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Siemens S5

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Please help, I have a siemens s5 100u cpu102 plc, I am using simatic v7 software, I can transfer pb1 from plc to pc but when i go to transfer pb1 from pc to plc i get the message - Block list does not exist in plc I also get the message block not processed, when I testing block status. can anyone help?

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You first have to program OB1. In OB1 you then have to "call" PB1 OB1 is the main block, It calls all the other blocks. OB1 = Organisation Block. In Ob1 your program should be.... JU PB1 BE JU = Jump Unconditional (to ) BE = Block End. please email me if you need more info. Steve steve@plcman.co.uk http://www.plcman.co.uk

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The S5-102cpu has 2 modes. In the high speed mode (where you are), you cannot see the blocklist, modify or go into status mode. You must put the CPU in Stop to see the program. Do you have a EEprom in it? If so, there is a way to download the new block and save it to the EEprom. But, it is done in the stop mode.

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