2/28/2013 10:44 AM | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Joined: 9/23/2005 Last visit: 9/10/2024 Posts: 4347 Rating:
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Hi, A consequence of this strategy is that the modules should receive two power supplies: one for the “field” electronic and other for the “backplane” circuit. Generally (for the other PLC families), the internal circuits are supplied by the CPU, and it means that the CPU power limitation lead to limitations to number / type of modules that could be used together with the CPU. The S7-1500 family innovate this concept permitting that the internal supply could be “buster” by external power supply. As consequence of this innovation, the S7-1500 has two types of power supplies: Load (Module) power supply (PM) The load power supply feeds the input and output circuits of the modules and the sensors and actuators. You also need a load power supply, if necessary to provide the CPU and the system power supply with the required 24 V DC. The PM is connected to module terminals connector. System power supply (PS) The system power supply delivers only the required system voltage for the internal backplane. This system voltage supplied parts of the module electronics and LEDs that indicate the module status (RUN, ERROR, MAINT). TIPS: It is possible to connect one PS on left or in right side of the CPU (optional). When used on the left side of the CPU, the PS supply the CPU and the modules on right side of them (the CPU doesn’t supply any module, and takes also the power from PS). When used on the right side of the CPU, the PS start a “new” power circuit, independently of the CPU supply. It is possible to use up two PS between modules, on the right side of the CPU. If the PS is not connected, not ON, or if the real configuration differ so much of the projected, the CPU could not be able to supply all modules. In this case, the CPU turn off all bus, register the event on diagnostic buffer and tries to start again (STOP LED flashes). STEP7 checks if the configuration is consistent (Device View, CPU/PS properties) As Tomb Rule, a CPU could supply at least 10W of power, and an IO module takes at maximal, 1.15W (CP,CM takes more). That means that you can use up to 8 modules without to check if an additional PS is necessary. The follows tables shows the power supply capacity in the three situations: CPU stand alone, with PS on left side of the CPU and with PS in a new circuit (on right side of the CPU) Option 1: CPU standalone
Option 2: System Power Suppy on left side of the CPU
System Power Suppy on right side of the CPU
References: Additional information about system power supplies and load power supplies is available in the manual "SIMATIC S7-1500 Automation System" in Entry ID: 59191792and in FAQ "How should you configure the system power supplies for the S7-1500 in STEP 7 (TIA Portal) so that all the connected modules are supplied?" (http://support.automation.siemens.com/WW/view/en/73191930?Datakey=47071380). |
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Last edited by: Pegaia at: 5/23/2013 12:32 PMLast edited by: Pegaia at: 5/23/2013 12:28 PMlink of FAQ Last edited by: Pegaia at: 3/1/2013 11:29 AMDenilson Pegaia |
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This contribution was helpful to
21 thankful Users |
5/4/2016 4:46 AM | |
Posts: 4 Rating:
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Ok .. Got it Sir .. Thanks Very much .. |
10/25/2016 4:29 PM | |
Joined: 9/3/2014 Last visit: 3/13/2019 Posts: 4767 Rating:
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New question published by Karimat is split to a separate thread with the subject Power Supply setup. Best regards |
3/1/2017 10:46 AM | |
Joined: 3/2/2007 Last visit: 9/10/2024 Posts: 935 Rating:
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very useful information. thank you |
... thank you ... |
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3/16/2017 11:24 AM | |
Joined: 9/23/2005 Last visit: 9/10/2024 Posts: 4347 Rating:
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it is a pleasure to help :) |
Denilson Pegaia |
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