Siemens SIMATIC FM 351 - Templates for Data Blocks; Channel DB

Programming the FM 351
6-13
FM 351 Positioning Module
C79000-G7076-C351-02
6.5 Data Blocks
6.5.1 Templates for Data Blocks
The supplied library (FMx51LIB) contains a block template (UDT) for each data
block. Based on these UDTs, you can create data blocks with any number and
name you wish.
6.5.2 Channel DB
Task
The channel DB (see Appendix C.1, page C-2) is the data interface between the
user program and the FM 351. It contains and receives all the data required for
controlling and operating a channel.
Structure
The channel DB is subdivided into various areas:
Channel DB
Control signals
return signals
Trigger bits for read jobs
Function switches
Trigger bits for write jobs
Done bits
Module address *)
Data for jobs
Job management for functions
*) You can enter the address with
the configuration software
Error bits
Number of the parameter DB
Channel number