4
MODBUS(R) STANDARD FUNCTIONS
4.11 Diagnostics (FC: 08)
4.11.5 Force listen only mode (sub-function code: 04)
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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)
POINT
1. Whether the QJ71MB91 has been switched to listen only mode or not can be
checked in the Communications mode of the buffer memory (address: 0F0D
H/
0F4D
H).
0000
H: Online mode
0001
H: Listen only mode
2. The listen only mode can be changed to online mode by either of the
following:
• Restart communications option ( Section 4.11.2)
• Power OFF ON, programmable controller CPU reset
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