YASKAWA LA500, Technical Manual, Page: 145 / 376

Network
Communications
6
6.1 MEMOBUS/Modbus Communications
YASKAWA SIEPYEULA5001C LA500 Technical Manual 145
• 0002H: Frequency Reference = 60.00 Hz (6000 = 1770H)
• 0004H: Torque Limit = 150.0% (1500 = 05DCH)
Table 6.11 Message Example When Writing to Non-Consecutive Holding Registers
Byte
Command Message Response Message (When Normal) Response Message (When There is a Fault)
Setting Data
(Hex.)
Setting Data
(Hex.)
Setting Data
(Hex.)
0 Slave address 01 Slave address 01 Slave address 01
1 Function code 67 Function code 67 Function code E7
2
Subfunction
Code
Upper 01
Subfunction
Code
Upper 01 Error code 02
3 Lower 0E Lower 0E
CRC-16
Upper EA
4
Data Quantity
Upper 00
Data Quantity
Upper 00 Lower 31
5 Lower 02 Lower 02 -
6
Byte No.
Upper 00
CRC-16
Upper D5 -
7 Lower 04 Lower FC -
8
Holding register
1 No.
Upper 00 - -
9 Lower 02 - -
10
Holding register
1 data
Upper 17 - -
11 Lower 70 - -
12
Holding register
2 No.
Upper 00 - -
13 Lower 04 - -
14
Holding register
2 data
Upper 05 - -
15 Lower DC - -
16
CRC-16
Upper 55 - -
17 Lower 59 - -
Note:
The number of bytes set in the command message set the data quantity × 2 during the command message.
◆
Enter Command
When you use MEMOBUS/Modbus communications to write parameters from the PLC to the drive, H5-11
[Comm ENTER Command Mode] lets you use the Enter command to enable these parameters. This section gives
information about the Enter command.
■
Types of Enter Commands
The drive supports the two Enter commands shown in Table 6.12 .
Write 0 to register number 0900 or 0910 (Hex.) to enable the Enter command. You can only write to these
registers. If you read to these registers, it will cause an error.
Table 6.12 Types of Enter Commands
Register No.
(Hex.)
Description
0900
When you write parameter data to the EEPROM, you will enable the data on the RAM at the same time.
This process saves the parameter changes even if you de-energize the drive.
0910
This updates the data on the RAM, but does not write data to the EEPROM.
If you de-energize the drive, you will lose the parameter changes.
Note:
•
You can write the EEPROM to the drive a maximum of 100,000 times. Do not frequently execute the Enter command (0900 (Hex.))
that is written to EEPROM.
• The Enter command register is write-only. If this register is read, it will cause a Register Number Error (02 (Hex.)).
• When the command data or broadcast message is transmitted to the drive, the Enter command is not necessary.