TPG CA-202A - 6-6 Processing Time of Communication Transmission; 6-7 Communication Troubleshooting

6-6 Processing Time of Communication Transmission
The communication waits for 10ms to start the communication transmission after the
drive powers on or the communication function of the drive changes. The drive
needs 5ms processing time to return the message to the host after the message are
received from the host. If the host only broadcasts to the drive, the host can start
sending the message code after 5ms.
Note: if the message code is to “Read” or “Write” the parameter, the drive needs
100ms processing time to return the message to the host.
6-7 Communication Troubleshooting
1. When error occurs at the communication network, the drive provides the
self-testing function to identify where error occurs. Please check
communication function settings to verify the validity of functions.
2. When the host receives returned error messages from a drive, the host
sends the invalid operation command to drive. The following table is the error
message format.
CRC Checksum
Address OP Code Error Code
LSB MSB
02H 1xxxxxxxB xxH xxH xxH
OP code sets MSB (bit7) as 1 for the original command message, but error code
gives different values according to different types of errors. The below table is
describing types of error code:
Error
Code
Error Type Descriptions
00 Parity error of serial communication
01 Data frame error of serial communication
02
Serial communication
format error
Over-bit error of serial communication
03 Modbus OP code error OP code is not in either 03H,06H,08H, or 10H
04 Modbus CRC error CRC checksum error
05
Modbus data range
error
1. Data length in transmission not matched with
the protocol
2. Data range over the register length at “write”
06
Modbus register
characteristics error
Registers writes into read-only registers
07 Modbus register error No-defined registers
88