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Data Signal Protection
Protecting Industrial Bus (Data) Signals
TRABTECH
Application Note
2558A
1
Description
Industrial networks, such as Profibus®, Foundation
Fieldbus and RS-485, can be protected with the
PLUGTRAB (PT…-HF…) product series. The PT…-HF…
products feature a unique hybrid circuit with specially
arranged components to minimize circuit capacitance. This
ensures that there will not be any attenuation of the data
signal for even the fastest of bus networks.
The PT…-HF… can be used with systems up to
12 Mbits/sec.
With surge current handling capacity up to 10 kA, vulnerable network interface cards are safely protected. As with
all PLUGTRAB PT products, maintenance and testing are
easy with “hot-swap” plugs. These products are typically
installed inside a control cabinet on a DIN rail (NS 35).
Table 1 provides a guide to assist in selection of the proper
products based on a network’s physical layer.
The wiring diagrams that follow show the most popular bus
network circuits.
© PHOENIX CONTACT - 09/2009
For Ethernet connections using RJ45 connectors, use the following options:
−− D-LAN-CAT.5E (Order No. 2858991) for
Category 5 cable
−− D-LAN-CAT.5E-U (Order No. 2859084) for
Category 5 cable using DIN rail mount
−− D-LAN-CAT.6+ (Order No. 2881007) for
Category 6 cable and PoE
Data Signal Protection
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Product Selection
Product
IN (unprotected)
OUT (protected)
Shield
Earth-ground
RS-232
PT 5-HF-12DC
Txd - 1
Rxd - 7
Txd - 2
Rxd - 4
IN - 9
OUT - 10
IN - 3
OUT - 4
RS-422
PT 5-HF-12DC
Pair 1 - 1 & 5
Pair 2 - 7 & 11
Pair 1 - 2 & 6
Pair 2 - 8 & 12
IN - 9
OUT - 10
IN - 3
OUT - 4
RS-485 (4-wire)
PT 5-HF-12DC
Pair 1 - 1 & 5
Pair 2 - 7 & 11
Pair 1 - 2 & 6
Pair 2 - 8 & 12
IN - 9
OUT - 10
IN - 3
OUT - 4
RS-485 (2-wire)
PT 2X2-HF-12DC
Data Highway
(DH-485)
PT 5-HF-12DC
A-1
B-5
Common - 7
A-2
B-6
Common - 8
IN - 9
OUT - 10
IN - 3
OUT - 4
Data Highway (DH)
Data Highway + (DH+)
PT 5-HF-12DC
Clear wire - 1
Blue wire - 5
Clear wire - 2
Blue wire - 6
IN - 9
OUT - 10
IN - 3
OUT - 4
Remote I/O
PT 5-HF-12DC
Clear wire - 1
Blue wire - 5
Clear wire - 2
Blue wire - 6
IN - 9
OUT - 10
IN - 3
OUT - 4
DeviceNet™ (data bus)
PT 5-HF-5DC
1&5
2&6
IN - 9
OUT - 10
IN - 3
OUT - 4
DeviceNet™ (bus power)
PT 2-PE/S-24AC
L & N (IN)
L & N (OUT)
Modbus®
(RS-232)
PT 5-HF-12DC
Txd - 1
Rxd - 7
Txd - 2
Rxd - 4
IN - 9
OUT - 10
IN - 3
OUT - 4
Modbus +
PT 5-HF-12DC
Pair 1 - 1 & 5
Pair 2 - 7 & 11
Pair 1 - 2 & 6
Pair 2 - 8 & 12
IN - 9
OUT - 10
IN - 3
OUT - 4
Genius® I/O
PT 2X2-12DC
S1 - 1
S2 - 5
S1 - 2
S2 - 6
IN - 9
OUT - 10
IN - 3
OUT - 4
Profibus DP
(up to 12 Mbit/s)
PT 5-HF-12DC
DATA (+) - 1
DATA (–) - 5
DATA (+) - 2
DATA (–) - 6
IN - 9
OUT - 10
IN - 3
OUT - 4
PT 5-HF-5DC
DATA (+) - 1
DATA (–) - 5
DATA (+) - 2
DATA (–) - 6
IN - 9
OUT - 10
IN - 3
OUT - 4
Ethernet (10Base-T)
PT 5-HF-5DC
Pair 1 - 1 & 5
Pair 2 - 7 & 11
Pair 1 - 2 & 6
Pair 2 - 8 & 12
IN - 9
OUT - 10
IN - 3
OUT - 4
T1/E1
PT 5-HF-12DC
Pair 1 - 1 & 5
Pair 2 - 7 & 11
Pair 1 - 2 & 6
Pair 2 - 8 & 12
IN - 9
OUT - 10
IN - 3
OUT - 4
ISDN
PT 5-HF-5DC
Pair 1 - 1 & 5
Pair 2 - 7 & 11
Pair 1 - 2 & 6
Pair 2 - 8 & 12
IN - 9
OUT - 10
IN - 3
OUT - 4
Foundation Fieldbus - Data
PT 3-HF-12DC
Pair 1 - 1 & 5
Pair 2 - 7 & 11
Pair 1 - 2 & 6
Pair 2 - 8 & 12
IN - 9
OUT - 10
IN - 3
OUT - 4
- Power
PT 2-PE/S-24AC
L & N (IN)
L & N (OUT)
Txd - 2 (or 8)
Rxd - 4 (or 12)
IN - 3
OUT - 4
IN - PE
OUT - PE
INTERBUS
INTERBUS MUX
Ethernet (10Base-5)
2
IN - PE
OUT - PE
Phoenix Contact
2558A
Data Signal Protection
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Common Protection Methods
Figure 1. RS-485 (2-wire)
Figure 2. RS-422
Figure 3. RS-232
2558A
Phoenix Contact
3
Data Signal Protection
Figure 4. Profibus
Figure 5. Modbus +
Figure 6. Data Highway
2558A
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Sales: 1-800-888-7388 • Technical Service: 1-800-888-7388
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