Control Procedure Of The On-Demand Function (Command: 2101) - Mitsubishi MELSEC Q Series Reference Manual

3.11.3 Control procedure of the on-demand function (command: 2101)

[Control procedure]
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3 WHEN COMMUNICATING USING THE QnA COMPATIBLE 3E/3C/4C FRAMES OR 4E FRAME
The examples in this section explain the control procedure for sending on-demand
data to an external device with the on-demand function.
The arrangement and contents of the data items shown in the control procedure
diagram differ depending on the frame and format used in communication.
When the communication protocol setting in the programming tool is "1" to "4", the on-
demand data is transmitted in A compatible 1C frames. For the arrangement of data
items and contents of each format for A compatible 1C frames, refer to Section 5.1.
When the communication protocol setting in the programming tool is "5", the on-
demand data is transmitted in QnA compatible 4C frames (format 5). For the
arrangement of data items and contents of the format 5 for QnA compatible 4C frames,
refer to Section 3.1.
The following examples show the control procedure in format 1 of the A compatible
frame and the format 5 of QnA compatible 4C frame.
(1) Format 1
(a) When the "Word/byte units designation" in GX Works2 or GX Configurator-
SC is set to "0" (word units)
The following diagram shows the control procedure when two words are
designated as transmission data.
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