PLC programmable controller system RAM memory area

PLC programmable controller system RAM storage area including the I/O image area and all kinds of soft equipment ( For example: logic coil, data registers, timer, counter, index register, accumulator, etc. ) Storage area. ( 一) Image area due to the PLC controller I/O operation, only read in each input in the input sampling stage state and data, the output refresh stage to the output state and data sent to the corresponding peripherals. Therefore, it requires a certain amount of storage unit ( RAM) For storing the state of the I/O and data, the storage unit known as I/O image area. A switch I/O and take up a bit of storage unit ( 位) , an analog I/O takes up a word in the storage unit ( 16 bit) 。 Therefore, the I/O image area can be seen as the switch I/O image area and analog I/O image area of two parts. ( B） System soft equipment storage area in addition to the I/O image area, the system RAM memory area also includes PLC controller internal various soft equipment ( Logic coil, data registers, timers, counters, index register, accumulator, etc. ) The storage area. The storage area is divided into has kept losing electricity storage area and storage area without keep losing electricity, when the former PLC power, by internal lithium electronic power supply. Cause retention of the data in this part of the storage unit; The latter when PLC controller stops running, all data in this part of the storage unit 'zero'.
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