Mitsubishi MELSEC iQ-F FX5 series, Programming Manual, Page: 408 / 888

406
7 APPLICATION INSTRUCTION
7.7 Real Number Instruction
Single-precision real number comparison
DECMP(P)
These instructions compare two data values (single-precision real number), and output the result (larger, same or smaller) to
three consecutive bit devices.
Setting data
■
Descriptions, ranges, and data types
■
Applicable devices
Processing details
• These instructions compare the comparison value (s1) with the comparison source (s2) as floating point data, and one of
the bits among (d), (d)+1, and (d)+2 turns on according to the result (smaller, same or larger).
• When the constant (K or H) is specified the device specified by (s1) and (s2), these instructions convert the binary value
into single-precision real number automatically.
Precautions
• Three devices ((d), (d)+1, and (d)+2) specified by (d) are occupied. Note that these devices are not used for any other
purpose.
Ladder diagram Structured text
ENO:=DECMP(EN,s1,s2,d);
ENO:=DECMPP(EN,s1,s2,d);
Operand Description Range Data type Data type (label)
(s1) Comparison data or the number of the device where the
comparison data is stored 0, 2
-126

|(s1)|<2
128
Single-precision real number Single-precision real number
(s2) Comparison data or the number of the device where the
comparison data is stored 0, 2
-126 
|(s2)|<2
128
Single-precision real number Single-precision real number
(d) Start bit device number to which comparison result is output
(Three devices are occupied).

Bit Bit
Operand Bit Word Double word Indirect
specification Constant Others
X, Y, M, L,
SM, F, B, SB U

\G

T, ST,
C, LC T, ST, C, D,
W, SD, SW, R U

\G

Z LC LZ K, H E $
(s1)
            
(s2)
            
(d)
            
(s1) (s2) (d)
DECMP (s1) (s2) (d)
(d)
X0
(d+1)
(d+2)
Turns on in the case of [(s1)+1, (s1)] > [(s2)+1, (s2)]
Turns on in the case of [(s1)+1, (s1)] = [(s2)+1, (s2)]
Turns on in the case of [(s1)+1, (s1)] < [(s2)+1, (s2)]
Even if the command input X0 turns off before the DECMP instruction is fully executed, (d) to (d)+2 hold the status.