Rules Governing the Use of the S5-115F S5-115F Manual
!
Important
The following are not permissible
• LIR and TNB operations with their source addresses to the I/O area (<1000
H
,
>EFFF
H
) and to the system area (EA0A...EA0E).
(LIR and TIR are word operations. The highest accessible address is therefore EFFE
H
and not EFFF
H
).
• TIR and TNB operations with destination addresses to the I/O area (<1000
H
,
>EFFF
H
) and to the system area (EA0A...EA0E).
(LIR and TIR are word operations. The highest accessible address is therefore EFFE
H
and not EFFF
H
).
• L PY and L PW for reading AI modules.
10.7.2 Illegal Memory Area
Direct access to the memory area C400
H
to EFFF
H
with T IR and T NB is illegal.
This memory area is used by the operating system.
10.7.3 Illegal STEP 5 Operations and Statements
In order to guarantee the safety of plants requiring official approval, the possibility of systematic
errors by the user must be eliminated. Systematic errors have the same effect on both subunits.
Note
Organize your programs as clearly as possible!
The following are not permitted
• Trick programming
• T DL, T DR and T DW operations in DB 1, DB 2, DB 3, configuration DBs and DBs stored on the
EPROM/EEPROM submodule.
• DO FW; DO DW, DI and JU R operations in safety-related programs.
• Programming of RLO-dependent operations and jump operations within parentheses.
• Accessing system data SD5 to SD7.
10-12
EWA 4NEB 811 6148-02
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