User`s manual

288
11.4.2 Transmission procedure
The following describes the transmission procedure when a message containing user frames is transmitted to the
external device.
Procedure
*1 Designates the data of the user frame number to send.
*2 Programmable controller CPU processing
Before issuing a send request to the Q series C24, designate (write) the following data.
• Transmission user frame designation area: User frame No., transmission method and transmission order
registered in the Q series C24
• Transmission area (Buffer memory): User data corresponding to transmit message arbitrary data area
*3 When a transmission data count error or data transmission error is generated, the Q series C24 stores the error code to
the data transmission result storage area and turns on the transmission abnormal end signal (Xn1).
TO
(*2)
PRR
ON
ON
(*3)
User frame
(1st)
User frame
(nth)
User frame
(mth)
User frame
(±th)
Completion device
Status display device
at completion
1 scan
Normal
completion
Abnormal
completion
Programmable
controller CPU
External device
Programmable
controller CPU
(*1)
Arbitrary data
area
[Transmission
area data]