3 or a CLR instruction with S:5.0.
Application example: Suppose you are executing your fault routine
for fault code 0016H Startup Protection. At rung 3 inside this fault
routine, a TON containing a negative preset is executed. When rung
4 is executed, fault code 0016H will be overwritten to indicate code
0034H, and S:5/3 will be set.
If your fault routine did not determine that S:5/3 was set, major error
0020H would be declared at the end of the first scan. To avoid this
problem, examine S:5/3, followed by S:6, prior to returning from your
fault routine. If S:5/3 is set, take appropriate action to remedy the
fault, then clear S:5/3.
•
S:5/4 M0–M1 Referenced on Disabled Slot Bit
Read/write. This bit is set whenever any instruction references an M0
or M1 module file element for a slot that is disabled (via its I/O slot
enable bit). When set, the bit indicates that an instruction could not
execute properly due to the unavailability of the addressed M0 or M1
data.
If this bit is ever set upon execution of the END, TND, or REF
instruction, a major error (0020) will be declared. To avoid this type of
major error from occurring, examine the state of this bit following a
M0–M1 referenced instruction, take appropriate action, and then clear
bit S:5/4 using an OTU instruction with S:5/4 or a CLR instruction with
S:5.0.
•
S:5/5,
S:5/6,
S:5/7 Reserved
Read/write. Reserved for minor errors that revert to major errors at
the end of the scan.
• •