| 摘要 |
PROBLEM TO BE SOLVED: To positively receive a command transmitted from a main control device, by a sub-control device. SOLUTION: A transmitter stores and holds a command set to a transmitting part (an output port) when receiving a service interruption signal and resumes processing using the command held in a transmit command storage part when current application is restored. A receiver stores and holds the command received within a specified period after receiving the service interruption signal, in a receive command storage part at current-off and resumes processing after the recovery of the current application, using the command if there is the command stored in the receive command storage part at current-off.
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