Allen-Bradley MicroLogix 1200 Reference Manual page 373

Processor Battery Low (MicroLogix 1500 only)
Address Data Format
S:5/11 binary
This bit is set (1) when the battery is low.
Install a replacement battery immediately. See your
IMPORTANT
hardware manual for more information.
See also: RTC Battery Operation on page 3-4.
Input Filter Selection Modified
Address Data Format
S:5/13 binary
This bit is set (1) whenever the discrete input filter selection in the control
program is not compatible with the hardware.
ASCII String Manipulation Error
Address Data Format
S:5/15 binary
This bit is set (1) whenever an invalid string length occurs. When S:5/15 is
set, the Invalid String Length Error (1F39H) is written to the Major Error
Fault Code word (S:6).
This bit applies to the MicroLogix 1200 and 1500 Series B Controllers.
Major Error Code
Address Data Format
S:6 word
This register displays a value which can be used to determine what
caused a fault to occur. See Identifying Controller Faults on page D-1 to
learn more about troubleshooting faults.
Range Type
0 or 1 status
Range Type
0 or 1 status
Range Type
0 or 1 status
Range Type
0 to FFFF status
System Status File C-13
User Program Access
read only
User Program Access
read/write
User Program Access
read
User Program Access
read/write
Publication 1762-RM001C-EN-P