JEPMC-W531403 YASKAWA

If the slave address specified in the command message is 0, all slaves execute the write function, but do not

return response messages to the master.

Description:

The Drive has a built-in function for self-diagnosing the operations of serial communication interface circuits. The

self-diagnosis function connects the communication parts of the send and receive terminals, receives the data sent by the

Drive, and checks if communication is being performed normally.

Perform the self-diagnosis function using the following procedure.

1. Turn ON the power supply to the Drive, and set parameter H1-05 (Terminal S7 Function Selection) to 67 (Comm Test

Mode).

2. Turn OFF the power supply to the Drive.

3. Perform wiring according to the following diagram while the power supply is turned OFF.

4. Turn ON the terminating resistance. (Turn ON pin 1 on DIP switch 1.)

5. Turn ON the power supply to the Drive again.

6.During normal self-diagnostic operation, the Digital Operator displays the frequency reference value. If an error occurs, a

CE (Modbus communication error) alarm will be displayed on the Digital Operator, the fault contact output will be turned

ON, and the Drive operation ready signal will be turned OFF.

Slave Not Responding

In the following cases, the slave will ignore the write function. 

• When a communication error (overrun, framing, parity, or CRC-16) is detected in the command message.

• When the slave address in the command message and the slave address in the Drive do not agree.

• When the data that configures the message and the data time length exceed 24 bits.

• When the command message data length is invalid.

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