YASKAWA SI-P3 Technical Manual page 18

7 Conventional Formats
Byte
17
Starting resistor No.
18
19 Number of data items
20
Data 1
<1>
21
22
Data 2
<1>
23
24
Data 3
<1>
25
26
Data 4
<1>
27
28
29 Reserved
30
31 Handshaking register
<1> Data is returned only for the read command.
If an error occurs, the SI-P3 card 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 Technical Manual for the drive 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
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.
18
Name
Starting resistor No.
Write: Set double number of written data items
Read: Set double number of read data items
Data word 1
Data word 2
Data word 3
Data word 4
Refer to
Table 15 Parameter Settings Using MEMOBUS/Modbus Commands
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 42A YASKAWA AC Drive-Option Card PROFIBUS-DP Technical Manual
Handshaking Register on page 19.
Command Message Response Message
10H
02H
80H
02H
17H
70H
00H
00H
00H
00H
00H
00H
00H
00H
00H
80H
Function
High Byte
Low Byte
High Byte
Low Byte
High Byte
Low Byte
High Byte
Low Byte
High Byte
Low Byte
Data
Response Message (at Fault)
10H 90H
02H 00H
80H 00H
02H 02H
00H 00H
00H 02H
00H 00H
00H 00H
00H 00H
00H 00H
00H 00H
00H 00H
00H 00H
00H 00H
00H 00H
80H 80H
<2>