Delta Electronics Programmable Logic Controller DVP-PLC - Manual (Page 441)

8 Application Instructions API 100-149
DVP-PLC Application Manual 8-39
API Mnemonic Operands Function
127 D ESQR P Floating Point Square Root
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 *
DESQR, DESQRP: 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 : Source device D: Operation result
Explanations:
1. Range of S : ≥ 0
2. See the specifications of each model for their range of use.
3. Flags: M1020 (zero flag); M1067 (operation error)
4. This instruction performs a square root operation on the content in the register designated by S and stores the
result in the register designated by D. The square root operation is performed in floating point system.
5. If S is an designated constant K or H, the instruction will convert the constant into a binary floating point value
before the operation.
6. If the result of the operation = 0, the zero flag M1020 = On.
7. S can only be a positive value. Performing any square root operation on a negative value will result in an
“operation error” and this instruction will not be executed. M1067 and M1068 will be On and D1067 will record
the error code H’0E1B.
Program Example 1:
When M0 = On, calculate the square root of the binary floating point (D1, D0) and store the result in register (D11,
D10).
D0 DESQR
X0
D10
(D1, D0) (D11 D10) ,
binary floating point binary floating point
Program Example 2:
When M2 = On, calculate the square root of K1,234 (automatically converted into binary floating point) and store the
result in register (D11, D10).
K1234 DESQR
X2
D10
Remarks:
For floating point operations, see “5.3 Handling of Numeric Values”.