Siemens SIMATIC S7 F, Manual

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Fail-Safe Systems
A5E00085588-03
ix
Safety Notes
Keep Safety and Standard Functions Separate .............................................................1-19
Public Network Safety F-CPU Communication Not Allowed ..........................................3-12
Safety Rules for Safety Operation ....................................................................................4-2
CPU containing safety program must have a password ..................................................4-3
I/O Group Diagnosis .........................................................................................................4-5
Modify Variables can cause Shutdown ............................................................................4-7
Limiting Access through ES..............................................................................................4-8
Password Protection.........................................................................................................4-8
Safety Program and CPU Passwords should be different ...............................................4-9
Authorized use of Password...........................................................................................4-10
Compiler Generated Values off-limits...............................................................................5-5
Comparison Changes Signature ......................................................................................5-6
Symbol Table Entries for F-Blocks cannot be changed .................................................5-10
Do not change automatically inserted F-Control Blocks. ...............................................5-11
Incorrect changes to fail-safe blocks input parameters may result in the
Safety Program and its outputs being disabled. .............................................5-12
During simulation of Input Channels the Simulation value is always available
on the block’s output. ......................................................................................5-22
Automatic Reintegration may not always be possible ....................................................5-25
Startup Protection to handle short power failures in the F-I/O. ......................................5-26
Automatic Reintegration through F_QUITES .................................................................5-27
Default MAX_CYC ..........................................................................................................5-30
Safety Program must be re-compiled if S7 connections used for CPU-CPU
Communication have changed........................................................................5-32
Use F_LIM_R for plausibility check of standard to F-data conversion ...........................5-37
When Deactivating Safety Mode ....................................................................................5-40
F-Blocks outputs’ always use the preset initial values. ..................................................5-44
Safety Program on Memory Card...................................................................................5-48
Downloading ...................................................................................................................5-49
OB Cycle Times Changes Restricted .............................................................................5-50
Password Protection Level .............................................................................................5-54
Download Operation Aborted .........................................................................................5-55
Safety Program disable if change to failsafe outputs .....................................................5-56
ES changes can change signature.................................................................................5-56
Simulation Warning (V5.0 and below) ............................................................................5-59
Simulation Warning (V5.1 and above)............................................................................5-61
Allowable F Control Block comparison changes ............................................................5-75
Checking online comparison output ...............................................................................5-76
Simulation of PROFIsafe devices not permitted...............................................................6-1
Duplicate Masters must be avoided .................................................................................6-2
Safety measures must be followed...................................................................................6-2
Pulse Detection.................................................................................................................7-9
Archive STEP 7 Projects ................................................................................................7-14
Do Not Change PAR_ID and COMPLEM parameters .....................................................8-2
Do not change automatically supplied FB inputs .............................................................8-4
Fail-safe FB numbers .......................................................................................................8-7