Inovance MD520 Series - Configuration of RS485 Communication between AC Drive and AM600

Modbus Communication
‑36‑
Table 3–6 Common problems and solutions
Problem Solution
Failure to write
frequency
1. Check F0‑03 to confirm that the address in the configuration
table is correct (when F0‑03 is 0, the address is the address of
F0‑08; when F0‑03 is 9, the address is 1000H or 7310H).
2. Check whether the terminal resistor is ON. If not, switch on the
terminal resistor and then power on the AC drive again.
Failure to start the AC
drive
1. Check that F0‑02 is set to 2 (0: Operating panel; 1: Terminal; 2:
Communication).
2. Check whether the terminal resistor is ON. If not, switch on the
terminal resistor and then power on the AC drive again.
Unstable connection
1. Check that wiring on the PLC end is reliable.
2. Check that wiring on the AC drive end is reliable.
3. Check that the signal cables are far away from the power
cable.
Incorrect read value
1. Check that the configuration address is correct.
2. Check whether the program performs data conversion.
3. Make sure that the D component is not occupied.
3.6.2 Configuration of RS485 Communication Between AC Drive and
AM600
The following configuration instance illustrates how to control forward/reverse
running of the AC drive by using the AM600 series PLC.
Hardware Connection
Ports:
● AM600 provides two RS485 ports. The two RS485 channels share the same DB9
interface. For details, see the following figure.