Delta Electronics VFD-E manual S 2, S, D Zone Compare

Appendix D How to Use PLC Function

API	Mnemonic			Operands							Function
11	ZCP		P	S1, S2, S, D							Zone Compare
Type	Bit Devices					Word devices					Program Steps
OP	X	Y	M	K	H	KnX	KnY	KnM	T	C	D ZCP, ZCPP: 9 steps
S1				*	*	*	*	*	*	*	*
S2				*	*	*	*	*	*	*	*
S				*	*	*	*	*	*	*	*
D		*	*

Operands:

S1: Lower bound of zone comparison S2: Upper bound of zone comparison S: Comparison value

D: Comparison result

Explanations:

1.The content in S1 should be smaller than the content in S2.

2.Operand D occupies 3 consecutive devices.

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

4.S is compared with its S1 S2 and the result is stored in D.

5.When S1 > S2, the instruction performs comparison by using S1 as the lower/upper bound.

6.The two comparison values are compared algebraically and the two values are signed binary values. When b15 = 1 in 16-bit instruction or b31 = 1 in 32-bit instruction, the comparison will regard the value as negative binary values.

Program Example:

1.Designate device M0, and operand D automatically occupies M0, M1 and M2.

2.When X0 = On, ZCP instruction will be executed and one of M0, M1, and M2 will be On. When X10 = Off, ZCP instruction will not be executed and M0, M1, and M2 remain their status before X0 = Off.

D-48 Revision June 2008, 04EE, SW--PW V1.11/CTL V2.11