Short description
Switch with two different functions:
Pulse switch with off delay
Switch (continuous light)
Connection |
Description |
Input Trg |
A signal at input Trg (Trigger) sets output Q (permanent light) or resets Q with an off-delay. When active, output Q can be reset with a signal at input Trg. |
Input R |
A signal at input R resets the current time Ta and resets the output. |
Parameter |
T: determines the off-delay time. The output is reset (1 to 0 transition) when the time T expires. TL determines the period during which the input must be set in order to enable the permanent light function. T! determines the on delay for the prewarning time. T!L determines the length of the prewarning time period. Retentivity set (on) = the status is retentive in memory. |
Output Q |
Output Q is set with a signal at input Trg, and it is reset again after a configured time has expired and depending on the pulse width at input Trg, or it is reset with another signal at input Trg. |
Parameters T, TL, T! and T!L
The off-delay time T, the permanent light time TL, the on-delay prewarning time T!, and the prewarning time period T!L can be provided by the actual value of another already-programmed function:
Analog comparator: Ax – Ay
Analog trigger: Ax
Analog amplifier: Ax
Analog multiplexer: AQ
Analog ramp: AQ
Analog math: AQ
PI controller: AQ
Up/Down counter: Cnt
You select the required function by the block number.
Timing diagram
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0BA2, 0BA3: Only the TL and T parameters exist. The output is reset when T has expired. TL determines the period during which the input must be set in order to enable the permanent light function. Input R is not available to the user.
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Description of the function
Output Q is set to 1 with a 0 to 1 signal transition at Trg.
If output Q = 0, and input Trg is set hi for at least the duration of TL, the permanent lighting function is enabled and output Q is set accordingly.
The off-delay time T is triggered when the status at input Trg changes to 0 before the time TL has expired.
Output Q is reset when the Ta = T.
You can output an off-warning signal prior to the expiration of the off-delay time (T - T!) that resets Q for the duration of the off prewarning time T!L. A subsequent signal at input Trg always resets T and output Q.
Caution
The time base for T, T! and T!L must be identical.