CJ2 CPU Unit Software User's Manual - CIP ETI

1 OverviewSynchronous Unit Operation (CJ2H CPU Units with Unit Version 1.1or Later) A CJ2 CPU Unit can synchronize the start of the processing performed byCPU 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 therefreshed data can be used in operations in a synchronous interrupt task. This enables multiaxiscontrol with minimal fluctuations in the timing from inputs and processing to outputs. This providessupport 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 function.Only the CJ1W-NC214, CJ1W-NC234, CJ1W-NC414, and CJ1W-NC434 Position Control Units supportsynchronous unit operation as of December 2009.11-1 Overview of CJ2 CPU UnitsCJ2 CPU Units (with unitversion 1.1 or later)Example:Electronic cam controlSynchronous UnitsExample:Position Control UnitsExample:High-speed Counter UnitSynchronous datarefreshingEncoderMotor driveServomotorSeveral servomotors are controlled synchronouslybased on the operation of the encoder.Easier Programming Address offsets can be specified.When an address is specified for an instruction operand, an offset can be specified in brackets afterthe address to offset it. For example, by setting a word address in brackets to specify the offset, theaddress can be dynamically specified according to the contents of that word.ExampleW0.00[D0]: W0.00 is the starting address and the contents of D0 is the offset. If D0 is &3, thenW0.03 is specified. Symbols can be specified for array variable subscripts.By specifying symbols for array variable subscripts, elements can be dynamically specified accordingto the values of the symbols.Examplea[b]: The value of symbol b specifies the element for array variable a[ ].CJ2 CPU Unit Software User’s Manual1-7