Delta DVP-ES2 - Manual (Page 420)

D V P - E S 2 / E X 2 / S S 2 / S A2 / S X 2 / S E O p e r a t i o n M a n u a l - P r o g r a m m i n g
3-304
API Mnemonic Operands Function
121 D ESUB P Floating point subtraction
Controllers
ES2/EX2 SS2 SA2
SE
SX2
Bit Devices Word devices Program Steps Type
OP X Y M S K H KnX KnY KnM KnS T C D E F
S
1
* * *
S
2
* * *
D *
DESUB, DESUBP: 13
steps
PULSE 16-bit 32-bit
ES2/EX2 SS2
SA2
SE
SX2 ES2/EX2 SS2
SA2
SE
SX2 ES2/EX2 SS2
SA2
SE
SX2
Operands:
S
1
: Minuend S
2
: Subtrahend D: Subtraction result
Explanation:
1. S
1
− S
2
= D. The floating point value in S
2
is subtracted from the floating point value in S
1
and
the result is stored in D. The subtraction is conducted in binary floating point format.
2. If S
1
or S
2
is designated as constant K or H, the instruction will convert the constant into a
binary floating point value before the operation.
3. S
1
and S
2
can designate the same register. In this case, if the instruction is specified as
“continuous execution instruction” (generally DESUBP instruction) and the drive contact is ON,
the register will be subtracted once in every scan.
4. 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, binary floating point value (D1, D0) minuses binary floating point value (D3, D2) and
the result is stored in (D11, D10).
D0 DESUB
X0
D2 D10
Program Example 2:
When X2 = ON, K1234 (automatically converted into binary floating point value) minuses binary
floating point (D1, D0) and the result is stored in (D11, D10).
K1234 DE SUB
X2
D0 D10