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S5-115F Manual
10.7.4 Data Blocks Used
The following DBs are reserved in the S5-115F:
•
DB 1
•
DB 2, DB 3 as error DBs
•
Configuration DBs, listed in the directory of DB 1.
You may not assign these DB numbers in your program.
Note
The error DBs (DB 2 and DB 3) are generated and updated by the operating system and
cannot be transferred to the PLC, not even in Test mode.
The G DB operation for opening a DB must be checked closely by the acceptance official since its
effects cannot usually be detected by the function test.
10.7.5 Jump Operations to Unloaded Blocks
The operating system responds differently to jump operations to nonexistent blocks depending on
the operating mode:
•
If a jump to a nonexistent block is called in safety mode, the S5-115F enters the STOP mode.
•
If a jump to a nonexistent block is called in Test mode, it is not executed and the program
processes the next operation. The S5-115F remains in RUN mode. For this reason, it is possible
to construct the complete user program in steps in Test mode by loading successive blocks
without having to continually rewrite OB 1. This enables you to program OB 1 with all planned
block calls.
EWA 4NEB 811 6148-02
Rules Governing the Use of the S5-115F
10-13
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