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LD Language Elements
SR2MAN01 11/2007 109
Flasher unit, Press to start/stop asynchronously (type l):
The following diagram shows the operation of the type l timer:
Time on addition (type T):
The following diagram shows the operation of the type T timer:
With addition type, the preset value can be reached:
z In one step: t,
z In several steps: t1 + t2 + ... + tn.
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:
z Position the cursor on the symbol representing the coil mode or on the letter of
the contact,
z proceed as described in the paragraph Modifying an element,, p. 44, to scroll
through the possible modes for a coil or contact types possible (T for normally
open contact, t for a normally closed contact).
Initialization State of the contacts and current values on initialization of the program:
z The normally open mode (direct state) is inactive,
z the normally closed mode (inverse state) is active,
z the current value(s) is (are) zero(s).
Note: each pulse on the TTx input resets the current timer value to 0.
t1
RT
TT
T
t2
RT
TT
T
t1 t2 t3t
total activity time: t1 + t2 + t3 = t