Delta Electronics VFD-E manual Add

Appendix D How to Use PLC Function

Explanations:

1.See the specifications of each model for their range of use.

2.This instruction adds S1 and S2 in BIN format and store the result in D.

3.The highest bit is symbolic bit 0 (+) and 1 (-), which is suitable for algebraic addition, e.g. 3 + (-9) = -6.

4.Flag changes in binary addition

16-bit command:

A.If the operation result ＝ 0, zero flag M1020 = On.

B.If the operation result ＜ -32,768, borrow flag M1021 = On.

C.If the operation result ＞ 32,767, carry flag M1022 = On.

Program Example 1:

16-bit command:

When X0 = On, the content in D0 will plus the content in D10 and the sum will be stored in D20.

	X0		ADD		D0	D10		D20
Remarks:
Flags and the positive/negative sign of the values:
16 bit: Zero flag			Zero flag					Zero flag
-2, -1, 0	-32,768		-1,	0	1		32,767		0	1	2
Borrow flag		The highest bit			The highest bit			Carry flag
		of the data			of the data
		= 1 (negative)			= 0 (positive)
32 bit: Zero flag			Zero flag					Zero flag
-2, -1, 0	-2,147,483,648		-1,	0	1		2,147,483,647			0	1 2
Borrow flag		The highest bit			The highest bit				Carry flag
		of the data
					of the data

= 1 (negative) = 0 (positive)

D-52 Revision June 2008, 04EE, SW--PW V1.11/CTL V2.11