|
|
|
 |
Field Box 1
|
The number of outdoor boxes in a sensor system is not limited to two. Regardless of the number of sensors serviced by a box the kind of components installed will be essentially the same. There is only one exception: The box which is directly connected to the indoor control cabinet needs to be equipped differently. In the present example Box 1 takes this role.
The upper drawing shows a block diagram. There is first of all the counterpart of the fiber-optic converter in the control cabinet terminating the long-distance fiber connection. It is connected to a standard INTERBUS bus coupler (bus slave) which is again placed on a local bus. Next in line on this local bus is a fiber-optic INTERBUS branch terminal which does the same as the standard branch terminal in the control cabinet, just via optical PCS fibers instead of copper wires. This terminal establishes the on-site section of the sensor system bus. If there is no additional box it can be omitted. The next components on the local bus are the required number of digital I/O terminals. Each one of them has an inverse counterpart in the control cabinet.
The power supply section does not differ from that in the control cabinet. The drawing below shows the dimensions of the whole assembly along with an MD-220 opto-electronic interface for comparison. These interfaces which establish the link between the fiber-optic sensor strips and the sensor system bus are addressed here.
 |
|
|
|
|
|
|
|
