Using S7300 313C CPU plus IM365 extended a frame of.313C comes with its own 24DI16DO and 5AI/2AO analog input and output, see the manual configuration above CPU can be placed behind the 8 modules, would like to ask, CPU integrated I/O surface to exclude? No matter what CPU can be placed back 8 modules (on the right side of the CPU manual shall be installed more than eight modules (SM, FM, CP). The cumulative power consumption of the modules installed on the rack must not exceed 1.2 A on the S7-300 back board bus. The cumulative power consumption) do not know what is, refers to the frame all 5V power consumption? Do not know whether it can be understood that digital input can not find 5V power consumption, only the digital output and analog input and output can be found in the 5V power consumption value, using the IM365 extended time frame 1 only received signal accumulation; current load limit
For 1.2 A, in which the maximum current of rack 0.8 is 1 A, it can be understood that the rack 0 is 1.2A, the frame 1 is the maximum can only 0.8A to calculate is it?
Best answer
1, how many modules can be installed on the rack problem?
The CPU rack is called the main frame, when the I/O module on the main frame (up to 8) of the control points is not enough, can add 1-3 expansion rack, each expansion rack can be installed up to 8 I/O modules, 3 extension rack up to install 24 I/O module.
2, the S7-300 on the back board bus shall not exceed 1.2 A problem?
The bus current of the host frame board is provided by the CPU module, so that the CPU can find the next module. The extended frame back board bus current is provided by the extended frame interface module (IM). Note that 5V is not a power supply module with the power module, look to know, there is no U type bus connector, from the CPU module and the expansion rack interface module (IM) is U type bus backplane connector.
The function of the U bus connector of the S7-300 back board and the transmission of the 5V power supply, and the other function of the bus connector is the communication bus.
Generally do not need to take into account the cumulative current load for the 5VDC, because the sum of the 8 I/O modules will not exceed 1.2 A or 0.8 A.
In other words, the right side of the CPU module and the control module (IM) can be installed up to 8 I/O modules, that is, the CPU module and the control interface module (IM) have the capability of providing the maximum load of 5V power supply.
3, about 1.2 A or 0.8 A?
The CPU module and the extended rack interface module (IM) provide 5V power with 1.2 A or 0.8 A, respectively.
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