Omron 3G8F7-CRM21, User Manual

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Access to I/O Data Section 4-1
4-1-2 I/O Data Access Synchronous with CompoNet Communications
This is the procedure by which to use the API functions and access the I/O
data while maintaining node-by-node synchronicity.
Precautions for Correct Use
The program must be made to implement accesses to I/O data in a single
thread. This includes getting and releasing an access right. If multiple threads
access to I/O data, processes may collide and the functions may fail.
YES
NO
(Open Board)
CPNT_Open
(Start communications cycles)
CPNT_StartCycle
Loop Start
An error on the basic
status group?
Error solving
(Write OUT data)
CPNT_SetOutData
CPNT_SetBitOutData
(Read IN data)
CPNT_GetInData
CPNT_GetBitInData
Data Inputs and
Outputs
End processing
(Release Access to I/O)
CPNT_ReleaseAccessToIO
Loop End
(Stop communications cycles)
CPNT_StopCycle
(Close Board)
CPNT_Close
Initial processing
(Get Access to I/O)
CPNT_GetAccessToIO
(Read Basic status group)
CPNT_GetStatus