Mitsubishi QJ71MB91 - Page 248

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9.2 Program Example for Normal System Configuration
9.2.3 When using the automatic communication function and the communication by dedicated instructions on the same channel
9
PROGRAMMING
(2) Dedicated instruction execution timing
Dedicated instructions can be executed at the timing shown below.
When using the automatic communication function and dedicated instructions on the
same channel, set an appropriate request interval timer value and create a proper
program so that dedicated instructions can be executed in the right timing.( This
section (3))
Example: When automatic communication parameters 1 to 3 are set
* 1 Shows the case that the response monitoring timer has timed out due to no response from the
target slave
(3) Method for normally executing dedicated instructions
(Step 1)
Make setting in at least one of the automatic communication parameters so that
the time for dedicated instruction execution can be ensured. ( This section
(4) (a))
(Step 2)
Design the program so that dedicated instructions will be executed in the standby
status of the automatic communications set in the above (Step 1).( This
section (4) (b))
Figure 9.21 Dedicated instruction execution timing
Dedicated
instruction
executable timing
Request interval timer
Response monitoring
timer
(Broadcast)
Request
message
Response
message
Automatic
communication
parameter
1
*1
Broadcast delay
Automatic
communication
parameter
2
Automatic
communication
parameter
3
Dedicated
instruction
executable timing
Request interval timer
Response monitoring
timer
Request
message
Request
message
Request
message
Dedicated
instruction
executable timing
Request interval timer