Transmission Wait Time Setting; C24 Operation By Transmission Wait Time; Changing The Transmission Wait Time - Mitsubishi Electric MELSEC iQ-R Series User Manual

10.4

Transmission Wait Time Setting

The transmission wait time is used during data communications using the MC protocol.
It is the time for a target device that cannot receive the data immediately after data has been transmitted.
When C24 transmits a response message in reply to a command message received from the target device, transmission of
the response message is delayed by the transmission wait time, or longer.
The following explains the transmission wait time operation for data communications using 2C/3C/4C frame. (For 1C frame,
the transmission wait time is designated in the command message.)
Command
Target device
message
CPU module

C24 operation by transmission wait time

When transmission wait time is set to 0 ms
If a response message can be transmitted, C24 immediately transmits the response message. A transmission wait time is not
set.
When the transmission wait time is set to 10 ms or longer
If a response message can be transmitted, and the transmission wait time after reception of the command message has
elapsed, C24 transmits the response message.

Changing the transmission wait time

The transmission wait time is registered on "Transmission wait time designation" of the parameter.
Navigation window  [Parameter]  [Module Information]  "Module Name"  [Module Parameter]  "Basic Settings"
 "Various control specification"
• If the target device that must wait a certain time before it can receive a response message after a command message was
transmitted, set the transmission wait time as explained above.
Especially, for data communications with a target device connected to C24 RS-422/485 interface, set the transmission wait
time to the hardware gate OFF time or longer of the target device.
• The transmission wait time described here is the time for data communications using the 2C/3C/4C frame.
Response
message
Message wait time
10 CHANGING DATA COMMUNICATION MONITORING TIME
10.4 Transmission Wait Time Setting
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