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Question about IM modules

Created by: Pandiani at: 5/23/2007 8:33 AM (8 Replies)

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5/23/2007 8:33 AM	Rate (0)
Pandiani Bronze Member Joined: 10/31/2005 Last visit: 9/4/2024 Posts: 366 Rating: (31)	Hello to all, I want to learn more about IM interface modules. How many modules (analog, digital etc.) can be connected on one rack and how to know when is the timeto use IM module? Also I would like to learn to use correct terminology, so feel free tocorrect me every time possible. Is it correct to say that IM is used to connect two or more racks? Thank you very much.
	Last edited by: Pandiani at: 23.05.2007 10:56
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5/23/2007 10:03 AM	Rate (2)
Wizard Diamond Expert Joined: 4/24/2006 Last visit: 1/24/2025 Posts: 8808 Rating: (1177)	Hello Pandiani, The maximum number of I/O cards on a rack is 8. When you need more than 8 I/O cards, you will have to use an IM. There are two possibility's: IM365: You can only use 1 expanding rack And not all I/O cards are allowed. IM360 and IM361, you can use 3 expanding racks. You need one IM360 in the mean rack and every expanding rack needs an IM361. Best regards, Wizard

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5/23/2007 11:04 AM	Rate (0)
Pandiani Bronze Member Joined: 10/31/2005 Last visit: 9/4/2024 Posts: 366 Rating: (31)	Thank you very much for your explanations Wizard!

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5/23/2007 11:35 AM	Rate (0)
Wizard Diamond Expert Joined: 4/24/2006 Last visit: 1/24/2025 Posts: 8808 Rating: (1177)	Hello Pandiani, You are welcome Here is a link to manual, with information about the IM modules: http://support.automation.siemens.com/WW/view/en/8859629 See chapter 8. Best regards, Wizard

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5/23/2007 4:05 PM	Rate (1)
Mojo Bronze Member Joined: 3/27/2006 Last visit: 10/11/2024 Posts: 90 Rating: (13)	Another reason to use an expansion rack is if one rack will not fit. The S7-300 is not a fixed-width platform like Allen-Bradley or GE Fanuc. Some S7-300 modules take up the physical space of two slots (FM350-2, 32-pt. output modules, etc). So while you may find slots 4-8 are suitable for your I-O needs - check to be sure you have the physical room for the modules you are using.
	"I never let a cowboy make the coffee." Yeah, thats what Granny always said to my Grandad. And he'd say: "Never tell a joke that ain't that funny more than once." "And if you wanna hear God laugh, tell Him your plans." Van Zant "Help Somebody"
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5/23/2007 6:15 PM	Rate (0)
Pandiani Bronze Member Joined: 10/31/2005 Last visit: 9/4/2024 Posts: 366 Rating: (31)	Thanks Mojo, I never really thought about it .

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5/24/2007 12:09 AM	Rate (0)
Late Platinum Expert Joined: 1/7/2006 Last visit: 12/23/2024 Posts: 2705 Rating: (320)	Pandiani I want to learn more about IM interface modules. How many modules (analog, digital etc.) can be connected on one rack and how to know when is the timeto use IM module? Also I would like to learn to use correct terminology, so feel free tocorrect me every time possible. Is it correct to say that IM is used to connect two or more racks? Hi Pandiani, Which IM-modules do you mean, the IM 360/361, the IM 365, the IM 153-1, the IM 153-2, the IM 151-1 Standard, the IM 151-1 HF..... With the IM 360/361 and the IM 365 you may build up more racks (until 3)behind the CPU-rack. Whit the IM 153-1/2 you might built up 125 slaves all with 8 or 12 modules behind it. With the newest ones that will come soon you may use 12 modules behind the IM 153-2BA02, please consider that you may not use more then 244 byte In- and Out-put. There are also on Profinet now the standard modules, they can also have 12 modules behind the IM, there is more dataspace available.
	I hope that the answer will help, if you have still questions, don't hesitate to ask me. All the best, Late Never say never, think in solutions, not in trouble......
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5/24/2007 7:19 AM	Rate (0)
Pandiani Bronze Member Joined: 10/31/2005 Last visit: 9/4/2024 Posts: 366 Rating: (31)	Hello Late, I saw application with three racks and IM 360/361, that's why I asked these questions. I thought at first that numbers of I/O modules is not limited just by length of rack, but features of backplane, otherwise some kind of appendix would be used. Then, I have read that FM module Mojo mentioned tkes up physical space of two modules and now I think that length of the rack is primary reason. I'll download and read chapter Wizard proposed. AlsoI assume that all these informations are valid for S7-400 as well, right? Thanks!

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5/27/2007 10:44 PM	Rate (0)
Late Platinum Expert Joined: 1/7/2006 Last visit: 12/23/2024 Posts: 2705 Rating: (320)	Pandiani I saw application with three racks and IM 360/361, that's why I asked these questions. I thought at first that numbers of I/O modules is not limited just by length of rack, but features of backplane, otherwise some kind of appendix would be used. Then, I have read that FM module Mojo mentioned tkes up physical space of two modules and now I think that length of the rack is primary reason. AlsoI assume that all these informations are valid for S7-400 as well, right? Hello Pandiani, For Profibus the amount of modules could be 8 for the older IM's and for the newer ones it is 12(6ES7153-2BA02-0AB0). The restriction is that you may not have more then 244 byte in- and output... For Profinet the newest modules for ET200M are direct to be used with 12 modules, there is also more length of bytes possible. For the S7-400 it is also that the ET 200M DP or ET 200M PN have the same restrictions as for the S7-300.
	I hope that the answer will help, if you have still questions, don't hesitate to ask me. All the best, Late Never say never, think in solutions, not in trouble......
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