Communication Using Function Blocks
6-3
Point-to-point connection CP 440 Installation and Parameter Assignment
A5E00057742-02
6.2
Overview of the Function Blocks
The S7-400 programmable logic controller provides you with a number of function
blocks that initiate and control communication between the CPU and the CP 440
communication processor in the user program.
Function Blocks
The table below contains the function blocks of the CP 440 and describes their
purpose.
Table 6-1
Function Blocks of the CP 440
FB/FC
Meaning
Protocol
FB 9 “RECV_440”
The RECV_440 function block allows you to receive data
from a communication partner and store it in a data block.
ASCII driver, 3964
(R) procedure
FB 10 “SEND_440”
The SEND_440 function block allows you to send all or part
of a data block to a communication partner.
ASCII driver, 3964
(R) procedure
FB 11 “RES_RECV”
The RES_RECV function block enables you to reset the
receive buffer of the CP 440.
ASCII driver, 3964
(R) procedure
Form of Delivery and Installation
The function blocks of the CP 440 are on CD along with the parameterization
interface, the programming examples and the manual.
The function blocks are installed together with the parameterization interface.
Installation is described in Section 5.2. After installation, the function blocks are
stored in the CP 440 library.
You can open the library in STEP 7 SIMATIC Manager by choosing File > Open >
Library under CP PTP\CP 440\Blocks.
To work with the function blocks, you only need to copy the required function block
to your project.
