Mitsubishi MELSEC-A series User Manual

6. PROGRAMMtNG /MELSEC-A
6.3 ACPU Programming
6.3.1 Data read and write precautions
(1) Data read from and written to the sequence program should be
kept to a minimum for optimum program scan time. The
majority of the AD71 data must therefore be written to the
buffer memory by the GPP.
(2) The parameters and zeroing data is checked at power on and
when the PC ready signal (Y 1 D) changes from OFF to ON.
(3) Positioning data is checked immediately before it is processed.
Any error will cause the error signal (XB) to switch on and, in
most cases, positioning to stop.
Pattern 00
Pattern 11
Pattern 01
0 0
Pattern 00
Positioning operation ,
Dwell
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Data @) check Data @ check Data @ check
Fig. 6.3 Positioning Data Check
An error is flagged if the total distance requested exceeds the
upper (or lower) stroke limit when incremental position address-
ing is used.
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IB INA) 66101.A

Mitsubishi MELSEC-A series Specifications

General

Brand	Mitsubishi
Model	MELSEC-A series
Category	Controller
Language	English