Schneider Electric SR2MAN01 Normally open mode, Normally closed mode, Initialization, Latching

LD Language Elements

Use as a Contact An output can be used as an auxiliary contact as many times as necessary.

This contact may use the direct state of the output (normally open mode) or its inverse state (normally closed mode), see below.

Normally open mode:

Symbol of a Discrete output, used as a contact in normally open mode:

Q-

An output used as a normally open auxiliary contact corresponds to the use of the direct state of the output. If it is powered, the contact is said to be conducting.

Normally closed mode:

Symbol of a Discrete output, used as a contact in normally closed mode:

q-

Modifying the Mode of a Coil or a Contact

An output used as a normally closed auxiliary contact corresponds to the use of

the reverse state (logical complement of the direct state) of the output. If it is powered, the contact is said to be non-conducting.

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 mouse on the symbol representing the coil output mode or on the letter of the contact representing the output,

zProceed as indicated in the paragraph Modifying an element,, p. 44, to scroll through the possible modes for coils or contact types possible (Q for normally open contact, q 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.
Latching
	By default, after a power failure, the relay is in the state that corresponds to program
	initialization.
	Activate latching to restore the state of the output backed up during power loss:
	z From the front panel: from the PARAMETERS (see PARAMETERS Menu, p. 51)
	window,
	or
	z In the programming software: Enable the Latching option in the parameters
	window associated with the output.

100 SR2MAN01 11/2007