Rockwell Automation 1761 MicroLogix 1000 Programmable Controllers - Manual (Page 162)

Preface MicroLogix 1000 Programmable Controllers User Manual
9–14
Overflow Trap Bit, S:5/0
Minor error bit (S:5/0) is set upon detection of a mathematical overflow or division
by zero. If this bit is set upon execution of an END statement, or a TND instruction,
a major error occurs.
In applications where a math overflow or divide by zero occurs, you can avoid a
controller fault by using an unlatch (OTU) instruction with address S:5/0 in your
program. The rung must be between the overflow point and the END or TND
statement.
Changes to the Math Register, S:13 and S:14
Move and logical instructions do not affect the math register.