| 摘要 |
<p>PURPOSE:To prevent misoperation of a unit due to incomplete mount or mis- mount by providing an error detection circuit detecting an error of an address data given from a shelf to the unit. CONSTITUTION:An address data in which the number of '0' and the number of '1' are equal to each other is sent from an address setting circuit 5 of a shelf 1. When a channel panel 2 is mounted, the address data is sent to a mount position detection circuit 6 and an error detection circuit 8 via a connector. Then a coincidence circuit comprising an inverting gate 11 and a coincidence gate 12 in the error detection circuit 8 detects an address error pattern and the result of detection is sent to the mount position detection circuit 6 comprising an OR gate 13. When an address error is noticed from the error detection circuit 8, the mount position detection circuit 6 inhibits the operation control corresponding to the address data and an alarm signal representing incomplete mount is generated. Thus, malfunction of the unit is prevented.</p> |
