Mitsubishi QJ71MB91 - Page 121

5
FUNCTIONS
5.2 Master Function
5.2.1 Automatic communication function
5 - 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)
(d) The Broadcast delay times out
When the Broadcast delay times out after transmission of a request message, it
means normal completion, and the corresponding bit in the buffer memory's
automatic communication operating status storage area turns OFF. (address:
0C20
H to 0C21H/0C22H to 0C23H)
(e) Receiving response message from slave
When slave processing is complete, a response message is received.
Figure 5.5 Timeout of Broadcast delay
Figure 5.6 Reception of response message
Slave 1
Slave 2
Slave 3
Broadcast delay
Broadcast delay times out
Request
message
Request
message
Request
message
processing
Request
message
processing
Request
message
processing
Request
message
processing
Request
message
processing
Request
message
processing
Master
(QJ71MB91)
Master
(QJ71MB91)
Slave
Request
message
Request
message
processing
Receiving
response
message
Request
message
Receiving response message
from the slave
Request
message
processing
Response
Message
Receiving
response
message
Response
Message