Terminators are used to terminate and provide impedance compensation at a segment end. Two terminators are needed for each segment — one on the DCS/PLC terminal side (beginning of the segment) and the other on its other end.
There are two types of terminators — internal terminators (in relation to a terminating block) and external (fitted on as a separate accessory).
You can create internal or external terminators as required, whether it is a terminal apparatus strip or a plug-and-socket termination block.
You create internal terminators using the configuration tools when creating plug-and-socket boxes or termination blocks. External terminators are added to the termination block (an apparatus or a plug-and-socket box) during the wiring design phase.