BG Logic - set a signal on and off for amount of time

    Hello,

    I've been thinking lately if there's a possibility to set a signal on and off variably, e.g. 2 seconds.

    I want to use a bg logic program because everytime a TP is on (SO [7]) - the light flashes for 2 seconds (On for 2 secs, off for 2 secs and so on).

    I could easily do it using Wait() but in bg logic it's impossible to use wait instruction.

    • Best Answer

    An easy way to time in BG logic is to constantly increment a counter. The counter value will equal the number of scans. So if your scan time is 8 ms then 250 scans = 2 seconds. When your counter reaches 250 reverse your output state and reset the counter to 0. Now you have a flashing output.

    But won't this work for 2 secs only when the light is on? I want it to be off for 2 secs too.

    Edit: nevermind I already got that working by adding another counter. Thanks for help.

    Edited 2 times, last by Nvm123 (September 27, 2019 at 12:56 PM).

    Tip#1: Use heartbeat signal and small logic to do it.

    Tip#2: Use $FAST_CLOCK internal system clock to count 2 sec and do what you need.

    Tip#3: Use TIMERS

    Timer probably the easiest way. Just do smth like this

    IF TIMER>0 AND TIMER<2

    stay ON

    ENDIF

    IF TIMER>2AND TIMER<4

    stay OFF

    ENDIF

    IF TIMER>4

    TIMER RESET

    ENDIF

    I am very new to the robotics field and want to use BG Logic. I have a similar problem as you had.

    I want to create a heartbeat as soon as the cycle starts. I had read all the suggestions below but was not able to code it correctly in my tp.

    Can you please tell me how did you used the counter with a proper syntax.

    Thanks in advance.

    Quote from akay98

    I am very new to the robotics field and want to use BG Logic. I have a similar problem as you had.

    I want to create a heartbeat as soon as the cycle starts. I had read all the suggestions below but was not able to code it correctly in my tp.

    Can you please tell me how did you used the counter with a proper syntax.

    Thanks in advance.

    Fanuc have a heartbeat. Menu > I/O > Cell Interface

    Counter with Fanuc heartbeat:

    pasted-from-clipboard.png

    DO[1000] = Fanuc heartbeat

    F[1] = Auxiliar flag

    Edited once, last by theRoach (October 17, 2022 at 1:01 PM).

    Quote from akay98

    I am very new to the robotics field and want to use BG Logic. I have a similar problem as you had.

    I want to create a heartbeat as soon as the cycle starts. I had read all the suggestions below but was not able to code it correctly in my tp.

    Can you please tell me how did you used the counter with a proper syntax.

    Thanks in advance.

    As scotty already said, use fanuc heartbeat signal.

    Press the [MENU] key and select "I/O". Then press F1, [TYPE] and select "Cell Interface". In the output screen ("IN/OUT") you will find “7 Heartbeat signal”. 7 Heartbeat signal. To allocate the signal, press F2, "CONFIG".

    If you want change “Heartbeat timing”:

    Press the [MENU] key. Select “6 SETUP” then "1 Prog Select". Type value in milliseconds.

    For more information, please refer to the OPERATOR’S MANUAL (Basic Function) B-83284EN/10.

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