The selection of PLC capacity steps and principles of PLC

PLC controller capacity including the I/O points and user's storage capacity. ( A) The choice of the I/O points of PLC on average the price of the I/O point is relatively high, so should be a reasonable choice of PLC controller I/O point number, strive to use under the premise of meeting the control requirement of I/O point at least, but must have a certain margin. I/O points is usually based on input and output signal of the controlled system of the practical need of, plus 10% ~ 15% margin to determine. ( 2) Storage capacity of the choice of the user program the required storage size is not only related to the function of the PLC controller system, but also with the function realization method, program writing level. An experienced programmer and a beginner, when finish the same complex function, the program may differ by as much as 25%, so for the beginners should stay a margin in the storage capacity estimation. PLC I/O points, on a large program reflects the function of the PLC system, thus can determine on the basis of in the I/O points, press type estimation of storage capacity, adding 20% ~ 30% allowance. Storage capacity ( Bytes) Switch I/O points x = 10 + analog I/O channel number x 100 in addition, the storage capacity of choice at the same time, pay attention to the choice of the type of memory.
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