207321 / 941160310190
2018-04-16·BA00·III·en·04
Accessories and Spare Parts
31
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Zone 2 Ex i Field Device Coupler 8 Spurs
Series 9411/24
Glossary
EOL resistor (terminator)
Both ends of the trunk are connected to an EOL resistor (100 Ω + 1 mF).
DP/PA coupler
The DP/PA coupler connects a Profibus PA segment to a Profibus DP.
The fieldbus power supply is integrated in the DP/PA coupler.
Fieldbus power supply
The fieldbus power supply transmits DC power to field devices in the fieldbus and causes
impedance matching between the fieldbus and the main power. From an electrical point
of view, the host behaves the same as a field device.
Field device
Field devices are often supplied by the fieldbus, however, they can also have their own
power supply (4-wire device).
Host
The host (provider, moderator) is the “brain“ of the fieldbus topology. The host is
generally a process control system, a programmable logic controller (PLC) or a PC.
Master
The Profibus master is generally a process control system (PCS), a programmable logic
controller (PLC) or a PC.
Segment
A segment in this context refers to the entire unit consisting of trunk, EOL resistors and
all spurs.
Spur
A spur connects the trunk with the field devices. Spurs can be further subdivided into
additional branches.
Trunk
The trunk is the main line when describing fieldbus topology.
Summary of Contents for 9411/24 Series
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