Delta DVP-PLC, Applications Manual

Page: 437 / 586

8 Application Instructions API 100-149
DVP-PLC Application Manual
8-35
API Mnemonic Operands Function
124 D EXP P Exponent of Binary Floating Point
Controllers
ES/EX/SS SA/SX/SC EH/SV
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 *
DEXP, DEXPP: 9 steps
PULSE 16-bit 32-bit
ES EX SS SA SX SC EH SV ES EX SS SA SX SC EH SV ES EX SS SA SX SC EH SV
Operands:
S
: Device for operation source
D
: Device for operation result
Explanations:
1. See the specifications of each model for their range of use.
2. Flags: M1020 (zero flag); M1021 (borrow flag); M1022 (carry flag)
3. e = 2.71828 as the base and
S
as exponent for EXP operation: EXP ［
D
+1,
D
］ =
［
S
+1,
S
］
4. Both positive and negative values are valid for
S
. When designating
D
registers, the data should be 32-bit and
the operation should be performed in floating point system. Therefore,
S
should be converted into a floating
point value.
5. The content in
D
= e
S
; e = 2.71828,
S
= designated source data
6. If the absolute value of the result
＞
maximum floating point available, the carry flag M1022 = On.
7. If the absolute value of the result
＜
minimum floating point available, the borrow flag M1021 = On.
8. If the result = 0, the zero flag M1020 = On.
Program Example:
1. When M0 = On, convert (D1, D0) into binary floating point and store it in register (D11, D10).
2. When M1= On, use (D11, D10) as the exponent for EXP operation and store the binary floating point result in
register (D21, D20).
3. When M2 = On, convert the binary floating point (D21, D20) into decimal floating point (D30 × 10
[D31]
) and store
it in register (D31, D30).
M0
RST M1081
M1
DEXP D10 D20
M2
DEBCD D20 D30
DFLT D0 D10
Remarks:
For floating point operations, see “5.3 Handling of Numeric Values”.