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LOGO! functions Press B3 2 Ax =+00010 Ay =–00020 =+00030 Temperature values Q = 1 (differential value > On) View in the message text (example): Ax =+00010 Ay =–00020 Reducing the input response of the analog comparator You can selectively delay the output of an analog comparator by means of the “On-delay” and “Off-delay” special functions. With on-delay, output Q is only set if the pulse width of the triggering signal at input Trg ( =analog comparator output) is longer than the on-delay time. With off-delay, output Q is only reset if the pulse width of the triggering signal at input Trg is longer than the off-delay time. Using this method, you will obtain a virtual hysteresis and reduce the input response to short signals. Function block diagram AI1 AI AI2 AI Analog comparator B1 On-delay A B2 Off-delay B3 Q1 LOGO! Manual A5E00228550-01 169
