s7 cable

[chad 0]

I am wondering if their is a pin out for a s7-300 serial cable that I can make? can anyone help

[panic mode 246]

the DB9 ports on S7-300 CPUs are not RS232 ports, they are for MPI and ProfiBus. If you are interested in only MPI and Profibus (and Profibus speed not exceeding 1.5Mbps) you may use USB PC adapter. There are some other restrictions (I think you can't use that with servo drives etc.). CP5512 is the best bet and it works up to 12Mbps: http://shop.softwerk.at/images/6GK1551-2AA0x.jpg You still need profibus cable (was not included with my card). sorry, I don't have schematic for CP5512.

[chad 0]

by chance how much is that card?

[Mike Dyble 0]

Just clarify: Siemens MPI protocol is similar to Profibus. The serial or USB cable which Siemens sell contains a protocol convertor which converts the MPI at 187kBaud to 19.2/38.4kBaud for conection to a PC serial port. If its a cable you want have a look at the INAT clones, they are cheaper than Siemens and perform as well or in the case of the case of the serial cable better, as in some applications you can up the speed on the PC side to 115kBaud. So that is why you cannot use a standard RS232 - RS485 convertor

[panic mode 246]

CP5512 should be about $1500, MPI/DP adapters (either serial or USB interface) i'm not quite sure but I think they are in the $500 range, there are alternatives such as IBH but i've never seen one in action. http://www.ibhsoftec-sps.de/english/Select...Hardware_S7.htm http://www.ibhsoftec-sps.de/english/downlo...HNet_Manual.pdf i am curious if they are 100% replacement for CP5512 since I'm not fond of PCMCIA cards and their fragile connector and bulky box on short cable that is attached to it. the IBH solutions seam to be so much better, cost less the only question is what the users have to say about it. btw. if you are gearing up, also check promer (6ES7792-0AA00-0XA0, cost about $1500). all recent CPUs work with small memory card or MMC (special format so you can't get one from BestBuy). I've found the hard way that memory reset switch on the CPU cannot always restore factory defaults (I was using S7-317F CPUs which are safety processors). on the older CPUs they had SRAM with memory backup so this wasn't the issue (clear the RAM and defaults are restored). using promer to erase content of corrupted MMCs does the job (erase, do not format).