DVP-ES2-EX2-SS2-SA2-SX2-Operation Manual

3. Instruction Set
API Mnemonic Operands Function
124 D EXP P Float exponent operation
Controllers
ES2/EX2 SS2 SA2 SX2
SE
Type
Bit Devices Word devices Program Steps
OP X Y M S K H KnX KnY KnM KnS T C D E F
S * * *
D *
Operands:
S: Exponent D: Operation result
DEXP, DEXPP: 9 steps
PULSE 16-bit 32-bit
ES2/EX2 SS2 SA2
SA2
SA2
SX2 ES2/EX2 SS2 SX2 ES2/EX2 SS2
SE SE SE SX2
Explanations:
1. The base is e = 2.71828 and exponent is S
2. EXP [ S +1, S ] = [ D +1, D ]
3. Both positive and negative values are valid for S. Register D has to be 32-bit format. Operation
is conducted in floating point value, so the value in S needs to be converted into floating value
before exponent operation.
4. The content in D: e S , e =2.71828 and S is the specified exponent..
5. Flags: M1020 (Zero flag), M1021 (Borrow flag) and M1022 (Carry flag).
If absolute value of the result is larger than max. floating value, carry flag M1022 = ON.
If absolute value of the result is smaller than min. floating value, borrow flag M1021 = ON.
If the conversion result is 0, zero flag M1020 = ON.
Program Example:
1. When M0 = ON, convert (D1, D0) to binary floating value and save the result in (D11, D10).
2. When M1= ON, perform exponent operation with (D11, D10) as the exponent. The value is
saved in register (D21, D20) in binary floating format.
3. When M2 = ON, convert the value in (D21, D20) into decimal floating point value and save the
result in (D31, D30). (At this time, D31 indicates powers of 10 for D30)
M0
RST M1081
M1
M2
DFLT D0 D10
DEXP D10 D20
DEBCD D20 D30
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