The MM4 has two separate serial interface ports, which operate independently. An RS485 port is available through terminals 14 and 15 (MM420) or terminals 29 and 30 (MM430 and MM440), and an RS232 port is available on the interface connector. This allows various options and arrangements to be connected:
1. Fitting an AOP or BOP directly to the MM420:
In this case the AOP or BOP use the RS232 interface built into the interface connector. This allows the RS485 interface, at terminals 14 and 15 (MM420) or terminals 29 and 30 (MM430 and MM440), to be used for other communications if required.
2. Using the BOP/AOP single mounting kit (6SE6400-0PM00-0AA0):
This kit simply extends the existing RS232 interface, bringing connections and power from the interface connector to terminals, which can then be wired to the AOP or BOP mounted in the door. Tests indicate that, although RS232 should be limited to 5m of cable, up to 20m of cable can operate satisfactorily, but this is not guaranteed. Again, the RS485 interface is available for other uses.
3. Using the AOP mounting kit (6SE6400-0MD00-0AA0):
In this installation, the AOP connects to the RS485 interface on the MM4 and also takes 24V power from the unit. If further inverters are connected, they can be “daisy chained” using the RS485 terminals on each inverter. The AOP can then communicate with all inverters using the RS485. RS485 connections can operate over long distance, typically several hundred meters, but the connection from the AOP to the inverter includes the supply, so this should be limited to 10m.
An isolated RS232 interface is also provided on the kit, which allows communication between the AOP and a computer for example. In this case, the PC communicates with the AOP, which then communicates with the drives.
The DIP switch on the unit allows the use of a BOP in the unit in place of the AOP when only one drive is used. To enable this function, close switch one. Note this function has not been tested. Switch 2 has no function, and should not be used.
An additional AOP or BOP can be optionally fitted to any inverter as this uses the RS232 interface.
4. PC to MM4 Connection Kit (6SE6400-1PC00-0AA0):
This kit enables a PC to communicate using the RS232 interface via a simple adaptor and RS232 cable. The adaptor incorporates optical isolation. The RS485 terminals are available for other uses.
5. Communications Options – PROFIBUS (6SE6400-1PB00-0AA0):
When the PROFIBUS module is fitted to the inverter, the RS485 interface is not available. The RS232 interface may be used for BOP, AOP connections etc.
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