Enter Command; Self-Diagnostics - Omron Q2A Series Technical Manual

6.2 Modbus Communications
Command Message
Byte
10
Holding register
1 data
11
12
Holding register
2 No.
13
14
Holding register
2 data
15
16
CRC-16
17
Note:
The number of bytes set within the command message determines the data quantity × 2 during the command message. The response
message uses the same formula.
◆

Enter Command

When you use Modbus communications to write parameters from the PLC to the drive, the Mbus ENTER
Command Mode setting sets the function to enable these parameters from the Enter command. This section gives
information about the Enter command.
■
Types of Enter Commands
The drive supports the two Enter commands shown in the following table.
Register No.
(Hex.)
When you write parameter data to the EEPROM, you will enable the data on the RAM at the same time.
0900
This process saves the parameter changes until you de-energize the drive.
This updates the data on the RAM, but does not write data to the EEPROM.
0910
This process saves the parameter changes until you de-energize the drive.
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.
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.
◆

Self-Diagnostics

The drive can use Self-Diagnostics to find the operation of the serial communications interface circuit. Self-
Diagnostics connects the transmission terminal to the reception terminal on the control circuit. It then transmits
the data sent by the drive and makes sure that the drive can communicate correctly.
Use this procedure to do Self-Diagnostics:
1.
Energize the drive.
2.
Set H1-06 = 7F [DI6 Function Selection = Comms Test].
3.
De-energize the drive.
224
Setting Data
(Hex.)
Upper 17
Lower 70
Upper 00
Lower 04
Upper 05
Lower DC
Upper 55
Lower 59
Table 6.9 Types of Enter Commands
Response Message
Setting Data
(when Normal)
(Hex.)
-
-
-
-
-
-
-
-
Description
Response Message
(when There is a Fault)
-
-
-
-
-
-
-
-
SIEPYEUOQ2A01A AC Drive Q2A Technical Manual
Setting Data
(Hex.)