Yaskawa VS-616G5 Profibus-DP Control Card SI-P - Manual (Page 14)

Page 14 VS-616G5 Option Instruction Manual: Profibus-DP Control Card SI-P
MODBUS response message structure
The MODBUS response message is built up in the following way:
If a fault occurs, the option card responds with an ERROR by setting the MSB bit
in the MODBUS Response code to one (1). When this occurs, the MODBUS data
length is set to 02H and the LOW byte for Data word 1 contains the ERROR code.
Table 11: MODBUS Response Message Structure (G5 SI-P ⇒ PDP Master)
Byte Name Function
16 MODBUS Function Code MODBUS Response code.
00H:
Waiting for response from inverter.
03H: Response for read operation.
10H: Response for write operation.
83H: Read command error.
90H: Write command error.
Other: Not supported
17 MODBUS Starting address HI Inverter start address reference, HI byte
18 MODBUS Starting address LOW Inverter start address reference, LOW byte
19 MODBUS Data Length Write: No of bytes written to inverter.
Read: No. of valid bytes in the data area
20 MODBUS Data 1 HI byte for Data word 1. Read operation
21 MODBUS Data 1 LOW byte for Data word 1. Read operation
22 MODBUS Data 2 HI byte for Data word 2. Read operation
23 MODBUS Data 2 LOW byte for Data word 2. Read operation
24 MODBUS Data 3 HI byte for Data word 3. Read operation
25 MODBUS Data 3 LOW byte for Data word 3. Read operation
26 MODBUS Data 4 HI byte for Data word 4. Read operation
27 MODBUS Data 4 LOW byte for Data word 4. Read operation
28 Not used Reserved for future use
29 Not used Reserved for future use
30 Not used Reserved for future use
31 Handshake register See Handshaking Register section
Table 12: Error Code Descriptions
Error Error Code Description
Function error 01H Unregistered MODBUS function code.
Address fault 02H
Parameter address (Starting address) is greater than 600H
Designate unused parameter address.
No. of Data Faults 03H
Read more than 4 words
Write more than 4 words
Data content Fault 21H Parameter contents exceed the upper or lower limit.
— 22H Parameters are changed during running or undervoltage condition.
Write Fault 23H Write parameter during undervoltage
— 24H Write parameter during calculating parameter.