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Allen-Bradley MicroLogix 1400 - Page 556

Allen-Bradley MicroLogix 1400
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Publication 1766-RM001A-EN-P - October 2008
554 System Status File
Sign Flag
This bit is set (1) when the result of a mathematical operation or data
handling instruction is negative. Otherwise the bit remains cleared (0).
When a STI, High-Speed Counter, Event Interrupt, or User Fault Routine
interrupts normal execution of your program, the original value of S:0/3 is
restored when execution resumes.
Controller Mode
User Application Mode
Bits 0 through 4 function as follows:
Address Data Format Range Type User Program Access
S:0/3 binary 0 or 1 status read/write
Address Data Format Range Type User Program Access
S:1/0 to S:1/4 binary 0…1 1110 status read only
S:1/0 to S:1/4 Mode
ID
Controller Mode
Use by MicroLogix Controller
(1)
S:1/4 S:1/3 S:1/2 S:1/1 S:1/0 1400
000000 remote download in progress
000011 remote program mode
000113 remote suspend mode
(operation halted by execution of the SUS
instruction)
001106 remote run mode
001117 remote test continuous mode
010008 remote test single scan mode
1000016download in progress
1000117program mode
1101127suspend mode
(operation halted by execution of the SUS
instruction)
1111030run mode
(1) Valid modes are indicated by the () symbol. N/A indicates an invalid mode for that controller.
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