Hello, I am currently conducting comprehensive testing and commissioning on a variety of new Emerson PACSystems RX3i PLCs. I am looking to simulate or force an analog input reading, but it appears that only digital inputs, outputs, and analog outputs can be forced. Is there a way to force analog inputs as well? I am using PAC ME, and I have tried right-clicking on a field in the %AI memory table and selecting the "Write" option to input a number, but it does not seem to accept it. Thank you.
It is true that analog inputs cannot be forced. However, a solution could involve altering the hardware configuration during commissioning and assigning a new %AI address to the analog input module. This allows you to input any desired value to the original %AI address in the logic. Be sure to revert to the correct address once testing is finished to avoid any issues. This method can help in managing analog inputs efficiently.
Steve Bailey agrees that it is impossible to manipulate analog inputs. However, as you are in the commissioning phase, a workaround could be changing the hardware configuration to assign a different %AI address to the analog input module. This way, you can write any desired value to the original %AI address in logic. Remember to revert to the correct address once testing is done. This method involves remapping the pointers for the AIs to a memory area that can be edited freely. To view memory contents, the best approach is to access a map or profile indicating which memory areas are used or available. While the Report generator function is an option, it may not provide all the desired information.
Are you suggesting that we should remap the pointers/references for the AIs to a customizable memory area? It might be better to consider relocating the AI module to a different address, while keeping the ladder logic intact. This way, the PLC can update data from the module without affecting your test values.
Steve Bailey proposed a solution to avoid overwriting data while working with the AI module in a PLC system. His suggestion involves remapping the AI module to an unused memory address, allowing the ladder logic to remain unaffected. By implementing this change, the PLC will be able to refresh data without interfering with the values used for testing. Understanding this concept led to a revision in approach, seeking guidance on effectively managing memory usage and assigning an appropriate address for the AI module.
Looking for an available analog input address? Just type in "%AI" without a specific address. The software will automatically assign the next unused address by keeping track of the highest address used. No need to worry about filling in gaps with this convenient feature.
Hi there, I've also had similar experiences with the limitations of forcing inputs in Emerson PACSystems RX3i PLCs. If I'm not mistaken, forcing Analog inputs directly via PAC ME isn't possible due to the real-time nature of these types of inputs. A typical workaround I use is to create a software simulation of the analog input in the PLC ladder logic. In that way, the simulated value can be manipulated while detaching it from the actual hardware signal when in simulation or test mode. Still, I would suggest reaching out to GE's support for more concrete advice. They may have a better solution or updates regarding this matter.
Hi there! It's true, forcing analog inputs directly like you can with digital inputs or outputs isn't generally a feature in most PLCs, including the Emerson PACSystems RX3i you're working with. However, one possible workaround could involve creating a software interlock in your PLC program that allows you to bypass the real-world analog input signal, replacing it with a simulated value for testing purposes. Make sure the interlock can only be activated in a safe mode or testing environment to avoid unwanted outcomes during routine operations. Always double-check and confirm changes to ensure system safety and performance.
✅ 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: 1. Can analog inputs be forced on Emerson RX3i PACSystems? - No, it appears that only digital inputs, outputs, and analog outputs can be forced on Emerson RX3i PACSystems, not analog inputs.
Answer: - Unfortunately, there is no direct method to force analog inputs on Emerson PACSystems RX3i PLCs. Analog inputs cannot be forced using the PAC ME interface.
Answer: - Digital inputs, digital outputs, and analog outputs can be forced on Emerson RX3i PACSystems, but analog inputs cannot be forced through the PAC ME interface.
Join hundreds of satisfied customers who have transformed their maintenance processes.
Sign up today and start optimizing your workflow.