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9 Modbus RTU – integrated Modbus port specification
PXR Electronic trip unit
01/21 MN012005EN
www.eaton.com
49
9 Modbus RTU – integrated Modbus port specification
The internal Modbus communication module is an optional accessory for
digital NZM circuit breakers with PXR technology.
This module enables the communication between the release and a
Modbus RTU fieldbus.
If supplied with a voltage of 24 V DC, the trip unit can communicate as a
slave device via the Modbus A, Modbus B and Modbus COM contacts.
The Modbus cable has to comply with the following specifications:
•
at least one pair of twisted wires
(signal cable Modbus A, Modbus B)
•
at least one ground wire (Modbus COM)
•
HF-compatible shielding (including HF-compatible grounding)
•
compatibility with the respective environmental conditions
(temperature, humidity, chemical resistance, etc.)
•
The cross section of the wire is as follows:
The wiring is done as follows:
Figure 13: Wiring
a
Modbus RTU input cable
b
Modbus RTU output cable
c
Bus termination resistor (for the final node)
d
Modbus RTU-compatible cable: triple wire; two twisted signal wires; one shielded COM wire
e
HF-compatible functional grounding
a = 6 mm (a = 0.24
″
)
0.15 - 0.5 mm
2
AWG26 - AWG20
0.20 - 0.5 mm
2
AWG26 - AWG20
0.25- 0.5 mm
2
AWG26 - AWG21
2.0 x 0.4 mm
a
120R
A
B
COM
A
B
COM
A
B
COM
①
②
③
④
⑤
③
Содержание Power Xpert PXR 10
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