4
MODBUS(R) STANDARD FUNCTIONS
4.1 MODBUS(R) Standard Function Support List
4 - 6
1
OVERVIEW
2
SYSTEM
CONFIGURATION
3
SPECIFICATIONS
4
MODBUS(R) STANDARD
FUNCTIONS
5
FUNCTION
6
PRE-OPERATIONAL
PROCEDURES AND
SETTINGS
7
PARAMETER SETTING
8
UTILITY PACKAGE
(GX Configurator-MB)
: 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. ( Section 10.3)
Remark
The usable functions are limited when the QJ71MB91 is installed to a
MELSECNET/H remote I/O station.( This section (3))
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
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