Rockwell Automation 1761-HHP-B30 MicroLogix 1000 with Hand-Held Programmer (HHP) - Manual (Page 399)

Appendix B
Programming Reference
B–4
Address Bit Classification Description
S1/9
➀
Startup Protection
Fault Static Configuration When this bit is set and power is cycled when the controller
powers up in Run mode, the controller executes the user-fault
routine prior to the execution of the first scan of your program.
You have the option of clearing the Major Error Halted bit S:1/13
to resume operation in the REM Run mode. If the user-fault
routine does not reset bit S:1/13, the fault mode results.
Program the user-fault routine logic accordingly. When
executing the startup protection fault routine, S:6 (major error
fault code) contains the value 0016H.
S1/10 to S1/11 Reserved NA NA
S1/12
➀
Run Always Static Configuration When set, this bit causes the controller to clear S:1/13 before
attempting to enter RUN mode when power is applied or if an
unexpected reset occurs. If this bit is not set, the controller
powers up in the previous mode it was in before losing power,
unless the controller was in REM test mode. If the controller was
in REM test mode when power was removed, the controller
enters REM program mode when power is applied.
This bit overrides any faults existing at power down.
ATTENTION: Setting the Run Always bit causes
the controller to enter the REM RUN mode if an
unexpected reset occurs, regardless of the mode
that the controller was in before the reset occurred.
Unexpected resets may occur due to
electromagnetic noise, improper grounding, or an
internal controller hardware failure. Make sure your
application is designed to safely handle this
situation.
!
S1/13 Major Error Halted Dynamic
Configuration This bit is set by the controller any time a major error is
encountered. The controller enters a fault condition. Word S:6,
the Fault Code contains a code that can be used to diagnose the
fault condition. Any time bit S:1/13 is set, the controller:
•
either places all outputs in a safe state (outputs are off) and
energizes the fault LED (blinking),
•
or enters the user-fault routine with outputs active (if in REM
Run mode), allowing the fault routine ladder logic to attempt
recovery from the fault condition. If the user-fault routine
determines that recovery is required, clear S:1/13 using
ladder logic prior to exiting the fault routine. If the fault
routine ladder logic does not understand the fault code, or if
the routine determines that it is not desirable to continue
operation, the controller exits the fault routine with bit S:1/13
set. The outputs are placed in a safe state and the FAULT
LED is blinking.
➀
Address is not shown in HHP data monitor.
Continued on next page
Reference