Hello everyone! I’m working on creating an alternating output and would appreciate some guidance. I've been exploring various forums discussing flip flops and toggle mechanisms, and I came across this helpful resource: [Creating a Flip Flop Circuit in the PLC](http://accautomation.ca/creating-a-flip-flop-circuit-in-the-plc/). It seems to align with my needs, but I’m unsure how to implement it effectively on ControlLogix. I attempted to use One-Shot (ONS) logic and similar approaches, but I'm not achieving the desired results. Essentially, I need to configure the system so that when a joystick button is pressed, it activates Output 1 on the first press and Output 2 on the second press, while simultaneously deactivating the previously activated output. Any insights or best practices would be greatly appreciated!
The logic demonstrated on that website should be functional. However, for the ONS (One-Shot Instruction) implementation, you'll need to establish a bit in the BIT and ONS PULSE configuration: ``` BIT ONS PULSE-||-----[ONS]----------------(OTE) ``` Afterward, utilize the OTE address along with an XIC, where the X0 One-Shot instruction is used. It's worth noting that I’m unsure if this particular instruction is available in ControLogix; in my experience transitioning from the 500/Micro platform, I’ve never encountered it. This guide can help optimize your PLC (Programmable Logic Controller) programming skills and ensure successful integration for your projects.
Check out the informative thread on ONS instruction available at this link: http://www.plctalk.net/qanda/showthread.php?t=35790. It provides a detailed explanation of the ONS (One-Shot) instruction. Best regards!
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When selecting a method for managing toggled bits in your processor, it's crucial to consider how these bits behave during a restart, whether due to a power outage or a change in processor mode. Many common examples will reset toggled bits to their default state, which may not align with your preferences. Personally, I recommend using a method that consistently retains the state of toggled bits, while also allowing for specific resets when needed. This way, the programmer retains control, independent of the hardware. To achieve this, I utilize a counter driven by the toggling input. The least significant bit (bit 0) of the counter's accumulator alternates with each toggle input, eliminating the need for a one-shot. Although the counter's value will eventually "rollover" after 2,147,483,647 counts, this is not a concern as it will continue counting indefinitely, with bit 0 reliably switching between 0 and 1. You can disregard the actual value in the accumulator. Notably, this counter operates as a "retentive" instruction, ensuring that the accumulator’s state is preserved even through power cycles or changes in processor mode. By implementing this strategy, you can effectively manage toggled bits without losing their state during critical transitions.
Daba expressed: "My preferred approach involves utilizing a method that consistently tracks the state of toggled bits. I can program a specific reset for these bits if I don't want their status retained after a processor reboot. This puts the decision-making in the hands of the programmer, rather than relying on hardware constraints. I implement a counter that responds to the 'toggle' input. The accumulator's first bit (bit 0) toggles between on and off with each toggle input, eliminating the need for a one-shot timer. While the counter's accumulator will eventually 'roll over' after reaching 2,147,483,647 counts, this limitation is not a concern; it will continue to count indefinitely, and bit 0 will consistently alternate between 0 and 1. Simply disregard the actual value held in the accumulator. This counter uses a 'retentive' instruction, ensuring that the accumulator's state is preserved even through power cycles or mode changes." This is an excellent example of straightforward logic implementation, which is why I follow PLC.net for practical tips. Best regards, Sydney. **Keywords:** toggled bits, processor reboot, programmer decision-making, toggle input, counter implementation, retentive instruction, power cycle preservation, PLC logic tips.
Hi there! It sounds like you’re on the right track with using the One-Shot (ONS) logic, but have you considered using a state-based approach? You could create a simple state machine that tracks whether Output 1 or Output 2 is currently active. Each time the joystick button is pressed, you would toggle the state and activate the corresponding output while turning off the other. This way, you can streamline your control logic and ensure that both outputs are managed effectively without any overlap issues. Also, make sure to debounce the joystick input to avoid multiple triggers from a single press—it can really help with reliability. Good luck, and keep us posted on your progress!
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