Overview Of The Function Blocks; Table 6-1 Function Blocks Of The Cp 440 - Siemens SIMATIC S7-400 CP 440 Installation And Parameter Assignment

Communication via Function Blocks

6.1 Overview of the Function Blocks

6.1 Overview of the Function Blocks
Introduction
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
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.
FB 10 "SEND_440" The SEND_440 function block allows you to send all or part of a data
block to a communication partner.
FB 11 "RES_RECV" The RES_RECV function block enables you to reset the receive buffer
of the CP 440.
CAUTION
The maximum CP440 frame length was extended from 200 to 400 bytes.
Requirements:
To use this feature you have to first install version V5.1.7 or higher from the PtP - Param (see above).
During installation, the two function blocks
- FB9 V1.1 (RECV_440)
and
- FB10 V1.1 (SEND_440)
are available in the CP PtP SIMATIC Standard Library in the subfolder
using these blocks you can transfer more than 200 bytes (i.e., up to 400 bytes) with your CP440.
Application in Existing User Projects:
If you want to extend the existing CP440 applications for the operation of up to 400 bytes frame
length, you have to first delete the concerned CP440 in HW Config and then reconfigure it with a
PtP - Param V5.1.7 or higher (see above). Furthermore, you have to replace the two function blocks
FB9 and FB10 (see above) with each new version V1.1 in your user program.
86
www.gkbpx.com
Point-to-point connection CP 440 Installation and Parameter Assignment
该文档是极速PDF编辑器生成，
如果想去掉该提示,请访问并下载：
http://www.jisupdfeditor.com/
Protocol
ASCII driver, 3964 (R)
procedure
ASCII driver, 3964 (R)
procedure
ASCII driver, 3964 (R)
procedure
CP440/Blocks
. Only when
Manual, 09/2007, A5E00057742-03