Allen-Bradley Logix5000 Reference Manual

Rockwell Automation Publication 1756-RM003N-EN-P - October 2011 277
Compute/Math Instructions (CPT, ADD, SUB, MUL, DIV, MOD, SQR, SQRT, NEG, ABS) Chapter 6
To detect a possible divide-by-zero, examine the minor fault bit (S:MINOR). See
Logix5000 Controllers Common Procedures Programming Manual, publication
1756-PM001.
Arithmetic Status Flags: Arithmetic status flags are affected.
Fault Conditions:
Execution:
Relay Ladder
Function Block
Example 1: Divide float_value_1 by float_value_2 and place the result in divide_result.
Relay Ladder
A minor fault occurs if Fault type Fault code
The divisor is zero 4 4
Condition Action
Prescan The rung-condition-out is set to false.
Rung-condition-in is false The rung-condition-out is set to false.
Rung-condition-in is true Destination = Source A / Source B
The rung-condition-out is set to true.
Postscan The rung-condition-out is set to false.
Condition Action
Prescan No action taken.
Instruction first scan No action taken.
Instruction first run No action taken.
EnableIn is cleared EnableOut is cleared.
EnableIn is set The instruction executes.
EnableOut is set.
Postscan No action taken.

Allen-Bradley Logix5000 Specifications

General

Brand	Allen-Bradley
Model	Logix5000
Category	Controller
Language	English