Chapter 7 Second Development Platform VP3000
338
API Instruction code Operand Function
110 D ECMP P S
1
, S
2
, D
Binary floating-point number
comparison
Type
Operand
Bit devices Word devices
16-bit instruction
- - - -
32-bit instruction (13 steps)
DECMP
Continuous
execution
type
DECMPP
Pulse
execution
type
Associated flag: none
X Y M K H KnX KnY KnM T C D
S
1
S
2
D
Caution for using operand
Operand D occupies 3 consecutive devices.
See the specification of each model for the scope of device’s usage.
Description
S
1
: binary floating-point number comparison value 1
S
2
: binary floating-point number comparison value 2
D: comparison result, occupies 3 consecutive devices
The binary floating-point value 1 and 2 are compared with each other. The comparison result
(>, =, <) is stored in D.
If S
1
or S
2
is a designated constant K or H, the instruction will convert the constant into a binary
floating-point value before the comparison.
Example
Designate the device to be M10, and this automatically occupies M10 to M12.
When X0 = ON, DECMP instruction is executed, and one of M10, M11, and M12 will be ON.
When X0 = OFF, DECMP instruction is not executed, and M10, M11, and M12 remain their
status before X0 = OFF.
If you need to obtain a comparison result with ,, and ≠, make a serial-parallel connection
between M10 –M12.
To clear the comparison result, use RST or ZRST instruction.
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