| 摘要 |
PURPOSE:To secure high reliability by using a simple interface without executing doubling by executing continuously transmission at least two times, and comparing and collating data of the two times portion, when transmitting the data. CONSTITUTION:When a data is transmitted to a PI/O part 2 side from a CPU1 part, an interface part 5 sends the data from the CPU part 1 to the PI/O part 2 two times continuously. The transmitting data pass through a cable 4, are received by an interface part 6 and are compared and collated, and they are outputted to the PI/O part 2 only when the data of the first time and the second time coincide with each other. In case of transmitting a data to the CPU part 1 side from the PI/O part 2, each data of a control end 3 is collected, and the interface 6 sends the data to the CPU part 1 side two times continuously. The interface 5 receives the data and compares and collates them, and transmits the data to the CPU part 1 only when the data of the first time and the second time coincide with each other. |
