Schneider Electric SR2MAN01 user manual Normally open mode, Normally closed mode, Type of timer

LD Language Elements

Use as a Contact The contact associated with the timer indicates whether the timer has stopped.

It may be used 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 timer:

T-

A normally open contact corresponds to the use of the direct state of the output of the Timer function block If this output is active, the contact is said to be conducting.

Normally closed mode:

Symbol of the normally closed contact associated with a timer:

t-

A normally closed contact corresponds to the use of the reverse state (logical

complement of the direct state) of the output of the Timer function block. If this output is active, the contact is said to be non-conducting.

Configuration The block's parameter settings can be accessed either when entering the command from Front Panel line or from the PARAMETERS menu if the block has not been padlocked.

The parameters to enter are the following:

zTimer type,

zPreset value(s),

zTime unit,

zParameter lock,

zLatching.

Type of timer:

This parameter allows you to choose the type of timer function from among the 11 types available. Each type is represented by a letter:

zA: Active, control held down,

za: Active, Press to start/stop,

zC: Off delay

zA/C: Combination of A and C,

zB: On pulse one shot: Pulse calibrated on the command input rising edge,

zW: Timing after pulse: Pulse calibrated on the command input falling edge,

zD: Flasher unit, control held down synchronously,

zd: Flasher unit, Press to start/stop, Synchronous,

zL: Flasher unit, control held down asynchronously,

zl: Flasher unit; Press to start/stop, Asynchronous

zT: Time on addition.

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