F380J106MMA original authentic, spot stock brand NICHICON
Electronic scale crystal oscillator 3.2*2.5mm 3225 16M (16.000MHZ) 12PF 10PPM 20PPM 30PPM
Memory chip

First of all, it is necessary to understand the storage area of ​​Siemens S7-400plc, which includes three basic storage areas (system storage area, load storage area and working storage area). The FEPROM card (flash EPROM card) is used to expand the load memory of the CPU. It is an external memory, and its more important role is as a backup of the program.
The bit memory (M) of the CPU416 is 16KB, and the total I/O address area is 16KB, so there is no problem for the I/O points of 1800. The reason why the memory usage is high is related to your program structure. Generally, you are selecting S7. -400 is mainly based on your block usage to determine the load memory (LoadMemory) and system memory (SystemMemory), and then select the size of the external load memory card (FEPROM card or RAM card) required, and rarely Considering the number of I/O points and the memory of the S7400, 16 KB of bit memory and 16 KB of I/O points are sufficient. Examples are as follows:
First open the program, expand to "Blocks" (block); right click and select "ObjectProperties" (object properties), in the dialog box that appears, select the sub-item "Blocks" (block)
Userprogrammemory: SizeinloadmemoryXXbytes (user program size)
Sizedatamemory: SizeinloadmemoryXXbytes (storage area for storing operational data)
Adding the above two items is to select the size of your external load memory "such as load storage size: 52334" to indicate the size of the user program; "working storage size (sum): 40804" means that the program needs at least 40804 bytes when running. RAM working memory size; "load storage size: 6498" indicates the storage capacity for storing operational data; you can determine the memory card selection by adding the load storage size: 52334 plus the load storage size in the system data memory: 52334 + 6498 = 58832 Bytes. Size, you must select at least 64KB of memory card RAM or flash card FEPROM.

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