System description
3433_en_C PHOENIX CONTACT 7/46
2.2 GW PL HART...-BUS expansion modules
The GW PL HART...-BUS expansion modules allow the system to function as a HART to
Ethernet gateway, an up-to-date option that replaces the widely used RS-485 HART
multiplexer solutions. The GW PL HART4-BUS and GW PL HART4-R-BUS are equipped
with four channels, while the GW PL HART8-BUS and GW PL HART8-R-BUS have eight
channels. Up to five expansion modules can be connected to the head station, allowing a
maximum of 40 HART channels to be operated in parallel.
The GW PL HART…-R-BUS provides internal loop resistance of 250 for applications
using a 4 to 20 mA HART isolator or loops with low-loop resistance.
Each channel provides galvanic isolation from the HART signal. With the GW PL
ETH/…BUS CommDTM, the modules can be integrated into an FDT Frame application.
With HART IP protocol, access from the popular HCF OPC server is possible as well.
Common HART parameters can also be accessed using the Modbus TCP or PROFINET
protocol.
Figure 2-3 GW PL HART4-BUS/GW PL HART4-R-BUS structure
S1
H+1
S1
H-1
S2
H+2
S2
H-2
GW PL HART4 -BU S
S
SS
S
S
S
S
S
H+ H-
H+
H-
H+ H-
H+ H-
CH1
CH2
CH3 CH4
1111
2
2
2
2
3
33
3
4
4
4
4
2
5
6
3
4
1
Table 2-2 GW PL HART4-BUS/GW PL HART4-R-
BUS structure
Item Function
1 Channel 1 connector
2 Channel 2 connector
3 Channel 3 connector
4 Channel 4 connector
5 Status LEDs (one per channel)
6 BUS connector
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