Mitsubishi Electric MELSEC-Q/L - Floating Point Comparisons (Double Precision)

214
6 BASIC INSTRUCTIONS
6.1 Comparison Operation Instructions
Floating point comparisons (double precision)
EDCMP(P)
Processing details
• One of (D), (D)+1, and (D)+2 turns on depending on the results (small, match, large) after comparison data "(S1) to (S1)+3"
and comparison data "(S2) to (S2)+3" are compared.
• When the contact turns off, "(D) to (D)+2" hold the conditions immediately before the contact turns on and off.
Precautions
• The three points starting from the device specified by (D) are used. Therefore, do not overlap any device used by others.
Operation error
• In any of the following cases, an operation error occurs, the error flag (SM0) turns ON, and an error code is stored into SD0.
• QnUDVCPU, LCPU: The serial number (first five digits) is "16112" or later.
(S1): Comparison data or start number of the devices where the comparison data is stored (real number)
(S2): Comparison data or start number of the devices where the comparison data is stored (real number)
(D): Start bit device number to which the comparison result is output (Bit)
Setting
data
Internal device R, ZR J\ U\G Zn Constant
E
Others
Bit Word Bit Word
(S1)  
(S2)  
(D)  
Error
code
Error details Q00J/
Q00/
Q01
QnH QnPH QnPRH QnU LCPU
4101 The range of three points from the device specified by (D) exceeds the range
of the corresponding device.

4140 The specified device value is -0, a subnormal number, NaN (not a number),
or .

Basic
High
performance
Process Redundant Universal
Ver.
LCPU
Ver.
S2S1
EDCMPP
EDCMP
EDCMPP
EDCMP
S2S1
D
D
Command
Command
Contact
EDCMP S1 S2 D
D
D
D+2
+1
S1 S2
S1
[
[
[
[
]
]S2
S1
S1
+3
+3
]
]
+3
+3
>
=
to
to
to
to
Turns on when
Turns on when
S2
S1 S2[[]S1 +3 ]+3<to toTurns on when S2
S2