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Allen-Bradley MicroLogix 1100 Instruction Set Reference Manual

Allen-Bradley MicroLogix 1100
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Publication 1763-RM001C-EN-P - October 2009
System Status File 475
Math Overflow Selection
Set (1) this bit when you intend to use 32-bit addition and subtraction.
When S:2/14 is set, and the result of an ADD, SUB, MUL, or DIV
instruction cannot be represented in the destination address (underflow or
overflow),
the overflow bit S:0/1 is set,
the overflow trap bit S:5/0 is set,
and the destination address contains the unsigned truncated least
significant 16 or 32 bits of the result.
The default condition of S:2/14 is cleared (0). When S:2/14 is cleared (0),
and the result of an ADD, SUB, MUL, or DIV instruction cannot be
represented in the destination address (underflow or overflow),
the overflow bit S:0/1 is set,
the overflow trap bit S:5/0 is set,
the destination address contains +32,767 (word) or +2,147,483,647
(long word) if the result is positive; or -32,768 (word) or
-2,147,483,648 (long word) if the result is negative.
To provide protection from inadvertent alteration of your selection,
program an unconditional OTL instruction at address S:2/14 to ensure the
new math overflow operation. Program an unconditional OTU instruction
at address S:2/14 to ensure the original math overflow operation.
Watchdog Scan Time
This byte value contains the number of 10 ms intervals allowed to occur
during a program cycle. The timing accuracy is from -10 ms to +0 ms. This
means that a value of 2 results in a timeout between 10 and 20 ms.
If the program scan time value equals the watchdog value, a watchdog
major error is generated (code 0022H).
Address Data Format Range Type User Program Access
S:2/14 binary 0 or 1 control read/write
Address Data Format Range Type User Program Access
S:3H Byte 2 to 255 control read/write
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Allen-Bradley MicroLogix 1100 Specifications

General IconGeneral
Processor32-bit
Programming SoftwareRSLogix 500
MountingDIN rail or panel mount
Power Supply24V DC
TypeCompact PLC
Digital Inputs12
Digital Outputs8
Analog Inputs4 (depending on model)
Analog OutputsOptional with expansion module
Programming LanguageLadder Logic
Operating Temperature0 to 55 °C (32 to 131 °F)
SeriesMicroLogix

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