AH500 Programming Manual 7-10 Error code Description CPU Status LED indicator status ERROR BUS FAULT 16#6404 The MODBUS function code not supported is received. Continue Keep Keep 16#6405 The number of data which will be received is not consistent with the actual length of the data. Continue Keep Keep 16#6500 An error occurs when a data exchange function is initialized. (SM699) Continue Blinking OFF 16#6501 A remote device does not respond after a timeout. (SM828-SM955) Continue OFF OFF 16#6502 The packet with which a remote device replies is incorrect. (SM828-SM955) Continue OFF OFF 16#6700 An error occurs when a Modbus TCP data exchange is initialized.
Continue Keep Keep 16#6701 Modbus TCP data exchange timeout Continue Keep Keep 16#6702 The data received by means of a Modbus TCP data exchange is incorrect. Continue Keep Keep 16#7002 The CPU module does not support the function. Continue Keep Keep 16#7203 Invalid access code Continue Keep Keep 16#7401 Function code error Continue Keep Keep 16#7402 The size of a packet exceeds the maximum data length. Continue Keep Keep 16#7404 Packet format error Continue Keep Keep 16#7405 The number of bytes is incorrect. Continue Keep Keep 16#7406 Checksum error Continue Keep Keep 16#7407 There are non-ASCII characters in a command. Continue Keep Keep 16#7408 The PLC is running.
Continue Keep Keep 16#740A Data is being written to the memory in the PLC or data fails to be written to the memory in the PLC. Continue Keep Keep 16#740B The CPU module is being reset, or the values in the laching devices are being cleared. Continue Keep Keep 16#740C The backplane number in a communication command is incorrect. Continue Keep Keep 16#740D The slot number in a communication command is incorrect. Continue Keep Keep 16#740E An error occurs when the the data in the memory in the PLC is cleared. Continue Keep Keep 16#740F Communication timeout Continue Keep Keep 16#7410 The function code in a reply command is incorrect.
Continue Keep Keep 16#7412 Owing to the fact that SW1 is ON, data can not be downloaded to the CPU module. Continue Keep Keep 16#757D The remaining number of PLC password guesses is 0. Continue Keep Keep 16#757E The PLC password entered is incorrect. Continue Keep Keep 16#8105 The program downloaded to the CPU module is incorrect. The syntax downloaded is incorrect. Continue Keep Keep 16#8106 The program downloaded is incorrect. The length of the machine code exceeds the limit. Continue Keep Keep