Hello, I am in possession of an Allen Bradley 1769-L23E PLC with a 1769-OA16 output card, running on version 20 of the program. However, I do not have the necessary software for it. I am looking to create jog buttons using this setup and I am concerned about applying 120 volts to the output. Would using the same power source while the output is off cause a fault in the PLC? Thank you.
While the PLC itself may not be at fault, applying external voltage can potentially harm the output module. In most cases, PLC outputs are not designed to withstand external voltage. Are you trying to achieve a similar function to the PLC output by paralleling a pushbutton? If so, consider using an interposing relay. This setup involves the PLC output activating the relay coil, which then switches the load in parallel with the pushbutton contact. This method ensures safe and efficient operation of the system.
In similar scenarios, I often employ a NO/NC pushbutton setup for enhanced safety and functionality. Connect the PLC output to a NC contact and the 120V source to a NO contact. Link the contacts together and to your equipment to ensure that pressing the jog button effectively disconnects the PLC from the circuit. This setup not only improves safety by preventing backfeeding but also ensures that the output LED accurately reflects the status of the circuit. It's a smart solution for technicians working in the panel who may not immediately realize if the circuit is being powered by the operator's jog button.
Incorporate an interposing relay into your system by connecting a PLC output to drive the relay coil, which in turn, controls the load. This setup involves wiring the relay contact in parallel with the pushbutton contact, with the load connected on the common side. Connect the pushbutton to the Normally Closed (NC) and Normally Open (NO) terminals for proper operation. Ensure the PLC output drives the relay coil for seamless functionality.
Based on my experience, at no point should you apply 120 volts directly to the 1769-OA16 output card. This card is designed for 24VDC inputs/outputs, which means direct application of 120 volts could potentially cause irreparable damage. If you're planning on controlling a 120VAC device, consider an intermediary like a relay with an appropriate voltage rating. To handle the jog buttons issue, I recommend navigating the digital input to a HMI, which could be created in the software you're planning to acquire. Regarding software, RSLogix5000 or Studio5000 is your best bet to program your PLC. However, always ensure to adhere to safety protocols when doing these installations.
✅ Work Order Management
✅ Asset Tracking
✅ Preventive Maintenance
✅ Inspection Report
We have received your information. We will share Schedule Demo details on your Mail Id.
Answer: Answer: Generally, using the same power source for the PLC output while it is off should not cause a fault. However, it is always recommended to follow the manufacturer's guidelines to avoid any potential issues.
Answer: Answer: It is important to verify the voltage and current ratings of the output card to ensure it can handle the 120 volts safely. Refer to the manufacturer's specifications for guidance on using the output card with higher voltage applications.
Answer: Answer: To program an Allen Bradley PLC, you will need software such as RSLogix 5000. Ensure you have the correct version compatible with your PLC model to create and modify programs effectively.
Answer: Answer: You can create jog buttons by programming the PLC to control the output signals based on the desired jog button inputs. Refer to the PLC programming manual and relevant resources for guidance on programming the jog buttons effectively.
Join hundreds of satisfied customers who have transformed their maintenance processes.
Sign up today and start optimizing your workflow.