Allen-Bradley MicroLogix 1400 User Manual

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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Allen-Bradley MicroLogix 1400 Specifications

General

Processor	32-bit
Expansion Modules	Up to 7 expansion I/O modules
Power Supply	24V DC or 120/240V AC
Programming Software	RSLogix 500
Communication Ports	Ethernet, RS-232/RS-485 combo port
Controller Type	Programmable Logic Controller (PLC)
Series	MicroLogix
Digital Outputs	12
Analog Inputs	6 (embedded)
Analog Outputs	2 (embedded)
High-Speed Counter	6 high-speed counters
Pulse Output	2 (embedded)
Ethernet Port	Yes