User's Manual

Automation and Drives - SCE
T I A Training Document Page 21 of 25 Module
4. WRITING A STEP 7 PROGRAM
We are writing the program to be tested in the statement list language (STL), and it only contains two
lines.
Here, the frequencies of the MB100 clock memory byte activated in the hardware are to be read out
on an output byte.
Assignment list:
MB100 Clock Clock memory byte
AB0 AB Display
A cycle duration/frequency is assigned to each bit of the clock memory byte. Assignment is as
follows:
Bit: 7 6 5 4 3 2 1 0
Clock duration (s): 2 1.6 1 0.8 0.5 0.4 0.2 0.1
Frequency (Hz): 0.5 0.625 1 1.25 2 2.5 5 10
14. In the 'SIMATIC Manager', mark the 'Blocks' folder.( → SIMATIC Manager → Blocks)
Foreword Notes Hardware configuration STEP 7 program Testing
A5
Issue date: 02/2008 Programming the CPU 314C-2DP