1. CPU address setting, generally starting from 3, do not use 1, these are the default values ​​of the system, it is not recommended.
2. Select CP443-5, Attribute, DP-MASTER, and select DP-V1 because it has better processing power than DP-V0.
3. Click on the IO module properties to see the type of signal it supports. We can change the signal type and range of its measurements. The power supply frequency is generally 50HZ (fixed), we will not make changes. The two channels are a group, and the two-wire and four-wire systems should not be placed together. Analog addresses typically start at 512. Open the AO card property, you can set a type of value, this value will be the output result after the CPU is broken, that is, the result will be generated after the CPU is stopped. There are three options, one is that the output has no voltage and current, and the other is to keep The original value, the third is to choose a substitute value.
4. After saving the changes, you can click on the consistency check to see if there are any errors.
5. Select the PG/PC Interface from the option and set the interface.
6. STEP7 programming, FBD, LAD can be converted to STL, but STL may not be converted to FBD and LAD. Because of the strict requirements of its statement. However, the benefit of STL programming is that you can see the order in which the statements are executed.
7. A statement is the smallest unit of a user program and consists of instructions and addresses. Action 1 Action 0 Normally open contact does not work 0 Normally closed contact does not operate 1 Memory Function, Bit Memories, intermediate variable For complex operation, “M†refers to the flag bit with storage function. RLO refers to logical operation results
8. Decimal system, hexadecimal, binary, and data type.
9. The S7-300 has two accumulators and the S7-400 has four accumulators.
10. The scan time includes PII, user program, PIQ, and operating system, which are collectively referred to as cyclic scan time. The minimum response time is a loop. The maximum response time is two cycles. Plc does not recognize very fast signal changes, so the input signal should last for at least one cycle to ensure recognition.
11. Block type and function Organization block OB function block FB (must have a data block) Function FC data block DB The organization block is the interface between the operating system and the user program. The entire program can be saved to OB1 for loop processing. (Linear Programming) A call to a function that provides the ability to pass parameters in a user program. DB: has full data block (the whole program is valid), structured data storage (instant number module) OB1: linear programming, modular programming, structured programming STL programming, "or" in front of "and" plus"("")"
12. The absolute address and the symbol address are in a one-to-one correspondence.
13. Set the trigger point; the function block can insert VAT, change the input and output, the attribute Trigger hardware configuration - IO module - Monitor Modify Trigger can not turn off its forced output when the object is not read or written.
14. In case of failure, save the confidence and then recover
15. Totally Integrated Automation----TIA
16. In the network NETPRO, add the option to the connection, you can achieve two-way communication connection by hooking NO ACTIVE.
16. When project archiving, it is best to turn off the project and then archive it.
17. If you modify the program online, then after the modification, remember to copy the program back.
18. Activate the battery method: short circuit, the time is less than 2 seconds. More PLC knowledge can be referred to.
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