WAGO-I/O-SYSTEM 750
Application example: Starterkit880_App1_FUP.pro
37
750-880 ETHERNET Programmable Fieldbus
Quickstart Reference
Version 1.0.0
A 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 of
1.25 Hz.
Figure 34: Blink signal
The clock-pulse generator is implemented using two OFF delays connected in
series, "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 35: Network 1 (Blink)
The signal status sequence for the two OFF delays "tofBlink1.Q" and
"tofBlink2.Q" is illustrated as follows:
Figure 36: Output signals for OFF delays
