Eaton ELC-PB, Programming Manual

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3 . I n s t r u c t i o n S e t
M N 0 5 0 0 3 0 0 3 E F o r m o r e i n f o r m a t i o n v i s i t : w w w. e a t o n . c o m
3 - 2 9 9
API Mnemonic Operands Function
118 D EBCD P S, D Floating to Scientific Conversion
Bit Devices Word devices Program Steps
Type
OP
X Y M S K H KnX KnY KnM KnS T C D E F
S *
D *
DEBCD, DEBCDP: 9
steps
ELC ELCB ELCM
PB PC/PA/PH PV PB PH/PA
32 16 P 32 16 P 32 16 P 32 16 P 32 16 P
Operands:
S : Data source D : Destination result
Description:
1. Convert the binary floating point value in the register specified by S to a decimal floating point
value and store the result in the register specified by D .
2. ELC controllers utilize the binary floating point format. The DEBCD instruction is the instruction
used to convert binary floating point to decimal floating point.
3. Flag: M1020 Zero flag, M1021 Borrow flag, M1022 Carry flag
If the absolute value of the result is larger than the maximum floating point value, the carry flag
M1022= ON.
If absolute value of the results is less than the minimum floating point value, the borrow flag
M1021= ON.
If the conversion result is 0, zero flag M1020= ON.
Program Example:
When X0= ON, the binary floating point value in D1/D0 will be converted to decimal floating point
and the result stored in D3/D2.
D0 DE BCD
X0
D2
D0 D1
D2 D3
Binary
Floating Point
23 bits for real number, 8 bits for exponent
1 bit for symbol bit
[D2] * 10
[D3]
Decimal
Floating Point
Exponent Real number
Real number Exponent