| 摘要 |
PURPOSE:To form easily a desired redundant system structure for a process input/output system, by providing an auxiliary bus in a back board connecting plural modules and connecting or disconnecting adjacent modules by this bus. CONSTITUTION:A master module 1 as a multiprocess controlling part and slave modules 2 as plural process input/output parts are connected by a data but 6, and external connection terminals 3 and 4 are connected to modules 1 and 2 respectively by external connection line 8. Multiconnectors 10 are attached to a back board as a connection part of the casing to which modules 1 and 2 are inserted, and an auxiliary bus 7 is wired to connectors 10, and modules 1 and 2 inserted connectors 10 are connected to each other through a contact 100 by this bus 7. Adjacent modules 1 and 2 are connected or disconnected by a short-circuit piece 700 inserted to a contact 70 of a connector 71, and thus, a desired redundant system structure is formed for the process input/output system. |
