Introduction to STEP 5
S5-100U
7.4
Program Processing
Some of the organization blocks (OBs) are responsible for structuring and managing the control
program.
These OBS can be grouped according to the following assignments:
•
OBs for START-UP program processing
•
One OB for cyclic program processing
•
OBs for time-controlled program processing
•
OBs for (process) interrupt-driven program processing
The S5-100U has additional OBs whose functions are similar to those of integral function blocks
(e.g., PID control algorithm). These OBs are described in chapter 9.
Section 7.3.1 summarizes all of the OBs.
Comparing Programming Possibilities for CPU 100, CPU 102, and CPU 103
Table 7-5. Programming Possibilities
CPU
CPU 100
CPU 102
CPU 103
Cyclical
Yes
Yes
Yes
Interrupt-driven
No
No
Yes
(for 8MA02 and higher)
Time-controlled
No
No
Yes
(for 8MA02 and higher)
Integral FBs
No
Yes
(for 8MA02 and higher)
Yes
Graph 5
No
No
Yes
Programmable FBs
No
No
Yes
Beginning with section 7.4.2, you learn which special organization blocks each of the CPUs has
available to perform the programming tasks described in Table 7-5. You also learn which pre-
cautions you need to take when you program.
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Summary of Contents for SIMATIC S5-100U
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