Chapter 2 Modbus Standard Function List - Mitsubishi Electric MELSEC iQ-R Series Reference Manual

2
MODBUS STANDARD FUNCTION LIST
This chapter lists the MODBUS standard functions and availability for modules when using the slave function.
The modules are abbreviated as follows:
• C24: RJ71C24, RJ71C24-R2, RJ71C24-R4
• E71: RJ71EN71, R04ENCPU, R08ENCPU, R16ENCPU, R32ENCPU, R120ENCPU
: Available, : Not available
Function code Sub code (SC)
(FC)
01H 

02H
03H 

04H

05H

06H

07H

08H

0BH
0CH 

0FH
10H 

11H
14H 06H
15H 06H

16H
17H 
Diagnosis function details
Function code Sub-function
(FC) code
08H 0000H
0001H
0002H
0003H
0004H
000AH
000BH
000CH
000DH
000EH
000FH
0010H
0011H
0012H
0013H
0014H
Function name
Read coils
Read discrete inputs
Read holding registers
Read input registers
Write single coil
Write single register
Read exception status
Page 13 Diagnosis function
details
Get communications event
counter
Get communications event log
Write multiple coils
Write multiple registers
Report slave ID
Read file record
Write file record
Mask write register
Read/Write multiple registers
Function name
Return query data
Restart communications option
Return diagnostic register
Change ASCII input delimiter
Force listen only mode
Clear counters and diagnostic
register
Return bus message count
Return bus communication error
count
Return bus exception error count
Return slave message count
Return slave no response count
Return slave NAK count
Return slave busy count
Return bus character overrun
count
Return IOP overrun error count
Clear overrun counter and flag
C24 E71 Reference
  Page 14 Read Coils (FC: 01H)
 
Page 15 Read Discrete Inputs (FC: 02H)
  Page 16 Read Holding Registers (FC: 03H)
 
Page 17 Read Input Registers (FC: 04H)
 
Page 18 Write Single Coil (FC: 05H)
 
Page 19 Write Single Register (FC: 06H)
 
Page 20 Read Exception Status (FC: 07H)
 
Page 21 Diagnostics (FC: 08H)
 
Page 38 Get Communications Event Counter (FC: 0BH)
  Page 39 Get Communications Event Log (FC: 0CH)
 
Page 41 Write Multiple Coils (FC: 0FH)
  Page 42 Write Multiple Registers (FC: 10H)
 
Page 43 Report Slave ID (FC: 11H)
  Page 45 Read File Record (FC: 14H) (SC: 06H)
 
Page 47 Write File Record (FC: 15H) (SC: 06H)
 
Page 48 Mask Write Register (FC: 16H)
  Page 49 Read/Write Multiple Registers (FC: 17H)
Reference
Page 22 Return query data (sub-function code: 00H)
Page 23 Restart communications option (sub-function code: 01H)
Page 24 Return diagnostic register (sub-function code: 02H)
Page 25 Change ASCII input delimiter (sub-function code: 03H)
Page 26 Force listen only mode (sub-function code: 04H)
Page 27 Clear counters and diagnostic register (sub-function code: 0AH)
Page 28 Return bus message count (sub-function code: 0BH)
Page 29 Return bus communication error count (sub-function code: 0CH)
Page 30 Return bus exception error count (sub-function code: 0DH)
Page 31 Return slave message count (sub-function code: 0EH)
Page 32 Return slave no response count (sub-function code: 0FH)
Page 33 Return slave NAK count (sub-function code: 10H)
Page 34 Return slave busy count (sub-function code: 11H)
Page 35 Return bus character overrun count (sub-function code: 12H)
Page 36 Return IOP overrun error count (sub-function code: 13H)
Page 37 Clear overrun counter and flag (sub-function code: 14H)
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