Quickstart 750-881 - Wago

36 Application example: Starterkit881_App1_FUP.pro WAGO-I/O-SYSTEM 750750-881 ETHERNET Programmable FieldbusA pulsing signal is generated in the "Blink" subprogram. This blink signal"tofBlink2.Q" is required for the flashing frame around the buttons in the display.The pulse period for this signal is 800 ms, which corresponds to a frequency of1.25 Hz.Figure 33: Blink signalThe clock-pulse generator is implemented using two OFF delays connected inseries, "tofBlink1" and "tofBlink2." This is achieved by linking the output "Q" of"tofBlink1" to the negated input "IN" of "tofBlink2." In addition, the output "Q"of "tofBlink2" is also linked back to the input "IN" of "tofBlink1."Figure 34: Network 1 (Blink)The signal status sequence for the two OFF delays "tofBlink1.Q" and"tofBlink2.Q" is illustrated as follows:Figure 35: Output signals for OFF delaysQuickstart ReferenceVersion 1.1.0