Rockwell Automation 1747-PT1, D1747NP002 Hand-Held Terminal - Manual (Page 372)

Chapter 27
The Status File
27–4
Address Description 5/02
5/01,
Fixed
S:1/9 Startup Protection Fault Bit
Read/write. When this bit is set and power is cycled while the
processor is in the Run mode, the processor will execute your fault
routine prior to the execution of the first scan of your program. You
then have the option of clearing the Major Error Halted bit S:1/13 to
resume operation in the Run mode. If your fault routine does not
reset bit S:1/13, the fault mode will result.
To program this feature, set this bit using the EDT_DAT function, then
program your fault routine logic accordingly. When executing the
startup protection fault routine, S:6 (major error fault code) will contain
the value 0016H.
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S:1/10 Load Memory Module on Memory Error Bit
Read/ write. You can use this bit to transfer a memory module
program to the processor in the event that a processor memory error
is detected at power up. (A memory error means the processor
cannot run the program in the RAM memory because the program
has been corrupted, as detected by a parity or checksum error. This
type of error is caused by battery or capacitor drain, noise, a power
problem, etc.)
You must set S:1/10 in the status file of the program in the memory
module. When a memory module is installed that has bit S:1/10 set,
a processor memory error detected at power up will cause the
memory module program to be transferred to the processor, and the
Run mode to be entered.
When S:1/10 is cleared in the memory module, the processor
remains in a major fault condition if a memory error is detected on
power up, regardless of memory module presence.
When S:1/10 is also set in the status file of the user program in RAM
memory, the memory module must be installed at all times to enter
the Run or Test modes. Otherwise, the processor faults and S:6
contains error code 0013H.
To program this feature, set this bit using the EDT_DAT function.
Then store the program in the memory module.
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S:1/11 Load Memory Module Always Bit
– Not applicable to series A fixed and SLC 5/01 processors
Read/write. When this bit is set, you can overwrite a processor
program with a memory module program by cycling processor power,
with no need for a programming device. The processor mode after
powerup will be as follows:
Mode before Powerdown
Test/Program
Run
Fault after Test/Program
Fault after Run
After Powerup
Program
Run
Program
Run
Continued on next page
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