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Can anyone tell me what address to put in DATA_ADDR in S7-1200 MB_MASTER function block, if I want to read process data?

1/15/2011 12:39 AM	Rate (0)
Homeroid_BL Posts: 211 Rating: (6)	Hello all! Can anyone tell me what address to put in DATA_ADDR in S7-1200 MB_MASTER function block, if I want to read process data? Data lenght will be 24(words), I suppose. And, in MB_MASTER function block, will DONE (or NDR) signal remain TRUE until next REQ pulse, or it will be TRUE for one cycle only? Best regards and thanks. Splitted from How to handle data ?.
Homeroid_BL Posts: 211 Rating: (6)	Last edited by: O_Moderator at: 1/15/2011 11:01 AM new subject after splitting
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1/18/2011 10:14 AM	Rate (0)
Denilson Pegaia Platinum Member Joined: 9/23/2005 Last visit: 3/14/2025 Posts: 4406 Rating: (1475)	Hi, the variable DATA_ADDR specifies the starting address of the data to be accessed in the Modbus slave. This value vary from application to application, because, each programmer places your data in differents address, in accordance with his user program. The first step is to know where stay this data in the slave device. After that, we can choosea correspondent DATA_ADDRvalue.
	Denilson Pegaia Siemens Industry Sector Technical Support
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1/18/2011 12:16 PM	Rate (0)
Homeroid_BL Posts: 211 Rating: (6)	Hello, Pegaia! My question is splitted by Moderator, so you was not able to quite understand it. I want to read following data (MAG 6000 transmitter for MAG5100W), using MB_MASTER instruction of S7-1200 (attached). Which modbus address and data lenght should I use in FB? Best regards and thanks! Attachment Modbus 6000.jpg (743 Downloads)
Homeroid_BL Posts: 211 Rating: (6)	Last edited by: Homeroid_BL at: 1/18/2011 12:17 PM
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1/18/2011 4:09 PM	Rate (0)
Denilson Pegaia Platinum Member Joined: 9/23/2005 Last visit: 3/14/2025 Posts: 4406 Rating: (1475)	Hi, that's make me always confuse too. Looking just for the first variable, "Absolute Volumeflow", I think that you use Mode 0, DATA_ADDR = 403003 and LEN=2. Tell us if it works. Suggestion, try before with a Modbus simulator, to check the telegrams flow.
	Denilson Pegaia Siemens Industry Sector Technical Support
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