Operated by SLC 505 on a Devicenet network, I am troubleshooting potential issues with the connectors to a valve that is not extending the actuator properly. Even though the output shows as latched and the retract output is unlatched, the valve's light remains off when it should be on. Is there a way to reassign the output to a different valve on the block using the controller without solely relying on physical rewiring of inputs?
The SMC block is responsible for addressing signals. To change the output to a different location in the address word, adjust the address accordingly. For single-acting setups, only one address needs to be modified, while dual-acting systems require address changes in pairs. Remember to also adjust the air hose when making these changes. If you suspect a faulty output block, try swapping blocks while keeping the addressing and air lines unchanged. The status light can indicate the signal is functioning, but a malfunctioning internal shuttle within the solenoid or a broken actuator could be the issue. Consider checking for airflow by disconnecting the air lines from the actuator and testing the extend and retract hoses.
Robertmee advises that addressing is key when dealing with the SMC block. For single-acting setups, only one address needs to be changed, while for dual-acting systems, addresses should be modified in pairs. It is important to also adjust the air hose accordingly. If troubleshooting a potentially faulty output block, try swapping the blocks without altering the addressing and air lines. An on/off light signal indicates that the signal is functional, but issues may lie within the internal shuttle of the solenoid or the actuator itself. Check for airflow by disconnecting the air lines from the actuator to test alternating extend and retract hoses. In the output file, simply adjust the latches for O:1.23/4 and O:1.23/5 to O:1.23/8 and O:1.23/9 to move down 4 spaces through the 1747-SDN. As the system is dual-action, investigate the wiring on the manifold for any potential issues, especially if the wire harness was damaged during block swapping. Consider the possibility that the connection damage may be preventing the extend command from going through. Your thoughts on this being highly unlikely or impossible are appreciated.
In the field, I simply physically switch the two separate manifold blocks by loosening a few screws. In my experience, this task is typically straightforward and only requires a basic adjustment.
Crimznn inquired about the process of making changes in the output file, specifically regarding moving down the block and changing outputs on latches to address a potential issue with the wiring on the manifold. It is important to consider potential damage to the wire harness during block swaps, as it could impact the ability of the extend command to go through. It is advisable to check the SMC manifolds, which are typically modular and equipped with communication modules like devicenet, ethernet, or profibus. In cases of damage, it is recommended to swap solenoid modules first to rule out any issues with the block or actuator. Alternatively, removing the air lines from the actuator can help determine if the solenoid block is functioning properly.
I appreciate everyone's input on this issue. Upon further examination, I discovered that the wiring harness connected to the block was causing the problem after the block was swapped again. Despite only being able to operate the actuator in one direction, manually toggling the buttons was still effective. By relocating the outputs and lines to a different, unused block, I was able to resolve the issue.
To resolve your issue, you could definitely attempt to reassign the output to a different valve on the block using your SLC 505 controller's software. The key is to make sure you're configuring it properly according to your exact needs and requirements and ensure you have clearly defined your output valve channels. Remember though, this only temporarily bypasses the problem and won't address the potential hardware fault. It's best to ultimately troubleshoot what is causing the valve's light to stay off, be it a wiring issue or a fault with the valve itself.
It certainly sounds like a tricky issue you're dealing with. In terms of reassigning outputs using the controller, I believe it's possible with RSLogix 5000 if your controller allows it. You can create or adjust your program to put the desired output to a spare output channel on the module. You would then physically move the plug to the new output. It’s like a software-controlled rewiring. However, I would also verify the coil to the valve for any potential issues. Sometimes, stubborn issues like these are due to simple electrical issues, so it's definitely worth checking out.
It sounds like you’re dealing with a tricky issue! If the output for your valve is latched in the PLC but the actuator isn't responding, one thing you could try is using the I/O configuration settings in your SLC 505 to see if you can reassign the outputs within the controller logic. Check if there's a program instruction that allows you to change the output mapping for that specific block without needing to rewire physically. Sometimes, toggling the output assignments or using a different address for the valve can help narrow down the problem. Also, ensure that the communication across the DeviceNet network is stable, as any interruptions could affect the output signals too. Good luck troubleshooting!
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Answer: To troubleshoot valve actuation issues, check the connectors, ensure the output is latched, and verify the retract output is unlatched. If the valve's light remains off when it should be on, further investigation is needed.
Answer: Yes, it is possible to reassign the output to a different valve using the controller without solely relying on physical rewiring. This can be done through programming and configuration adjustments.
Answer: The issue could be related to wiring connections, controller settings, or potential faults in the pneumatic system. Further troubleshooting and inspection are necessary to pinpoint the exact cause of the problem.
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