YASKAWA SI-P3/V Technical Manual page 22

7 Conventional Formats
If an error occurs, the SI-P3/V unit sets the MSB (Most Significant Bit) in the MEMOBUS/Modbus response code to 1
and returns the error response. The number of data items is set to 02H and one of the following error codes is written into
the Low Byte of Data 1. Refer to the Communication Errors in Appendix C of the V1000 Technical Manual for the
details of the MEMOBUS/Modbus Error Codes.
Parameter Settings Using MEMOBUS/Modbus Commands
The written or read data of each parameter is transferred in a hexadecimal value.
Negative values are expressed as a two complement.
Example 1:The frequency reference is 30Hz.
30 Hz/0.01 Hz = 3000 → BB8H
Example 2:–5% is assigned as the bias for terminal FM of multi-function analog output 1.
5/0.1 = 50 → 32H
Converted into a two complement → FFCEH
Example 3:60.00 Hz is assigned for d1-01 (register No.: 0280H).
60.00Hz/0.01Hz = 6000 → 1770H
Table 16 Parameter Settings Using MEMOBUS/Modbus Commands
Byte
16 Function code
17
Starting Register No.
18
19 Number of Data Items
20
Data 1
21
22
Data 2
23
24
Data 3
25
26
Data 4
27
28
29 Reserved
30
31 Handshaking Register
<1> Depends on the status of the previous data.
<2> Depends on the status of the fault.
22
Name
High Byte
Low Byte
High Byte
Low Byte
High Byte
Low Byte
High Byte
Low Byte
High Byte
Low Byte
<1>
YASKAWA ELECTRIC SIEP C730600 23B V1000 Option PROFIBUS-DP Technical Manual
Command Response
Message Message
10H 10H
02H 02H
80H 80H
02H 02H
17H 00H
70H 00H
00H 00H
00H 00H
00H 00H
00H 00H
00H 00H
00H 00H
00H 00H
00H 00H
00H 00H
80H 80H
Data
Response Message (at
Fault)
<2>
90H
00H
00H
02H
00H
02H
00H
00H
00H
00H
00H
00H
00H
00H
00H
80H