Pre-Read Buffer - Mitsubishi Electric MELSEC iQ-R16MTCPU Programming Manual

Fetching program file during operation using file transmission via FTP server
The following describes the procedure for fetching program file during operation using the file transmission via FTP server.
Refer to the following for details of file transmission via FTP server.
MELSEC iQ-R Motion Controller Programming Manual (Common)
Operating procedure
1.
Store the G-code program file in storage folder for the G-code program file ($MMTPRJ$/gcode/prog/temp).
2.
Set the program No. (1 to 256) of the G-code program to be fetched in "[Cd.3305] Program No. for loading while running
(D54264)".
3.
Turn ON "[Rq.3344] Program load request while running (D54225.0)".
4.
When completed successfully, "2: Successfully completed" is stored in "[Md.3003] Program load status while running
(D54492)". When failed "3: Failed" is stored.
5.
When fetching program files consecutively, repeat procedures 2. to 4.
■Used devices
The following devices are used in the transmission of G-code programs by file transmission via FTP server.
Refer to G-code control dedicated signals for details of the devices. (Page 28 G-CODE CONTROL DEDICATED
SIGNALS)
• [Rq.3344] Program load request while running (D54225.0)
• [Cd.3305] Program No. for loading while running (D54264)
• [Md.3003] Program load status while running (D54492)
• [Md.3004] Program load error information while running (D54493)
5.3

Pre-read Buffer

Normally, in automatic operation one block is read in advance to facilitate smooth program analyzing. Also, during tool radius
compensation, three blocks of movement commands (up to five blocks if there are not three blocks of movement commands)
are read in advance in order to calculate the intersection that includes interference check.
The details of pre-read are described below.
• Pre-read saves the data of one block.
• Comments are not loaded to the pre-read buffer.
• The pre-read buffer is cleared by turning ON "[Rq.3380] Reset command (D54226.4+2s)".
• During continuous operation, when "[Rq.3379] Single block (D54226.3+2s)" is turned ON, the pre-read buffer saves the
data of the next block and stops.
5 G-CODE CONTROL PROGRAMS
5.3 Pre-read Buffer
5
95