Schneider Electric SR2MAN01 Example, Modifying the Mode of a Coil or a Contact, Initialization

LD Language Elements

Example	In the following example turning on and off a lamp is conditioned by the status of the
	6 following inputs: I1, I2, I3, I4, I5 and IB.

The is on when:

zThe I1, I4, I5 and IB inputs are set to the state 1, and

zThe I2, I3 are set to state 0.

Because the smart relay does not allow more than five contacts on a line, auxiliary relays are used to control the lamp.

You choose to memorize the state of inputs I1, I4, I5 and IB using the auxiliary relay M1 and memorize the state of inputs I2 and I3 using the auxiliary relay M2. The lamp is controlled by relays M1 and M2, used respectively as normally open contact and as normally closed contact.

Illustration:
I1	I4	I5	IB	M1
001
I2	I3			M2
002
M1	m2			Q1
003

Modifying the Mode of a Coil or a Contact

To modify the operating mode of a coil or a contact from the front panel of the smart relay (the programming window displayed on screen), simply:

zPosition the cursor on the symbol representing the coil mode or on the letter of the contact,

zProceed as indicated in the paragraph Modifying an element,, p. 44, to scroll through the possible modes for a coil or contact types possible (M for normally open contact, m for a normally closed contact).

Initialization	Status of contacts on program initialization:
	z	Normally open mode (direct state) is inactive,
	z	Normally closed mode (reverse state) is active.

96 SR2MAN01 11/2007