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MODBUS TCP PN

Created by: ZZZavist' at: 12/16/2022 2:49 PM (6 Replies)

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12/16/2022 2:49 PM	Rate (0)
ZZZavist' Member Joined: 5/3/2022 Last visit: 12/17/2022 Posts: 4 Rating: (0)	Alright guys! Here is the Thing(SIMATIC MANAGER, CPU 412-5 H PN/DP). I have some problems with a MODBUS data area expansion. There is a db wich is called "DB MODBUS PARAM". For example, there is empty fields like data type,db, start,end. So, i created DB666, entered data type and so on, but after downloading param db i can't poll these addreses("MODBUS POLL" software, "illegal data area" error, moreover i can't see my changes in "DB MODBUS PARAM" (in online), there is still empty fields. Could someone please help me out?

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12/16/2022 2:55 PM	Rate (1)
Wüstenräuber Gold Expert Joined: 10/3/2008 Last visit: 3/10/2023 Posts: 934 Rating: (120)	Hi, the MODBUS_PARAM block is for the parameterization, which registers should be mapped in which datablocks. When it doesn't work, have a look at the ERROR and STATUS values of the block for the reason. And have a look at the manual or the block online help (F1) or the example project. Wüstenräuber

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12/16/2022 3:22 PM	Rate (0)
ZZZavist' Member Joined: 5/3/2022 Last visit: 12/17/2022 Posts: 4 Rating: (0)	i clearly understand that PARAM DB for the parameterization. It is already configured. SO, there's two db's (1 and 2 for example) for holding reg 100 adrdeses each. I'm trying to add third db for holding reg with adress starting from 200 to 299, but after modification made and downloading to cpu it's still has default fields in online view. I can read and write previously configured regs but since my modifications wasn't made i can't poll anything new. So how to change db properly?

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12/16/2022 3:24 PM	Rate (0)
Wüstenräuber Gold Expert Joined: 10/3/2008 Last visit: 3/10/2023 Posts: 934 Rating: (120)	The entries in the parameter DB are initialization parameters. You must execute the init again.

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12/16/2022 3:35 PM	Rate (0)
ZZZavist' Member Joined: 5/3/2022 Last visit: 12/17/2022 Posts: 4 Rating: (0)	I was changing initial values in PARAM DB in STOP mode and then downloaded it to CPU. After that i switched cpu in run mode and watched actual values in online and they are different, not initial.

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12/16/2022 3:39 PM	Rate (0)
Wüstenräuber Gold Expert Joined: 10/3/2008 Last visit: 3/10/2023 Posts: 934 Rating: (120)	Then check the ERROR/STATUS output, what is shown. And when you change the parameter datablock manually (without the wizard), you must change it in data view AND in declaration view. And check, which version of block do you use: with initialization via restart of CPU or with init bit. If you use the init bit, then check the programming.

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12/17/2022 10:17 PM	Rate (0)
ZZZavist' Member Joined: 5/3/2022 Last visit: 12/17/2022 Posts: 4 Rating: (0)	Thank you for advices, i've managed all this mess. Thanks alot.

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