2/2/2013 11:23 PM | |
Joined: 9/27/2006 Last visit: 5/21/2024 Posts: 12257 Rating: (2668)
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Hello Nelson; The easiest way to do something like this is to leave everything as it is and add extra modules (no matter what kind) after the CP. However, you already have 7 IO and CPmodules on your main rack (if you look at your hardware configuration, you will see your first module is located in slot 4). In S7-300 addressing, slot #1 is reserved for the power supply, slot #2 is for the CPU, and slot #3 is for an eventual interface module, which we will be discussing soon. So in your configuration slots 4 to 10 are occupied, slot # 10 is used by your CP. You can only add 1 more module to this rack. Do the exercise in HWConfig, and try to add more than one module to the rack, you'll see what I mean. If you really need to add more IO points for your project, you have a few choices: - you can see if using 64-point or 32-point digital IO modules (replacing existing digital modules)could gain you enough space in your single rack so you do not have to go to a remote rack. Study the digital IO modules chapter in the following manual (notice the difference in terminal modules, the larger number of IO connexions require a 40-pin terminal module instead of the 20-pin modlues you use now): SIMATIC S7-300 S7-300 Automation System Module Data Of course you will have to use the "rewire" in HWConfig so the existing program is linked to the new addresses for your inputs and outputs. -you couldalso add another rack using either a single IM 356 module (already built with 2 interface modules and connected by a 1m cable, so this is only for placement inside the main PLC cabinet). For longer distances, you must use an IM 160/IM 161 pair. The above-mentionned manual has a chapter on interface modules that explains what you would need, and how to build up the system. -you could use Profibus-DP distributed IO, that is a S7-300 rack with power supply and IO modules, but with an IM-153-1 or IM 153-2 slave module for Profibus exchanges between the CPU and the distributed IOs. This manual describes the hardware available from Siemens for Profibus networks: SIMATIC NET PROFIBUS Networks By the way, as an exercise you can build up all 3 different configurations using HWConfig. Thios would tell you how much change you would need in your application in terms of modules, interface modules or distributed modules. Hope this helps, Daniel Chartier |
Last edited by: dchartier at: 2/2/2013 11:46 PM |
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2/3/2013 3:58 AM | |
Joined: 7/15/2007 Last visit: 5/19/2024 Posts: 54 Rating: (0) |
ok.Thank you Daniel. |
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