Chapter 2 Devices 11. The flags related to the memory card SM450~SM453, and SR453 The memory card is used to backup the data in the PLC. The corresponding functions of these special auxiliary relays and the corresponding function of SR453 are as follows. 12. The flags related to the I/ ○ module SR655~SR730 record the mapping error occurring in the module table or the error occurring in the I/ ○ module. SR655~SR730 record the mapping error occurring in the module table. If the mapping error occurs in the module table, the corresponding bit in the special data register belonging to this module will be ON.
Users can read the value in the special data register to get the information about the position where the error occurs. For example, when bit 5 in SR655 is ON, users can get the information that the error occurs at slot 5 in backplane 1. 2-91 Device Function SM450 Whether the memory card exists ON: The memory card exists. OFF: The memory card does not exist. SM451 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 in the memory card is being accessed. ON: The data in the memory card is being accessed. OFF: The data in the memory card is not accessed.
SM453 An error occurs during the operation of the memory card. ON: An error occurs. SR453 If an error occurs during the operation of the memory card, the error code will be recorded.
Main Extension backplane backplane Description Backplane Backplane Backplane Backplane Backplane Backplane Backplane Backplane 1 2 3 4 5 6 7 8 Device SR655 SR656 SR657 SR658 SR659 SR660 SR661 SR662 Bit0 Bit0 Bit0 Bit0 Bit0 Bit0 Bit0 Bit0 Slot 0 Bit1 Bit1 Bit1 Bit1 Bit1 Bit1 Bit1 Bit1 Slot 1 Bit2 Bit2 Bit2 Bit2 Bit2 Bit2 Bit2 Bit2 Slot 2 Bit3 Bit3 Bit3 Bit3 Bit3 Bit3 Bit3 Bit3 Slot 3 Bit4 Bit4 Bit4 Bit4 Bit4 Bit4 Bit4 Bit4 Slot 4 Bit5 Bit5 Bit5 Bit5 Bit5 Bit5 Bit5 Bit5 Slot 5 Bit6 Bit6 Bit6 Bit6 Bit6 Bit6 Bit6 Bit6 Slot 6 Bit7 Bit7 Bit7 Bit7 Bit7 Bit7 Bit7 Bit7 Slot 7 Bit8 - - - - - - - Slot 8 Bit9 - - - - - - - Slot 9 Bit10 - - - - - - - Slot 10 Bit11 - - - - - - - Slot 11