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How many modules can be connected?

Created by: sth at: 3/3/2010 7:43 AM (5 Replies)

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3/3/2010 7:43 AM	Rate (0)
sth Posts: 29 Rating: (1)	Hi, How many expansion modules can be connected to one LOGO!? Is it possible to mixed all the modules, for example toconnect to the LOGO!a DM 24R with an AM2? I have now a LOGO! 12/24RC and on top of the display is written: *I1, I2= AI3, AI4 (0..10V)* *I7, I8= AI1, AI2 (0..10V)* What does it mean?
sth Posts: 29 Rating: (1)	Last edited by: sth at: 3/3/2010 7:43 AM
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3/3/2010 7:49 AM	Rate (0)
umencho Grandmaster Joined: 3/21/2006 Last visit: 10/16/2025 Posts: 10239 Rating: (1183)	Hello, Take a look at Compatibility overview of LOGO! Basic and LOGO! Expansion modules. Best regards, Hristo Mihalev

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3/3/2010 9:36 AM	Rate (2)
LOGO!Barbarian Posts: 173 Rating: (95)	Hi ! You can connect as many modules as you like and make the worlds longest LOGO! configuration..... BUT The software will only support a MAXIMUM of - 24 digital inputs (channels, not modules!) - 16 digital outputs - 8 analog inputs - 2 analog outputs That's it! 1) If you connect the maximum number of digital I/O modules (4 of the DM8 type or 2 of the DM16 type, depending on supply voltage), then the LAST 4 digital outputs cannot be addressed from the software and cannot be used. This is a limitation of the expansion bus data telegram size and synchronisation. CHanging this would make all older expansion modules no longer backwards compatible to the base modules. 2) If you have a LOGO! 24 or LOGO! 12/24RC and you use 2 of the ON-BOARD digital inputs as analog inputs (0..10V), then you cna only add 3 analog input expansion modules (AM2 or AM2 PT100). If you use all 4 on-board analog inputs, then you can only add 2 analog input expansion modules. (Using 2 or 4 is selectable under FILE - Properties - Parameters) 3) If you use the on-baord digital inputs as analog inputs, then you cannot use the input numbers I1, I2, I7 & I8 in your program and you will then have only a maximum number of digital inputs of 20 (4 left over on-board & 16 from 4 x DM8's) 4) If you add an AS-i module or an EIB/KNX module, then there must be at least 4 physical digital inputs and 4 physical digital outputs available (AS-i) and at least some physical digital or analog I/0 left over to be 'virtually' mapped into the KNX network. YOUR OTHER QUESTION The text on the 12/24RC tells you that the digital input I7 can have a 0..10V analog signal wired to it and you can use this as AI1 in the program (but you cannot then use I7). I8 can be used as a 0..10 V AI2 These 2 were the original ones since the 0BA4 on the LOGO! 24, 24o, 12/24RC & 12/24RCo I1 can be used as AI3 I2 can be used as AI4 These are the new AI channels possible on-board since 0BA6 (for the same model types). The strange numbering of these digital/analog inputs is to keep backwards compatibility with older programs and installations. I hope these answers help and support the other diagrams you were refered to. Cheers Aaaaaaarrrrggghhh!
LOGO!Barbarian Posts: 173 Rating: (95)
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This contribution was helpful to 2 thankful Users realpower_ir vanhelsing

3/3/2010 11:05 AM	Rate (0)
sth Posts: 29 Rating: (1)	Thanks a lot Barbarian for your very good explanation. This is more clear now. About the Text Display, I suppose that it can be used in any configuration and it doesn't depend of the number of expansion modules. Is it correct?
sth Posts: 29 Rating: (1)
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3/3/2010 2:03 PM	Rate (0)
LOGO!Barbarian Posts: 173 Rating: (95)	Hi sth! Yup, the TD can be used on any LOGO! base module (BM) / CPU. Even if it is a Pure version (with no on-board LCD). It can be used on the BM alone or a full configuration. Cheers. Aaaaarrrrggghhh!
LOGO!Barbarian Posts: 173 Rating: (95)
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3/3/2010 2:11 PM	Rate (0)
sth Posts: 29 Rating: (1)	Thanks!
sth Posts: 29 Rating: (1)
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