| 摘要 |
<p>A petrochemical process control system having a hub network for connecting a plurality of remotely located devices including sensors and actuators in the field to a control room computer. The power for operating the remote device is brought directly to the devices and not sent over a trunk cable from the control room computer. A redundant spur cable connects the control room computer to said hub. All of the spur cables between the hub and the field devices have current limiting resistors which prevent a failure or shorting of a device or spur cable devices from affecting continued operation of the other devices.</p> |
