Publication 1756-RM004B-EN-P - October 2000
CIP Messaging API 4-3
The relationship between these components, the CIP API, and the
application is shown in figure 4.2.
Figure 4.2 1756-MVI CIP API System Data Flow Diagram
For more information about these components, refer to the Introduction
to ControlLogix Module Development, CID#X1557.
All data exchange between the application and the backplane occurs
through the Assembly Object, using the functions provided by the CIP
API. Included in the API are functions to register or unregister the
object, accept or deny Class 1 scheduled connection requests, access
scheduled connection data, and service unscheduled messages.
The backplane device driver is designed to support multi-threaded
applications. Critical sections are protected to guarantee data integrity.
CPI API Interface
Application
ControlBus
Connection
Mapping
CD
CM
UCMM
MR
ID Object
ICP Object
NVS Object
Transports
Assembly
Object
Backplane
Device Driver
Application
Code
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