GE VMIVME-4116 CPU board
GE VMIVME-4116 General Electric Module
GE VMIVME-4116 General Electric Module
GE VMIVME-4116 General Electric Module
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PLC control system parts, DCS system parts, steam turbine card parts, robot system parts, large servo system parts. PLC module, DCS module, CPU module, IO module, DO module, AI module, DI module, network communication module, Ethernet module, motion control module, analog input module, analog output module, digital input module, digital output module, redundancy module, power module, relay output module, relay input module, processor module, etc
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PLC is developed from the principle of relay control. It stores instructions for logic operation, sequence control, timing, counting and calculation; It also controls various machinery or production processes through digital input and output operation. The control program compiled by the user expresses the technological requirements of the production process and is stored in the user program memory of plc in advance. During operation, execute the stored program item by item to complete the operation required by the process flow.
Engineering analysis and comparison of PLC and DCS
There is a program counter in the CPU of the PLC that indicates the storage address of the program step. During the program operation, the counter will automatically add 1 when executing one step. The program will be executed from the start step (step number is zero) to the * * * end step (usually the end instruction), and then return to the start step cycle operation. The time required for plc to complete each cycle operation is called a scanning cycle. For different types of plc, the cycle scanning cycle is between 1 microsecond and tens of microseconds. The cyclic operation of program counter is not available in dcs. This is also the reason why the redundancy of plc is not as good as that of dcs.
DCS is developed on the basis of operational amplifier. Make the relationship between all functions and process variables into function blocks (some DCS systems are called puff blocks). The main difference between the performance of dcs and plc is in the logic calculation of switching value and the calculation of analog value. Even though the two infiltrate each other later, there are still differences.
After the 1980s, in addition to logic calculation, the algorithm function used in the control circuit of PLC has been greatly improved. However, PLC uses ladder diagram to program, and the calculation of analog quantity is not very intuitive in programming, and the programming is more troublesome. However, in terms of solving logic, it shows the advantage of being fast. At the microsecond level, it is less than 1 millisecond to solve 1k logic program. It treats all inputs as switching values, and 16 bits (also 32 bits) are an analog value.
The DCS takes all inputs as analog quantities, and the first position is the switching value. Solve a logic in the order of hundreds of microseconds to a few milliseconds. It takes tens of milliseconds for plc to solve a pid operation, which is comparable to the operation time of dcs.
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