Specifications

The CP143plus firmware CP143 H1 / TCP/IP manual
4-10 Rev. 00/07
4.2 The CP143plus firmware
Fig. 4-4 shows the structure of the CP143plus firmware. This figure contains those components that
interact to determine the characteristics of the CP.
4.2.1 Components
The individual components communicate via the operating system functions of a real-time kernel
(RTK). In addition to this, class libraries have been defined which provide a defined CALL
interface.
4.2.1.1 Interface
The interface between the PLC and the CP is provided by a dual-port-RAM that has been divided
into four equal segments, so-called tiles. In a multi-processor PLC every CPU may communicate
independently with the CP143plus by means of one of these four tiles.
The handler modules send-request and receive-request have been implemented by the use of
interrupts (interrupt handler) and by exchanging data via the dual-port-Ram.
4.2.1.2 H1-application
The H1-application is the protocol controller for the functions defined for the CP.
4.2.1.3 H1-interface
The H1-API-calls are available as a class library and they define the interface for the protocol stack.