| 摘要 |
PROBLEM TO BE SOLVED: To surely detect a communication error state, and to resolve the communication error state when it is ensured that a device is not in an error state.SOLUTION: When a communication error determination part detects a communication error, a count value is changed in one of up and down directions. When the communication error determination part detects communication normality, the count value is changed in the other of the up and down directions. When the count value becomes a first threshold, a communication error state is output, and when the count value becomes a second threshold different from the first threshold, the communication error state is resolved. |
