Delta Electronics Programmable Logic Controller DVP-PLC - Manual (Page 437)

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”.