Omron CJ2 CPU - REV 10-2010 User Manual page 53

Synchronous Unit Operation (CJ2H CPU Units with Unit Version 1.1
or Later)
A CJ2 CPU Unit can synchronize the start of the processing performed by
CPU Bus Units and Special I/O Units to a specified cycle.
Synchronous data refreshing can be used between the CPU Unit and Synchronous Units,* and the
refreshed data can be used in operations in a synchronous interrupt task. This enables multiaxis
control with minimal fluctuations in the timing from inputs and processing to outputs. This provides
support for motion applications that require precise timing, such as electronic cam control.
* Synchronous Units are CPU Bus Units and Special I/O Units that support the synchronous unit operation func-
tion. Only the CJ1W-NC214, CJ1W-NC234, CJ1W-NC414, and CJ1W-NC434 Position Control Units support
synchronous unit operation as of July 2010.
CJ2 CPU Units (with unit
version 1.1 or later)
Example:
Electronic cam control
Easier Programming
Address offsets can be specified.
When an address is specified for an instruction operand, an offset can be specified in brackets after
the address to offset it. For example, by setting a word address in brackets to specify the offset, the
address can be dynamically specified according to the contents of that word.
Example
W0.00[D0]: W0.00 is the starting address and the contents of D0 is the offset. If D0 is &3, then
W0.03 is specified.
Symbols can be specified for array variable subscripts.
By specifying symbols for array variable subscripts, elements can be dynamically specified accord-
ing to the values of the symbols.
Example
a[b]: The value of symbol b specifies the element for array variable a[ ].
CJ2 CPU Unit Software User's Manual
Synchronous Units
Example:
Position Control Units
Several servomotors are controlled synchronously
based on the operation of the encoder.
1 Overview
Synchronous data
refreshing
Motor drive
Servomotor
1
1-7