YASKAWA Varispeed E7 Instruction Manual And Parameter Description page 212

Loopback Test
The loopback test returns command messages directly as response messages without changing the contents to
check the communications between the master and slave. You can set user-defined test code and data values.
The following table shows a message example when performing a loopback test with the slave no. 1.
Command Message
Slave address
Function code
Higher
Test Code
Lower
Higher A5H
Data
Lower
Higher DAH
CRC-16
Lower 8DH
Writing to Multiple Inverter Memory Registers
The writing of inverter memory registers works similar to the reading process, i.e. the address of the first reg-
ister that is to be written and the quantity of to be written registers must be set in the command message.
The to be written data must be consecutive, starting from the specified address in the command message. The
data order must be higher 8 bits, then lower 8 bits. The data must be in memory register address order.
The following table shows an example of a message where a forward operation has been set with a frequency
reference of 60.0 Hz for the inverter with the slave address 01H.
Command Message
Slave Address
Function Code
Higher
Start
Address
Lower
Higher
Quantity
Lower
No. of data
Higher
Lead data
Lower
Higher
Next data
Lower
Higher
CRC-16
Lower
For the number of data value in the command message the double value of the data quantity must be
taken.
IMPORTANT
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Response Message
(During Normal Operation)
01H Slave address
08H Function code
00H Higher
Test Code
00H Lower
Higher
Data
37H Lower
Higher
CRC-16
Lower
Response Message
(During Normal Operation)
01H Slave Address
10H Function Code
00H Higher
Start
Address
01H Lower
00H Higher
Quantity
02H Lower
04H Higher
CRC-16
00H Lower
01H
02H
58H
63H
39H
Individual Functions
Response Message
(During Error)
01H Slave address
08H Function code
00H Error Code
00H Higher
CRC-16
A5H Lower
37H
DAH
8DH
Response Message
(During Error)
01H Slave Address
10H Function Code
00H Error code
01H Higher
CRC-16
00H Lower
02H
10H
08H
* No. of data = 2 x (quantity)
01H
89H
01H
86H
50H
01H
90H
02H
CDH
C1H
75
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