AH500 Programming Manual S 1 : The value in the file which is read is indicated by the value in S 1 . S 3 : The length of the data which is read from the file The devices in which the data is stored can not exceed the device range. If the value in S 3 is larger than the number of values in the file, the length of the data read from the file is the number of values in the file. The unit S 3 is the double word. D : The initial device in which the data is stored. 2. The related flags: 3. The related error codes (SR453): 4. If the format of the file into which the data is written is 0, the format of the file from which the data is read is 0.
Otherwise, the data can not be read, and SM453 is ON. The same applies to the other file formats. Example: SM450 is ON when the memory card is inserted into the CPU module; SM452 is ON when MREAD is executed; SM452 is OFF when the execution of MREAD is complete. 6-534 Item Description Value unit If the file format is 0, 1, 3, or 5, the unit of the value is the word. If the file format is 2, 4, or 6, the unit of the value is the double word. Parameter unit The parameter unit is the double word. Usage The value in S should indicate the value in the file. 1 If the value in S is 0, the first value in the file is read.
1 Flag Description SM450 If the memory card is in the CPU module, the flag is ON. SM451 The write protection switch on the memory card ON: The memory card is write protected. OFF: The memory card is not write protected. SM452 The data is being written from the PLC to the memory card, or the data is being read from the memory card into the PLC. SM453 If an error occurs during the operation of the memory card, the flag is ON. If the flag is ON, users have to reset it to OFF. The error code is stored in SR453. Error code Description 16#005E An error occurs when the memory card is initialized. 16#005F The path is incorrect, or the file does not exist.
16#0060 The default folder can not be created. 16#0061 The memory space is insufficient. 16#0062 The memory card is write protected. 16#0063 An error occurs when the data is written into the file. 16#0064 The data can not be read from the memory card.