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immediate access of i/os of s7300 plc

Created by: sapnanavre at: 1/24/2014 12:38 PM (1 Replies)

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1/24/2014 12:38 PM	Rate (0)
sapnanavre Posts: 55 Rating: (0)	Dear Expert We have s7300 plc cpu315-2 PN/DP and s71200 plc cpu1214 dc/dc/rly in lab. In s71200 plc for immediate accessing the input/output we can put ":P" at the end of corresponding tag so that i/os will be read write directly from source instead of from input or output memory image of plc. But in s7 300 plc to make input/outputs immediate when we append ":P" to input/output tags, it doesn't support it. can you help us how we can make i/os immediate in s7300 plc so that it will always immediately read or write those i/os without waiting for scan cycle. Please help thank you
sapnanavre Posts: 55 Rating: (0)
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1/24/2014 1:07 PM	Rate (0)
Marcjan Platinum Member Joined: 4/22/2010 Last visit: 12/15/2022 Posts: 5697 Rating: (701)	Hello, With the 1200 system you can read with :P at bit level. with the 300 system minimum you can read is Byte. Have a look at: Where and when do you need peripheral addressing? There is some more explanation of the P area off the 300/400 system and how to handle it. Regards, Marcjan
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