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Simple program to read write module in STEP7

Created by: max125 at: 4/20/2010 9:31 AM (1 Replies)

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4/20/2010 9:31 AM	Rate (0)
max125 Posts: 1 Rating: (0)	Dear friends, I am new to the world of PLC programming. For testing purpose i want to write a program that can result in calling OB122 From my understanding OB122 is called when there is an error of access voilation. Can someone please help me generate this error. Thanks in advance for your valuable help!
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4/20/2010 10:13 AM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 1/14/2026 Posts: 3054 Rating: (1062)	max125 For testing purpose i want to write a program that can result in calling OB122 Can someone please help me generate this error. Hello max125 A rather unsual request but one that is easily solved. Use so called Peripheral access in your logic to an I/O address that does NOT exist (for which you do NOT have an I/O card). For example:L PIW 128 (or use a LAD/FBD "MOVE" instruction and a non existing PIW or PQW address on it). I hope this helps
	Cheers fritz The advice and opinion given in this thread is that of the author and does not necessarily reflect the views of I S Systems Pty Limited. To find out how I S Systems can help you with your automation needs please visit www.issystems.com.au.
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