Schneider Electric SR2MAN01 user manual

Implementing a Basic Application

Other Elements Other elements are also available using a smart relay, such as:

zTimer function block: Used to delay, prolong and control and action for a set length of time,

zCounter function block: Used to count the pulses received on an input,

zClock function block: Used to trigger or release actions on precise days or at precise times,

zAnalog comparator function block: Used to compare an analog value with a reference value or with another analog value after allowing for a hysteresis factor,

zAuxiliary relays: These are used to save or relay the status of the smart relay,

zZx keys: After confirming this function, Z keys may be used as pushbuttons,

zFast counter function block: The fast counter function is used to count pulses up to a frequency of 1 kHz.

zLCD screen back-light function block: This is used to control the backlighting of the LCD by a program,

zSummer/winter time change function block: The output of this function is in an OFF state over the entire duration of winter time, and switches to ON for the entire duration of summer time,

zCounter Comparator block: This function is used to compare the current counting values of two counters,

zText block: This is used to display text or numerical values (current value or preset value).

Note: Blocks Counter Comparator and Text are not programmable from the front panel.

Note: For the list of all ladder diagram elements available when using smart relays, as well as details on their functions and parameters, see the chapter entitled LD Language Elements, p. 87.

156 SR2MAN01 11/2007