RS Automation NX-POSI1, User Manual, Page: 19 / 196

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Basic Operation of NX700 Positioning Unit
Control proceeds by turning ON and OFF the shared memory and input/output flag.
1. Determining the necessary data.
The types of data written to the positioning unit include control codes, the
startup speed, the target speed, the acceleration/deceleration time, and the
position instruction value. The types and number of required data varies
depending on the objective. Programming is set up so that these data values
may be written to any desired data register.
2. Transferring to the shared memory.
The data stored in the data registers is sent to the positioning unit by means of
the F151 or P151 instruction, where it waits for further instructions. The
memory area which receives that transferred data is called the “shared
memory” of the positioning unit. This area is used for various types of control,
including E point control, P point control, JOG operation, JOG positioning
operation, home return (home search), and pulser input operation, and a
separate shared memory area is provided for each of the axes.