Hello everyone, I am currently facing issues with establishing an online connection with a SLC 5/02 processor. I am utilizing a 1747-UIC adapter that enables USB to serial and DH485 or RS485 connections to the processor. Despite briefly connecting with RSLinx yesterday, I am now unable to establish a stable connection, possibly due to a faulty CPU indicated by a flashing Fault LED. In the brief moment when the PLC appeared in RSLinx, it reported that it could not go "online" with the PLC and suggested a download as the only option. However, even with the .RSS user program available, the download attempt was unsuccessful, and since then, the PLC is no longer visible in RSLinx. Reflecting on a past successful experience extracting the program from the CPU using the 1747-UIC a couple of years ago, I am questioning if I used a simple ethernet patch cable for connectivity. Regarding the RJ-45 cable required for connecting the 1747-UIC adapter to the PLC, AB specifies it should be a 1747-C13. Is this a standard ethernet patch cable? Can anyone provide a pinout for this cable?
It is important to use a straight C13 cable with the number 3 (or 2) pin removed to avoid damaging your PC. Do not use a crossover cable as it could cause damage. The PLC's COM port has 24vdc, and using the wrong cable could release magic smoke from your PC. If your PLC is not connecting, try downloading a blank default program. If the issue persists, check your COM settings or reset the CPU to restore communication.
A user named geniusintraining mentioned that the C13 cable should be straight with the number 3 or 2 pin removed. It is important to avoid using a crossover cable and ensure that the PLC's COM port has 24vdc to prevent damaging your PC. If you encounter issues, try downloading a default blank program to test the COM settings. If the PLC does not flash, you may need to reset the CPU to restore the COM ports. It seems like geniusintraining has also experienced the "let the smoke out" phenomenon, just like many others have. The DH port (RJ45) indeed has voltage running through it.
One common frustration when electronic devices malfunction is releasing the "magic smoke." Unfortunately, once the magic smoke escapes, it's quite a challenge to recapture it.
A user named geniusintraining pointed out that the C13 connector is straight but with the third (or second) pin removed. The image below shows that the third pin is removed on both sides.
The lack of proper overvoltage protection on the Rockwell 1747-UIC for handling 24v input through a standard ethernet cable is puzzling. This oversight has resulted in instances where the 1747-UIC has been damaged due to using an ethernet cable instead of the recommended C13 cable. It seems like a relatively simple fix that could prevent potential damage to the device.
Hey there, I've worked with the SLC 5/02 and the 1747-UIC adapter before. To answer one of your queries, no, the 1747-C13 is not a standard Ethernet patch cable. It's a specific cable needed to connect your 1747-UIC adapter to the SLC 5/02 processor. The pinout for this cable is custom and specific to AB. If you are not using a 1747-C13, that could be the issue right there. Also, just to add, if you are getting a faulty CPU indicator, meaning a flashing LED, it may be beneficial to check the processor's error codes to identify any potential issues. The manual should guide you on how to do this. Wishing you the best of luck in resolving this.
Hi there! Let me try to clear some things up for you. The 1747-C13 is not a standard ethernet patch cable; it's a specialty cable made by Allen-Bradley designed specifically for connecting devices like your SLC 5/02 processor to the 1747-UIC adapter. It's possible that using a standard ethernet patch cable could be causing some of the communication issues you are experiencing, given the proprietary nature of the 1747-C13. As for the pinout, each end of the 1747-C13 cable has an 8-pin RJ-45 connector. The connections are straight through: pin 1 to pin 1, pin 2 to pin 2, going up to pin 8. In the meantime, you might want to pay attention to the blinking pattern of your Fault LED; it might provide some insight into any potential CPU issues. Hope this helps!
Hey there! It sounds like you’ve been through quite a frustrating process with the SLC 5/02. Regarding the 1747-C13 cable, it is indeed a standard RJ-45 cable, but it's specifically configured for DH485 communications, which means it might have different pinouts compared to a typical Ethernet cable. If you're having connection issues, I’d recommend double-checking the cable connections and ensuring you're using the right pinout. As for the flashing Fault LED, that can indicate a hardware issue with the CPU, which might explain the connectivity problems. Have you tried resetting the CPU or checking the power supply to rule out simple issues? Good luck!
It sounds like you're dealing with a frustrating situation! The 1747-C13 is indeed a specific cable designed for the 1747-UIC to connect with the SLC 5/02, and while it looks similar to a standard Ethernet patch cable, the pinouts are actually different, so using a standard patch cable might not work. If you're dealing with a faulty CPU, that could certainly hinder the connection stability and visibility in RSLinx as well. I’d recommend checking the cable connections and maybe trying a different 1747-C13 if you suspect it might be an issue. And if you’re comfortable doing so, you might want to look into resetting the processor to see if that helps clear any faults and allows a successful connection. Good luck!
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Answer: The issue could be related to a faulty CPU indicated by a flashing Fault LED.
Answer: This indicates that there may be an issue with the connection or the program in the PLC.
Answer: You should use a 1747-C13 cable, which is not a standard ethernet patch cable. AB specifies the specific cable required for this connection.
Answer: A specific pinout for the 1747-C13 cable can be provided for proper connectivity between the adapter and the PLC.
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