Omron MX2 Series - Explanation of each Function Code; Read Coil Status [01 Hex]

8 Communications Functions
8 - 11
Multi-function Compact Inverter 3G3MX2-EV2 User’s Manual (I666-E1)
8-5 Explanation of Each Function Code
8-5-1 Read Coil Status [01 hex]
Reads the coil status (ON/OFF).
The status of each multi-function input terminal is as follows.
Item
Data
Coil No.
0007 hex
0008 hex
0009 hex
000A hex
000B hex
000C hex
000D hex
Multi-function input terminal
1
2
3
4
5
6
7
Coil status
ON
OFF
ON
OFF
OFF
OFF
ON
⚫ Query
(Coil address) = (Coil number) − 1
⚫ Response
Input terminal 7
Input terminal 1
45 hex = 0100 0101
*1. Broadcasting cannot be performed.
*2. Note that the coil start address is 0006, which is 1 less than the coil number 0007: Coil start address = Coil
number - 1.
*3. Data as much as the number of data bytes will be transferred. The MSB (the first received data) has the
smallest coil address.
8
8-5 Explanation of Each Function Code
8-5-1 Read Coil Status [01 hex]
No.
Field name
Example
[hex]
1
Slave address
*1
01
2
Function code
01
3
Coil start address (MSB)
*2
00
4
Coil start address (LSB)
*2
06
5
Number of coils (MSB)
00
6
Number of coils (LSB)
07
7
CRC-16 (LSB)
9D
8
CRC-16 (LSB)
C9
No.
Field name
Example
[hex]
1
Slave address
*1
01
2
Function code
01
3
Number of data bytes
01
4
Coil data
*3
45
7
CRC-16 (MSB)
90
8
CRC-16 (LSB)
7B
Example. Reading Data from Multi-function Input Terminals 1 to 7 of
Inverter with Slave Address 1