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Instructional Leaflet IL70C1037H05
Effective October 2009
Digitrip models 520, 520i; and 520M, 520Mi,
520MC, 520MCi trip units for use only in
Magnum and Magnum DS circuit breakers
EATON CORPORATION www.eaton.com
Appendix D: Modbus translator wiring
The Digitrip 520MC in a Magnum breaker can communicate its
data using ModbusT RTU protocol by employing a mMINT device
to act as a translator from INCOME communication to Modbus
communications. A Modbus master device is shown wired to
gather data.
The mMINT module Cat. No. MMINT uses DIN rail mounting.
Connector types are plug-in-Phoenix. Power is 5-pin.
INCOM network uses a 3-pin. The RS-485 Modbus uses a 4-pin
connector that consists of signals A, B, COMmon, and SHielD.
Three baud rates of 1200, 9600, or 19200 are selectable via
programming switch for the Modbus network. The INCOM
baud rate is fixed at 9600 baud.
Figure 51. Modbus Translator Wiring
B-2
B-1
Digitrip 1150
B-2
B-1
Digitrip 1150
a
Control voltage is 120 Vac ± 20% or 24–125 Vdc.
b
Communication cable is Eaton style 2A957805G01 or Belden 9463 cable.
c
The overall network will support up to 32 devices with any addresses from 1–247.
d
Terminating resistor is 121 ohm 1 watt. Use the mMINT switches to insert these terminators at the mMINT device.
e
Ground cable shield at this terminal.
Magnum Circuit Breaker
Magnum Circuit Breaker
Modbus Master
mMINT
COM inv Non Invert Input
A B COM SH
a
c
d
d
b
d
e
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