Omron SYSDRIVE MX SERIES User Manual page 161

Query
No. Field name
1 Slave address
2 Function code
3 Coil start number (MSB)
4 Coil start number (LSB)
5 Number of coils (MSB)
6 Number of coils (LSB)
7 CRC-16 (MSB)
8 CRC-16 (LSB)
*1. Broadcasting cannot be performed.
*2. When specifying the value for 0 or over 32 of the reading coils, the error code "03h" is replied.
*3. Data is transferred by the number of data bytes.
The data received as the response shows the statuses of coils 7 to 14. The data received here, "P7h
= 00010111b", should be read with coil 7 as LSB, as follows:
Coil No.
Coil status
If the reading coil exceeds the defined coil range in the final coil data, such coil data is regarded as
"0" and sent.
Refer to "<Exception Response>" (page 4-74) if the coil status reading command has not been
performed normally.
<Reading the Holding Register Content [03h]>
Reads the specified number of consecutive holding register contents from the specified holding reg-
ister addresses.
(Example)
Read the factors on the past three trips from the Inverter with slave address 5.
Below are the data on past three trips:
3G3MX command
Holding register No.
Trip factor
Example
(HEX)
*1
08
01
00
07
*2
00
*2
06
0D
50
14 13 12 11
OFF OFF OFF ON
d081 (last trip)
0019h
Overvoltage (E07)
Response
No. Field name
1 Slave address
2 Function code
3 Number of data bytes
4 Coil data
5 CRC-16 (MSB)
6 CRC-16 (LSB)
10 9 8 7
OFF ON ON ON
d082 (last trip but one) d083 (last trip but two)
001Ah
Undervoltage (E09)
4-2 Function Mode
Example
(HEX)
08
01
01
*3
17
12
1A
001Bh
No trip
4-70
4