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10 CHANGING DATA COMMUNICATION MONITORING TIME
10.2 Response Monitoring Time (timer 1) Setting
Changing the response monitoring time (timer 1)
The response monitoring time (timer 1) is registered on "Response monitoring time (timer 1) designation" of the parameter.
Navigation window [Parameter] [Module Information] "Module Name" [Module Parameter] "Basic Settings"
"Various control specification"
During data communications using the MC protocol, set the response monitoring time so as to be as long as the transmission
wait time or longer.
The transmission wait time is designated in the following:
• 1C frame: Designate it is a command message.
• 2C/3C/4C frame: "Transmission wait time designation"
Considerations for data communications using the MC protocol
When changing the response monitoring time (timer 1) default value (5 sec), take into account the following.
Set it as to be as long as the transmission wait time or longer in either case of the following. (Page 235 Transmission Wait
Time Setting)
■When specifying monitor condition
When designating the monitor conditions with the following functions, set the maximum time according to the system
operation.
• Random read in word units
• Device memory monitor
■When accessing by other than above
• When accessing a station connected (including multidrop connection) to a target device, set the following value, or longer.
Response monitoring time Maximum number of scans required to process the command used Connected station scan
time
• When accessing another station over a network system, set the default value to 'Unlimited wait', or the following time or
longer.
Response monitoring time maximum number of scans required to process the command used communications time
When setting the default value to 'Unlimited wait', check the target device response wait time, and initialize C24 transmission
sequence when time-out occurs.
For the maximum number of scans and the communication time required by processing, refer to the following manual.
MELSEC Communication Protocol Reference Manual
Considerations for data communications using bidirectional protocol
when changing the default value (5 seconds) for the response monitoring time (timer 1), set it as to be as long as the following
time, or longer.
• (Sequence scan time 2) + 100 ms
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