Controller area network (CAN) communication system and error information recording device

A controller area network (CAN) communication system comprising:

• a plurality of communication devices connected to each other via a common communication line and performing communication in accordance with a CAN protocol, the CAN communication system further comprising:
• an error information recording device having:
• an error determination part connected to the communication line and determining whether or not an error is included in a message transmitted by at least one of the plurality of communication devices;
• an error information recording part recording, if the error determination part determines that an error is included in the message, an information concerning the error of the message, wherein the information includes one piece of information selected from the group consisting of a type of an error, a time the error occurred, a frequency of an error and a position of an error in the message;
• an error processing details storage part storing a detail of error processing performed if the error determination part determines that an error is included in a message, wherein the detail is how error processing is performed for each piece of identification information attached to a message;
• and
• an error processing part performing error processing based on the detail stored in the error processing details storage part;
• and
• wherein the error processing details storage part stores a condition for performing error processing, wherein the condition includes a predetermined frequency of detected errors and an identification of a related message, and the error processing part is configured to perform error processing if the error determination part determines that an error is included in a message and a condition stored in the error processing details storage part is satisfied.