Reading User Frames - Mitsubishi MELSEC L Series User Manual

9.4.2 Reading user frames

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9 CONTENTS AND REGISTRATION OF THE USER FRAMES FOR DATA COMMUNICATION
The following shows an example of a sequence program when reading user frames
registered in the Q series C24 flash ROM.
For details on the GETE instruction, see Section 17.5.
(When the Q series C24 I/O signals are X/Y80 to X/Y9F)
POINT
(1) When an unregistered user frame number is designated, the operation will
complete abnormally.
(2) When the total bytes of data registered in the frame to be read is unknown,
read 40 words (80 bytes) by the dedicated instruction.
(3) The SPBUSY instruction can be used to read the communication status by the
dedicated instruction.
Read request
Sets the frame No. to be read
Sets the allowable number of data to be read
Clears the device in which to store the read
user frame data
Executes user frame reading
Normal completion
Abnormal completion
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