Chapter 9 Troubleshooting 9_ 9-23 Error code Description CPU Status LED indicator status ERROR BUS FAULT 16#6212 There is no response from the remote device after the timeout period. Continue Keep Keep 16#6213 The data received exceeds the limit. Continue Keep Keep 16#6214 The remote device refuses the connection. Continue Keep Keep 16#6400 The number of TCP connections reaches the upper limit, or the flag which is related to the sending of the data is not set to ON. Continue Keep Keep 16#6401 The remote device aborts the connection. Continue Keep Keep 16#6402 There is no response from the remote device after the timeout period.
Continue Keep Keep 16#6403 The remote IP address used in the applied instruction is illegal. Continue Keep Keep 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#6501 The remote device involved in the data exchange does not respond after the timeout period. (SM828~SM955) Continue OFF OFF 16#6502 The remote device involved in the data exchange does not respond correctly.
(SM828~SM955) Continue OFF OFF 16#6700 MODBUS TCP data exchange initialization error Continue Keep Keep 16#6701 MODBUS TCP data exchange timeout Continue Keep Keep 16#6702 MODBUS TCP data receiving error Continue Keep Keep 16#7002 This function is not available for CPU modules. Continue Keep Keep 16#7203 Invalid access code Continue Keep Keep 16#7401 Function code error Continue Keep Keep 16#7402 The packet exceeds the max. data length. Continue Keep Keep 16#7407 Non-ASCII characters exist in the command. Continue Keep Keep 16#7408 PLC is in RUN mode Continue Keep Keep 16#740A The CPU memory is being written or failed to be written.
Continue Keep Keep 16#740B The Clear or Reset operation is in progress. 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 Error occurs when the memory is being cleared. Continue Keep Keep 16#740F Communication timeout Continue Keep Keep 16#7410 The function code for responding the instruction is inconsistent. Continue Keep Keep 16#7412 Data cannot be downloaded to CPU becaue SW1 is ON. Continue Keep Keep 16#757D The number of times users can enter the PLC password is 0. Continue Keep Keep