Data Blocks; Templates For Data Blocks; Channel Db - Siemens S7-300 Operating Instructions Manual

7.5

Data blocks

7.5.1

Templates for data blocks

The included FM352LIB library contains a block template (UDT) for the different variants of
the machine data DB. Based on this UDT, you can create data blocks with user-specific
numbers and names. You generate channel and diagnostic DBs as instances of FB 1 and
FB 2.
7.5.2

Channel DB

Task
The channel DB forms the data interface between the user program and the FM 352
electronic cam controller. It contains and accepts all data required for controlling and
operating the module.
Configuration
The channel DB is divided into various areas:
Address* /version switch
Control signals
Checkback signals
Function switches
Trigger bits for write jobs
Trigger bits for read jobs
Done bits
Error bits
Job management for functions
Data for jobs
* You can enter the address in the parameter assignment interface.
FM 352 electronic cam controller
Operating Instructions, 05/2011, A5E01071724-03
Channel DB
Programming the FM 352
7.5 Data blocks
49