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MA7200 PLUS Operating Manual
TECO – Westinghouse Motor Company Control Terminals Functions
(6)
The MA7200 PLUS inverter terminals S(+) and S(-) provide a serial communication RS485 interface with a
MODBUS protocol. PROFIBUS protocol for communication is possible with an optional PROFIBUS
Communication Card (MA-SP).
A.
MODBUS Communication Protocol
The following Fig. 4.2.5 shows the wiring interface for the MODBUS protocol.
Fig. 4.2.5 MODBUS Interface Wiring
Notes
:
1. A Host Controller with an RS485 interface can communicate with the MA7200 PLUS directly. If the Host
Controller does not have an RS485 port but does have an RS-232 port (such as PC programming), an
RS485 / RS232 converter can be used to connect between the Host Controller and the MA7200
PLUS as shown in Fig. 4.2.5.
2. A MODBUS Host Controller can network up to 31 inverters using the MODBUS communication standard.
The last MA7200 PLUS inverter at the end of the network must have a 220
Ω
terminating resistor.
3. Please refer to “MA7200 RS485 MODBUS Communication Application Manual”.
B.
PROFIBUS Communication Protocol
The MA7200 PLUS does not support the PROFIBUS protocol directly. An optional MA-SP PROFIBUS
Communication Card is available and can be placed at the control board. An external customer supplied
24V DC Power Supply is needed for all MA-SP option cards. The following Fig. 4.2.6 shows the wiring
interface for the PROFIBUS protocol.
Cont.