Posted 15 Oct 2019 Hi everyone. I am new to the forum but not new to plcs, I’ve used other models of Allen-Bradley’s as well as Siemens and this simple program has me stuck. I am using the AB Micro850-2080-LC50-24QWB controller with an analog card- 2080-IF2. what I am wanting to do is simulate an alarm system for an analyzer shelter. This is pretty simple, Press the test PB AND 3 LEDs come on as well as a strobe light. The strobe is simulating a horn. The second part is, I am using an analog signal generator, at 12mA or more, the second set of 3 LEDs and the strobe will come on. Pressing the reset button will reset the LEDs and pressing the Horn acknowledge button will deenergize the strobe. However, I am stuck on getting the strobe to deactivate while the signal generator is at or above 12 mA, and yes I want to be able to de-activate the strobe while the signal generator is still activating this output. I think I should be using the LIM_ALRM function within the program but I am not sure. Can anyone tell me is it possible to make this condition or should I use the function? Thanks! Share this post Link to post Share on other sites
Posted 16 Oct 2019 Are you using function block diagrams? Share this post Link to post Share on other sites
Posted 16 Oct 2019 No, just standard ladder logic. I found a solution to this tho, I made the condition where when the signal generator reaches 12mA, the output bit is a one shot rising pulse. That solved everything. I knew it was something simple Share this post Link to post Share on other sites