xLadder user manual-V2.0.0.6

6.7 Floating point calculation

6.7.1 ADD - R&SUB - R

Input/output Operand

Data type

IN1, IN2

VD, ID, QD, MD, SD, SMD, LD, AC,constant, *VD, *LD, *AC

Real number

OUT

VD, ID, QD, MD, SD, SMD, LD, AC, *VD, *LD, *AC

Real number

ADD - R:Adding N1 and N2, the result is put into the

output buffer.

SUB - R:N1 minus N2, the result is put into the output

buffer.

N1, N2, and OUT are 32 bits of real numbers.

IN1 + IN2 = OUT

IN1 - IN2 = OUT

Special memory bit:

SM1.0

Zero result

SM1.1

Overflow

SM1.2

Negative result

SM1.1 is used to indicate overflow errors and illegal values.

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