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Introduction to STEP 5
Function of DB1
DB1 is provided for parameterization of the S5-95F. It contains (default) values that you can either
accept or change (see section 9.3). DB1 is evaluated once during start-up, in other words, either
after Power ON or after a transition from STOP to RUN.
Parameter Control Data Block for Programmer Operation in the Safety Mode
In the safety mode, you must neither change the control program nor the data blocks via the
programmer. The only exception is the parameter control DB. You should use the parameter control
DB always when you wish to change individual values not earlier than "during operation" via the
programmer, e.g. if you wish to change recipes. In the safety mode, changing via the programmer is
possible only in the STOP mode with the programmer function "Output block".
To ensure that your system does not go into an impermissible state, you must check all values,
which you operate in the safety mode, for plausibility and reliability. This check is to be carried out in
a filter program in OB21 or OB22.
You specifiy the number of parameter control DBs via COM 95F; it must not lie in the range of the
DBs with constant contents.
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 S5-95F 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 "Integrated Blocks".
Section 7.3.1 summarizes all of the OBs.
7-18
S5-95F
EWA 4NEB 812 6210-02
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