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6-1 Introduction
The area used to exchange data (such as commands from the PC, tasks from
the MC Unit, and axis status information) between the PC and MC Unit is known
as the PC data area interface.
PC MC Unit
Execute, Pause, and Continue
Programs
Data from the MC Unit
PC data area interface
Internal processing
MC Unit data
In order to operate the PC data area interface from the PC, allocate CIO and DM
words and create a ladder program to process the data. Refer to 6-3 Controlling
the MC Unit from the PC for details on creating a ladder program to control the
MC Unit.
PC Cycle Time The cycle time will be extended as shown in the following table for each Unit
mounted to the CPU Backplane. Take this into consideration when designing the
system.
PC model C200H C200HS C200HX/HG/HE
Case 1 Approx. 4 ms Approx. 3 ms Approx. 2 ms
Case 2 Approx. 5 ms Approx. 4 ms Approx. 3 ms
Case 1: When refreshing only the I/O refresh data area (normal case).
Case 2: When refreshing the expansion data area as well.
Introduction Section 6-1
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