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| 1/30/2008 3:10 PM | |
Joined: 9/27/2006 Last visit: 11/12/2024 Posts: 12293 Rating:
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Hello farra; When replacing a CPU with another, you always have to check whether the new module is compatible with the old one. Even same numbered modules have different revision levels that can lead to certain problems. So you should first check the compatibility information available on the Siemens Support site, for example here: CPUs compatibility:http://support.automation.siemens.com/WW/view/en/25208203 Yous should also check whether the new CPU is included in your present version of Step 7; sometimes there are hardwareupgrades that you can get from the same Support site that allow you to introduce newer modules in the HWConfig editor, but sometimes that might requirea newer version (read: you have to buy a new license)of your programming software. You should also look at the type of memory card inserted in the present CPU; ROM or RAM? A ROM card might allow you to startup the new CPU directly, if the CPU versions are very close and if you have selected to allow the CPU to "Startup even in case of hardware mismatch" (in the offline CPU propertied, HWConfig editor. A RAM card of course will be erased of course when power is removed from the CPU. A detail that might help, if you want to re-insert the old CPU (in case of problems with the newer one, I always like to keep a back door open): the battery for the CPU's internal memory is located in the power supply; if it is still good, it will support the CPU memory even after power-down; but when you remove the CPU from the rack you will lose everything stored there. You will find in the S7-400 CPU hardware manual a detailed description of an external power connection (up to 24 V DC) that you can plug into the CPU to support the internal RAM circuits; I used a 9 volt battery connected to an audio jack I bought at Radio Shack, it gave me way enough current to plug-out and plug-in CPUs that I needed to test, and didn't use up space.. One trick I liked to use when replacing a S7-400 CPU when a CP443-1was inserted in the rack is explained in the following FAQ: retaining the CP’s configuration data on the CP itself before swapping CPUs allows you to download the modified program to the new CPU through the Ethernet connection instead of having to connect through MPI (I’m lazy that way sometimes): http://support.automation.siemens.com/WW/view/en/1972934That's all I can think of at this time, hope I am not leaving to much to chance. This is mostly from memory, make sure you check the suggested links above (and search for your own on the Support site) before you proceed. Hope this helps, Daniel Chartier |
Last edited by: dchartier at: 30.01.2008 15:12 |
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| 2/2/2008 10:33 AM | |
Joined: 10/11/2006 Last visit: 11/5/2024 Posts: 96 Rating:
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Dear Daniel , Thank you very much for this help. Just one point: farra |
| 1/25/2017 4:37 AM | |
Joined: 11/23/2015 Last visit: 9/22/2024 Posts: 14 Rating:
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Dear Daniel, Can i change online CPU 6ES7 414-4HM14-0AB0? Thanks! |
| 12/14/2017 8:27 AM | |
Joined: 6/19/2017 Last visit: 9/6/2024 Posts: 8175 Rating:
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New question published by alireza jafari is split to a separate thread with the subject What is the replacement CPU for 6es7 414-4hm14-0ab0?. Best regards |
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