| 摘要 |
PURPOSE:To give the compulsive operation instruction signal to the data bus and data control section in operation disable state, to check the propriety of other operation in operation disable state, without giving any hindrance to one function under operation. CONSTITUTION:The unit 1 to n having normal use I/O section 10A and spare I/O section 10B as the data bus interface section (hereinafter I/O section) 10 are connected to the normal use bus 20A and spare bus 20B. The test for the said spare units is conducted when the operation of the spare units is inhibited with the selection signal line 30. When compulsive operation instruction signal is made on the signal line 40B at the I/O 10B of the unit 1, the I/O 10B for all the units is separated from the processing section S. After that, the check data CD is fed from the unit 1 to the bus 20B. The I/O section 10B of the unit 1 can check the bus and other units with the response condition from other units to the said data. |
