| 摘要 |
A bus system for an industrial guard has a rail (10) on which is supported a plurality of modules (11,15) each having at its two ends respectively first and second parts (23,24) of a multi-way connector, whereby one module may be electrically connected to another module already mounted on the rail. Each module (11,15) has a pair of safety conductors (34A,34B)-extending between the connector parts (23,24) and in a safety circuit and a further pair of data conductors (36,37) also extending between the connector parts (23,24) and in a data circuit. A given module (27) may include a switch (30) to break the circuit including the safety conductors, or a component which feeds data to the data conductor or which is controlled by data carried by the data conductor. <IMAGE>
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