Hi,
I am an electrician from Suriname, South-America and I am new to PLC's. I installed a new Allen-Bradley slc504 processor on an existing 13 rack system and could connect fine using rslinx2.2 autoconfigure. Because I didn't have a softcopy of the program I downloaded the program from a memory module (1747-m3). The download from the memory module was performed succesfully.

After the download I tried to connect again using the autoconfigure, but this time it failed. It gave this message "Failed to find the Baud and parity! Check all cables and. switch settings”. When I reset the processor to factory setting using the instructions in the processor manual, I managed to connect, still using the autoconfigure option. This slc-504 is used on a Besser Block machine.

Please could you help me with a solution, it would help me a lot in trouble shooting this machine.

Thank you!!

Randy.

 

Randy,
Is it possible that the program you just download redefine the RS-232 as a non-programmning port?

 

I would bet that in the memory module the serial port is set to be dh485 rather than df1. try using the pic driver to talk to it instead of the df1 driver.

 

Thanks Anonymous.

"Is it possible that the program you just download redefine the RS-232 as a non-programmning port?"

Could you tell me how I can check that? I don't have any soft version of the program.

Thanks Bob.

"I would bet that in the memory module the serial port is set to be dh485 rather than df1. try using the pic driver to talk to it instead of the df1 driver."

I will try that. I only work on the slc during the weekends. The machine is working during weekdays.

 

You could try to connect to SLC via RS232 cable (type 9-pin female 2-3, 3-2, 5-5), and using RSLinx. Be sure that your cable is correct. If connecting is not sucessful, your Processor may be dead!

 

Bob,

I've tried using the PIC-driver but still no luck. But will this driver work with the serial1747-c13 cable? Uploading the program from the memory module would also be helpfull. From there I can change the driver I think and download it back to the processor. That way I'm connected easier.

Randy

 

Randy,
The PIC-driver is used for the DH485-Serial adapter from AB, which is for SLC500 (shoeboxes), SLC5/01, SLC5/02 and SLC5/03. Not SLC5/04's which are DH+. The serial cable uses the serial DF-1 driver, if you had a PCMK (PCMCIA
card) or a PKTX/KTX (PCI/ISA cards) then you select the alternate driver to suit.