| 摘要 |
PROBLEM TO BE SOLVED: To provide a field bus system in which a system using an existing analog signal can be gradually moved through stages to a field bus system without operating any special writing or the like. SOLUTION: In a field bus system, field equipments which can be connected with transmission paths 5, 5a, 5b, and 5c are plural analog signal type field equipments 1a, 1b, and 1c to which communication signals including analog signals are inputted and outputted. This system is provided with a processing means for operating mutual conversion between the communication signals inputted and outputted by those analog signal type field equipments 1a, 1b, and 1c and communication signals used on the transmission paths 5, 5a, 5b, and 5c, and for obtaining a power for operating the connected plural analog signal type field equipments 1a, 1b, and 1c from an outside power source 4 through the transmission paths 5, 5a, 5b, and 5c. Thus, an operating power can be obtained from the transmission paths 5, 5a, 5b, and 5c, and any special wiring or the like can not be necessitated even in an equipment which is not corresponding to a field bus. |
