Explanation Of Each Function Code - Omron RX Series User Manual

8 Communications Functions
8-3

Explanation of Each Function Code

Read Coil Status [01 hex]
Reads the coil status (ON/OFF).
Precautions for Correct Use Precautions for Correct Use
In the 3G3RX-V1 Series Inverter, Read Coil Status function of Modbus communication was
changed to use the same byte order as that of the 3G3MX2 Series when transferring data over 1
byte.
Receive data in the data layout as shown below, according to the number of data bytes to be
read.
• Data received as 1-byte data (1 to 8 coils)
Coil 8 to Coil 1
• Data received as 2-byte data (9 to 16 coils)
Coil 8 to Coil 1
• Data received as 3-byte data (17 to 24 coils)
Coil 8 to Coil 1
• Data received as 4-byte data (25 to 32 coils)
Coil 8 to Coil 1
Example
To read data from multi-function input terminals S1 to S6 of the inverter with slave address 8.
The status of each multi-function input terminal is as follows.
Item
Multi-function input terminal
Coil number
Terminal status
Coil numbers 000D hex and 000E hex are OFF.
8 - 10
Coil 16 to Coil 9
Coil 16 to Coil 9
Coil 16 to Coil 9
S1 S2 S3
0007 hex 0008 hex 0009 hex
ON ON ON
High-function General-purpose Inverter 3G3RX-V1 User's Manual (I578-E1)
Coil 24 to Coil 17
Coil 24 to Coil 17 Coil 32 to Coil 25
Data
S4 S5
000A hex 000B hex
OFF ON
S6
000C hex
OFF