Modbus Communication
‑29‑
Table 2–5 FAQ and Solutions
FAQ
Solution
Failure to write
frequency
1. Check the address in the configuration table based on F0‑03.
When F0‑03 is set to 0, the address should correspond to the
value of F0‑08. When F0‑03 is set to 9, the address should be
1000H or 7310H.
2. Check whether the termination resistor is connected. If not,
connect the termination resistor and then power on the AC
drive again.
Failure to start the AC
drive
1. Ensure that F0‑02 is set to 2 (communication). 0 means
operating panel and 1 means terminal.
2. Check whether the termination resistor is connected. If not,
connect the termination resistor and then power on the AC
drive again.
Unstable connection
1. Ensure stable connection on PLC side.
2. Ensure stable connection on AC drive side.
3. Check whether the signal cable is close to the power cable.
Keep the signal cable away from the power cable.
Incorrect reading
1. Ensure that the address configured is correct.
2. Ensure that data conversion is performed.
3. Ensure that the D element is not occupied.
2.6.2 Configuration for RS485 Communication Between AC Drive and
AM600
The following describes how to configure the AM600 series PLC to control the AC drive
to run forward or backward.
Hardware Wiring
Port definition:
● AM600 provides two sets of RS485 ports that share one DB9 connector. The
following figure shows the ports.
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