GE 350-E-P0-G0-HEENN-SN-NN On site interface module
Memory capacity refers to the size of hardware storage units that can be provided by the programmable controller itself. The program capacity of 350-E-P5-G5-HESNN-SN-DN is the size of storage units used by user applications in memory. Therefore, the program capacity of 350-E-P5-G5-HESNN-SN-DN is smaller than the memory capacity. In the planning phase, as the user application program has not yet been developed, the program capacity of 350-E-P5-G5-HESNN-SN-DN is unknown during the planning phase and needs to be determined after program debugging. In order to have a certain budget for program capacity when planning and selecting, the budget for memory capacity is usually chosen as a substitute.
There is no fixed formula for the budget of memory capacity. Many literature sources in 350-E-P5-G5-HESNN-SN-DN provide different formulas, which are generally 10-15 times the number of digital I/O points, plus 100 times the number of imitation I/O points. 350-E-P5-G5-HESNN-SN-DN uses this number as the total word count of memory (16 bits per word), and also considers the margin based on 25% of this number.
Special attention should also be paid to the following points in input wiring:
(1) The input wiring should generally not exceed 30m. But if the environmental interference is small and the voltage drop is not significant, the input wiring can be appropriately longer.
(2) The input and output lines cannot use the same cable, and the input and output lines should be separated.
(3) The width of the pulse signal that the programmable controller can accept should be greater than the time of the scanning cycle.
Output wiring:
(1) Programmable controllers come in three forms: relay output, thyristor output, and transistor output.
(2) The output terminal wiring is divided into independent output and common output. When the output relay or thyristor of the PLC is activated, two output terminals of the same number are connected. Different types and voltage levels of output voltage can be used in different groups. But the outputs in the same group can only use the same type and voltage level of power supply.
(3) Due to the output components of PLC being encapsulated on the printed circuit board and connected to the terminal board, if the load connecting the output components is short circuited, it will burn out the printed circuit board. Therefore, fuse protection should be applied to the output components.
(4) When using relay output, the size of the inductive load it bears affects the working life of the relay, so the relay requires a long working life.
(5) The output load of PLC may generate noise interference, so measures should be taken to control it.
In addition, for hazardous loads that can cause harm to users, in addition to considering them in the control program, external emergency stop circuits should also be designed to cut off the power supply of the load that causes harm when the programmable controller fails.
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