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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.
Ladder diagram
(s1)
Setting data
■Descriptions, ranges, and data types
Operand
Description
(s1)
Comparison data or the number of the device where the
comparison data is stored
(s2)
Comparison data or the number of the device where the
comparison data is stored
(d)
Start bit device number to which comparison result is output
(Three devices are occupied).
■Applicable devices
Operand
Bit
X, Y, M, L,
SM, F, B, SB
(s1)
(s2)
(d)
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).
X0
DECMP
(d)
Turns on in the case of [(s1)+1, (s1)] > [(s2)+1, (s2)]
(d+1)
Turns on in the case of [(s1)+1, (s1)] = [(s2)+1, (s2)]
(d+2)
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.
• 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.
7 APPLICATION INSTRUCTION
406
7.7 Real Number Instruction
(s2)
(d)
Word
U\G T, ST,
T, ST, C, D,
C, LC
W, SD, SW, R
(s1)
(s2)
(d)
Structured text
ENO:=DECMP(EN,s1,s2,d);
ENO:=DECMPP(EN,s1,s2,d);
Range
Data type
-126
128
|(s1)|<2
0, 2
Single-precision real number
-126
|(s2)|<2
128
0, 2
Single-precision real number
Bit
Double word Indirect
U\G
Z
LC
LZ
Data type (label)
Single-precision real number
Single-precision real number
Bit
Constant
specification
K, H
E
$
Others
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