Fieldbus standards require buses to be terminated at both ends to prevent

signal reflections. In many applications, one terminator is built into the

power conditioner, which is usually located near the control system.

The second terminator is either integrated into the Megablock or fieldbus

barrier wiring component, or added in the form of a separate DIN-rail

mounted unit.

The Crouse-Hinds series MTL range of fieldbus terminators are ideally suited

to provide the terminator that is normally installed in a junction box in the

field (along with a Megablock for interconnecting devices).

A large “T” is placed on all terminator labels for easy identification of the

Terminator location.

Design features

• Terminators are clearly marked with a large ‘T’ making them easy to identify in the field

• Provides some differential and common-mode (cable shield) over voltage protection

• The ground connection on the filedbus terminators are used to shunt any surge currents

that may get on the cable shield to a local ground in the junction box.

Although the normal practice is to ground the cable shield in the control room, this additional

ground connection will not cause ground loops.

• In the event of an overvoltage on the cable shield, a gas discharge tube fires and shunts

this unwanted current to ground