When plc performs input/output processing, analog quantity control, and position control, many data registers are required to store data and parameters. The data register is 16 bits and the most significant bit is the sign bit. Two data registers can be used to store 32-bit data, with the most significant bit still being a sign bit. There are several types of data registers: 1. The general purpose data registers (D0 to D199) have a total of 200 points. When M8033 is ON, D0～D199 have power-off protection function; when M8033 is OFF, they have no power-off protection. In this case, when the PLC is RUN → STOP or power failure, the data is all cleared. 2. The power-off data register (D200～D7999) has a total of 7800 points, of which D200～D511 (12 points in total) has the power-off hold function, which can change the general-purpose data register and the power-off hold function data by using the parameter settings of the external device. Register allocation; D490 ~ D509 for communication; D512 ~ D7999 power off function can not be changed by software, but they can be used to clear their contents. According to the parameter setting, D1000 or above can be used as a file register. 3. The special data registers (D8000 ~ D8255) have a total of 256 points. The purpose of the special data register is to monitor the operating state of the PLC. Such as scan time, battery voltage, etc. Undefined special data registers that the user cannot use. See the user manual for details. 4. Index Register (V/Z) The Mitsubishi FX2N series PLC has 16 index registers of V0 to V7 and Z0 to Z7, which are 16-bit registers. The index register V/Z is actually a special purpose data register, which is equivalent to the index register change in the microcomputer, and is used to change the component number (index). For example, when V0=5, D20V0 is executed. The number being executed is D25 (D20+5). The index register can be read and written like other data registers. When 32-bit operation is required, V and Z can be used in series (Z is low and V is high).
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