12/7/2012 10:59 AM | |
Joined: 4/22/2010 Last visit: 5/3/2024 Posts: 5697 Rating: (715) |
Hello, O.k. if they want to use fuses to protect (against what?) The max current off the CPU is 500mA. A CPU with max number of module that is 1500mA You will find it in the S71200 system manual. Regards, Marcjan |
Problem solved? |
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12/7/2012 3:55 PM | |
Joined: 7/7/2010 Last visit: 9/23/2024 Posts: 15216 Rating: (2417)
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If you are fusing the supply TO the PLC for proper branch protection, it depends on what your PLC is doing or will do when fully utilized. If your inputs are being powered from another device other than the PLCs 24V source (which can consume up to 2A of the incoming 24V supply to the plc), the power & current requirements for the plc are much less. It is up to you to select the proper ratings based on the recommendations from Siemens (from the s7-1200 manual), and your own experience and knowledge of how it will be used. For example, let's say Siemens says to use 10A fuse of a certain type or class, but you know your system will worst-case draw no more than 3A, then you could put in 4A or 5A fuse and feel relatively comfortable in being overly protective. You should not put in 15A or 20A if Siemens suggests 10A. These are just examples with unrealistic values to make a point. Hope it is useful. Thanks Marcjanfor posting good advice above. |
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12/10/2012 1:41 PM | |
Joined: 8/16/2010 Last visit: 9/23/2024 Posts: 637 Rating: (12) |
OK...Now it's clear. Thank's, Miloš |
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