Siemens SIMATIC S5-95F, Manual

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Testing the User Program and Storing It on the Memory Submodule S5-95F
Which Blocks Need to be Stored on the EPROM?
The following table shows which blocks you must store on the EPROM and which are optional.
Table 14-9. Blocks Which Must be Stored on the EPROM
Block ... Compulsory/
Optional
Remarks
OB, PB
SB, FB
Compulsory Organization blocks, program blocks, sequence blocks and
function blocks make up the executable program.
DB 1 Compulsory DB 1 contains the system parameters. You generate it with
COM 95F.
DB with
constant
contents
Compulsory Data blocks with constant contents must not change when
the system is in operation. You must specify the numbers
of the data blocks with constant contents with COM 95F.
DBwith
variable
contents
Optional Data blocks with variable contents may be changed by the
user program during operation. You must specify the
numbers of the data blocks with variable contents with
COM 95F.
If you do not want to store these data blocks on the
EPROM, you may also generate them in the user program.
Parameter
control DB Optional You can change the parameter control DB by programmer
input in safety STOP mode. You must set the number of
the parameter control DB with COM 95F.
If you do not want to store this data block on the EPROM,
you may also generate it in the user program.
DB 252
DB 253
Optional Data blocks DB 252 and DB 253 contain the Send and
Receive mailboxes for failsafe data interchange.
If these data blocks are not stored on the EPROM, they are
generated automatically by the S5-95F.
DB 254 Optional DB 254 contains the S5-95F system messages. If this data
block is not stored on the EPROM, it is generated
automatically by the S5-95F.
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14-16
EWA 4NEB 812 6210-02