Cpu Parameter Assignment; Cpu Containing Safety Program Must Have A Password - Siemens SIMATIC S7 F Manual

Configuration
4.3

CPU Parameter Assignment

Rules for Configuration as an F-CPU
Safety Note – CPU containing safety program must have a password
!
The user must comply with the following rules:
•
The "CPU Contains Safety Program" option must be selected.
•
A password must always be assigned.
You must make these settings via the CPU's object properties in HWCONFIG.
Procedure
1. Select the desired CPU in HWCONFIG, and then choose the Edit > Object
Properties menu command.
2. Select the protection level you want for the CPU, and then enter a password in
the text boxes provided.
3. Select the "CPU Contains Safety Program" option on the "Protection" tab.
Important Parameters for the CPU in the S7 FH System
To prevent time monitoring during a master/standby switchover, you must
configure the OB3x provided for Safety Programs with a priority > 15 on the "Cyclic
Interrupts" tab.
The cyclic interrupt OB of the Safety Program must be configured as a "Cyclic
Interrupt OB with Special Handling". Only then will this cyclic interrupt be called
during updating of the standby for priority classes > 15 directly before the start of
the blocking time. To do this, go to the "H Parameters" tab in the CPU properties,
and then enter in the "Cyclic Interrupt OB with Special Handling" text box the
number of the highest priority cyclic interrupt OB to which blocks of the Safety
Program section are assigned in CFC.
Fail-Safe Systems
A5E00085588-03
4-3