4
MODBUS(R) STANDARD FUNCTIONS
4.1 MODBUS(R) Standard Function Support List
4
- 6
1
O
VER
VIE
W
2
SYS
T
E
M
CO
NF
IG
U
R
A
T
IO
N
3
S
P
E
CIFICA
TI
ONS
4
MODB
US
(R)
S
TAN
DAR
D
FUN
C
TIO
N
S
5
FUNC
TI
ON
6
PR
E
-O
PER
A
T
ION
AL
P
R
OCED
URE
S A
ND
SE
TTINGS
7
P
A
RA
MET
E
R S
E
TTI
N
G
8
UTIL
ITY P
A
CK
AGE
(G
X Co
nf
ig
u
rat
o
r-M
B)
: Supported
: Not supported
* 1 Since the MBREQ instruction allows users to create request message frames, function codes other
than the above can be also sent. (
Remark
The usable functions are limited when the QJ71MB91 is installed to a
MELSECNET/H remote I/O station.(
Table4.2 Standard function support list for the master and slave functions (Continued)
Function
code
(Sub code)
Sub-function
code
Function
Master function
Slave
function
Automatic
communication
function
MBRW
instruction
MBREQ
instruction
*1
08
17
Return slave busy count
18
Return bus character overrun count
19
Return IOP overrun error count
20
Clear overrun counter and flag
11
-
Get communications event counter
12
-
Get communications event log
15
-
Write multiple coils
16
-
Write multiple registers
17
-
Report slave ID
20(6)
-
Read file record
21(6)
-
Write file record
22
-
Mask write register
23
-
Read/Write multiple registers
24
-
Read FIFO queue
43
-
Read device identification
Summary of Contents for QJ71MB91
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