Specifications

SIMATIC Instructions
9-13
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Compare Real
Compare Real instruction is used to compare two
values: IN1 to IN2. Comparisons include: IN1 = IN2,
IN1 >= IN2, IN1 <= IN2, IN1 > IN2, IN1 < IN2, or
IN1 <> IN2.
Real comparisons are signed.
In LAD, the contact is on when the comparison is true.
In FBD, the output is on when the comparison is true.
In STL, the instructions Load, AND, or OR a 1 with the
top of stack when the comparison is true.
Inputs/Outputs Operands Data Types
Inputs ID, QD, MD,SD, SMD, VD, LD, AC, Constant, *VD, *AC, *LD REAL
Outputs (FBD) I, Q, M, SM, T, C, V, S, L, Power Flow BOOL
L
A
D
S
T
L
LDR= IN1, IN2
AR= IN1, IN2
OR= IN1, IN2
LDR>= IN1, IN2
AR>= IN1, IN2
OR>= IN1, IN2
LDR<= IN1, IN2
AR<= IN1, IN2
OR<= IN1, IN2
F
B
D
LDR<> IN1, IN2
AR<> IN1, IN2
OR<> IN1, IN2
LDR< IN1, IN2
AR< IN1, IN2
OR< IN1, IN2
LDR> IN1, IN2
AR> IN1, IN2
OR> IN1, IN2
IN1
==R
IN2
222 224
333
221
==R