Delta DVP-ES2/EX2/SS2/SA2/SX2/SE manual Subr

3. Instruction

Set

API

Mnemonic

Operands

Function

Controllers

173

D

SUBR

P

Floating point

ES2/EX2 SS2 SA2 SX2

subtraction

SE

Type

Bit Devices

Word devices

Program Steps

OP

X

Y

M

S

K H KnX KnY KnM KnS T C

D

E

F DSUBR: 13 steps

S1

*

S2

*

D

*

PULSE

16-bit

32-bit

ES2/EX2

SS2

SA2

SX2

ES2/EX2

SS2

SA2

SX2

ES2/EX2

SS2

SA2

SX2

SE

SE

SE

Operands:

S1: Floating point minuend S2: Floating point subtrahend

D: Remainder

Explanations:

1.SUBR instruction subtracts S1 with S2 and stores the operation result in D.

2.In SUBR instruction, floating point values can be directly entered into S1 and S2..

3.In DSUBR instruction, floating point values (e.g. F1.2) can be either entered directly into S1 and S2 or stored in data registers for operation.

4.When S1 and S2 is specified as data registers, the function of DSUBR instruction is the same as API 121 ESUB instruction.

5.S1 and S2 can designate the same register. In this case, if the instruction is specified as “continuous execution instruction” (generally DSUBRP instruction) and the drive contact is ON, the register will be subtracted once in every scan.

6.Flags: M1020 (Zero flag), M1021 (Borrow flag) and M1022 (Carry flag)

If absolute value of the result exceeds max floating point value, carry flag M1022 = ON.

If absolute value of the result is less than min. floating point value, borrow flag M1021 = ON. If the conversion result is 0, zero flag M1020 = ON

Program example 1:

When X0 = ON, subtract floating point number F1.200E+0 (Input F1.2, and scientific notation F1.200E+0 will be displayed on ladder diagram. Users can set monitoring data format as float on the function View) with F2.200E+0 and store the obtained result F-1.000E+0 in register D10 and D11.

X0

DSUBR F1.200E+0 F2.200E+0 D10

Program example 2:

When X0 = ON, subtract the floating point value (D1, D0) with (D3, D2) and store the result in (D11, D10).

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