Schneider Electric SR2MAN01 user manual Normally open mode, Normally closed mode

LD Language Elements

Use as a Contact The contact associated with the counter indicates whether the preset value (TO mode) or zero (FROM mode) has been reached.

It may be used as many times as necessary as many times as necessary in the program. It may be used according to 2 modes: normally open or normally closed, described below.

Normally open mode:

Symbol of the normally open contact associated with a counter:

C-

The contact is conducting when:

zThe current counter value has reached the preset value, if the counter is in TO mode (upcounting mode),

zThe current counter value is equal to 0, if the counter is in FROM mode (downcounting mode),

Normally closed mode:

Symbol of the normally closed contact associated with a counter:

c-

The contact is conducting as long as :

zThe current counter value has not reached the preset value, if the counter is in TO mode (upcounting mode).

zThe current counter value is not equal to 0 if the counter is in FROM mode (downcount mode).

Example: Lighting a LED connected to counter no. 1 output (TO mode).

C1 [ Q1

When the preset value has been reached: The LED is lit; otherwise it is off.

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