Rievtech PR-12 Series, User Manual And Programmers Manual

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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.
In LAD and FBD
： 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.