Delta DVP-ES2 User Manual download pdf (Page 138)

100

101

DVP-ES2/SA2/SS2/SA2/SX2/SE Operation Manual - Programming

3-22

 The decimal floating point is represented by 2 continuous registers. The register of smaller

number is for the constant while the register of bigger number is for the exponent.

Example:

Store a decimal floating point in registers (D1, D0)

Decimal floating point = [constant D0] × 10

[exponent D1 ]

Constant D0 = ±1,000 ~ ±9,999

Exponent D1 = -41 ~ +35

The constant 100 does not exist in D0 because 100 is represented as 1,000 × 10

-1

. The range of

decimal floating point is ±1175 × 10

-41

~ ±3402×10

+35

 The decimal floating point can be used in the following instructions:

D EBCD: Convert binary floating point to decimal floating point

D EBIN: Convert decimal floating point to binary floating point

 Zero flag (M1020), borrow flag (M1021), carry flag (M1022) and the floating point operation

instruction

Zero flag: M1020 = On if the operational result is “0”.

Borrow flag: M1021 = On if the operational result exceeds the minimum unit.

Carry flag: M1022 = On if the absolute value of the operational result exceeds the range of use.

Index register E, F

The index registers are 16-bit registers. There are 16 devices including E0 ~ E7 and F0 ~ F7.

16-bit

32-bit

High byte Low byte

 E and F index registers are 16-bit data registers

which can be read and written.

 If you need a 32-bit register, you have to designate

E. In this case, F will be covered up by E and

cannot be used; otherwise, the contents in E may

become incorrect. (We recommend you use MOVP

instruction to reset the contents in D to 0 when the

PLC is switched on.)

 Combination of E and F when you designate a

32-bit index register: (E0, F0), (E1, F1), (E2, F2), …

(E7, F7)

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Delta DVP-ES2 User Manual Page 138

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