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Modbus function code 3 Holding Registers

10/10/2014 2:28 PM	Rate (0)
MicroMan Platinum Member Joined: 11/29/2011 Last visit: 2/4/2025 Posts: 1362 Rating: (233)	HI, I am a bit confused about starting address of the holding registers in MODBUS RTU. I found a reference (Link Below) it says 40001, but I have an IO schedule says it starts from 40000. https://www.automation.siemens.com/tf/WW/en/Posts/66876 Should I correct my IO schedule to start with 40001 or not? Best Regards:
	- What you read here, please check with manuals and your requirements. - Do not forget to Test, Test and Test... - If the post is helpful, please RATE it! MicroMan
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10/10/2014 6:04 PM	Rate (1)
smiffy Platinum Expert Joined: 1/17/2007 Last visit: 3/10/2025 Posts: 1557 Rating: (540)	Holding registers most certainly start from address 40001.
	Programming today is the race between software engineers building bigger and better idiot proof programs, and the universe producing bigger and better idiots. So far, the universe is winning...
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This contribution was helpful to 1 thankful Users MicroMan

10/12/2014 11:54 AM	Rate (1)
zahra hatampour Posts: 15 Rating: (3)	Dear MicroMan There is a difference between starting address in remote device and PDU start address which is really confusing . the startig address in PDU is one number less than starting address in remote device, I bring an example of "MODBUS APPLICATION PROTOCOL SPECIFICATION V1.1b3 " which is downloadable from www.modbus.org . I highly recommend you to study this document. it is only 50 pages. Attachment starting address.pdf (316 Downloads)
zahra hatampour Posts: 15 Rating: (3)
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This contribution was helpful to 1 thankful Users MicroMan

10/12/2014 10:08 PM	Rate (0)
MicroMan Platinum Member Joined: 11/29/2011 Last visit: 2/4/2025 Posts: 1362 Rating: (233)	Hi, Thank you for your answers both. Have a read though. Cheers:
	- What you read here, please check with manuals and your requirements. - Do not forget to Test, Test and Test... - If the post is helpful, please RATE it! MicroMan
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4/14/2015 1:33 PM	Rate (0)
Min_Moderator Platinum Member Joined: 9/3/2014 Last visit: 3/13/2019 Posts: 4766 Rating: (122)	New question published by Bocaje is split to a separate thread with the subject Receiving datas and saving in array. Best regards Min_Moderator
	Last edited by: Min_Moderator at: 4/14/2015 1:35:43 PM
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5/28/2015 1:49 PM	Rate (0)
Min_Moderator Platinum Member Joined: 9/3/2014 Last visit: 3/13/2019 Posts: 4766 Rating: (122)	New question published by nurmohammad is split to a separate thread with the subject Connect S200 and WinCC flexible. Best regards Min_Moderator

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