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Installation
22
1980
2010
-0
2
21
3.3
Electrical Connection to other Devices
The WirelessHART adapter can be connected to the following device types/configurations:
•
Field device operating in a control loop without communication resistor,
•
Field device operating in a control loop with communication resistor
–
this configuration
is used for HART multidrop with 2, 3 or 4 devices,
•
Two-wire field device operating independently with power supplied by the adapter,
•
Four-wire field device operating independently with power supplied by an external
source.
The devices are connected to the terminal block located inside the adapter housing.
Figure 3.7: Terminal block (1 ... 6) and terminals for HART modem (7 + 8)
Terminal
Function
1
Device supply
2
HART/4 ... 20 mA
3
External Supply/GND
4
HART high impedance
5, 7
HART high impedance
6, 8
High impedance GND