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Connecting to a PLC (MBUS)
This topic describes how to connect the SmartLogger to a PLC (MBUS).
Context
The RS485 port of a PLC (MBUS) is an RJ45 port that should be connected to an RJ45 connector, as shown in Figure 4-27.
Table 4-8 lists the cable colors and functions.
There are three RS485 ports in the SmartLogger. For the port descriptions, see Context in Connecting the SmartLogger to the SUN2000.
Figure 4-28 shows how to connect the SmartLogger to the PLC (MBUS).
Procedure
- Choose a shielded network cable of appropriate length. Crimp an RJ45 connector at one end and connect it to the RS485 port of the PLC (MBUS).
- Connect the other end of the cable to the COM port of the SmartLogger. For details, see 2–4 in Procedure in Connecting the RS485 Signal SPD.
- Connect the RS485+ port of the PLC (MBUS) to the COM+ port of the SmartLogger and connect the RS485- port of the PLC (MBUS) to the COM- port of the SmartLogger.
- The PLC (MBUS) cannot be detected automatically. You need to add this device manually on the LCD or WebUI. For details about this operation, see Managing Devices or Connecting Devices.
- The Huawei PLC (MBUS) supports auto-negotiation of baud rate 9600 bps/115200 bps. If the PLC (MBUS) networking is used, you are advised to set Baud rate to 115200 bps for the RS485 ports of the SmartLogger to achieve better communication performance.
