Posted 10 Mar 2017 (edited) Thank you for allowing me post here. I have a PLC SLC5/04, I usually connect to PC using DF1 (RS232 port). But recently, I had to use DH485 to connect to a new touchscreen. Now, After setting RS232 port to DH485( In Channel Configuration/Channel 0-System). I couldn't connect to PC using RS232 port. In RS Linx, I tried both "DH485 UIC devices" driver and "RS-232 DF1 devices" driver, but the PC couldn't recognize SLC5/04. Did I do something wrong? Edited 10 Mar 2017 by YVN_Group Share this post Link to post Share on other sites
Posted 10 Mar 2017 I'm guessing you are using a USB to RS232 adapter? If so you won't be able to go online with the SLC 5/04 bottom port after switching to DH485 without a 1747-UIC or clearing the PLC program. Here is how to clear the program from your PLC https://www.theautomationstore.com/clearing-memory-from-an-allen-bradley-slc-500-including-passwords/ And here is a 1747-UIC https://www.theautomationstore.com/allen-bradley-slc-500-programming-cable-usb-to-dh485-1747-uic/ Share this post Link to post Share on other sites