Contents
Fail-Safe Systems
A5E00085588-03
xiii
6 Operation and Maintenance 6-1
6.1 Operation and Maintenance of the F-Systems .................................................6-1
6.2 Rules for Operation...........................................................................................6-1
6.3 Working with the Safety Program .....................................................................6-2
6.4 Changing the Safety Program...........................................................................6-3
6.5 Replacing Software and Hardware Components..............................................6-4
6.6 Uninstalling the S7 F/FH System......................................................................6-5
7 Safety 7-1
7.1 Standards, Certificates and Approvals..............................................................7-1
7.2 Safety Requirements.........................................................................................7-4
7.3 System Configuration........................................................................................7-7
7.4 Monitoring Times...............................................................................................7-8
7.4.1 Configuring the Monitoring Times for F/FH Systems........................................7-8
7.4.2 Calculation of the Minimum Monitoring Times................................................7-10
7.5 Acceptance of an F-System............................................................................7-14
7.5.1 Initial Acceptance of a Safety Program...........................................................7-15
7.5.2 Acceptance of Changes to the Safety Program..............................................7-20
7.5.3 Acceptance of F-Block Types .........................................................................7-22
7.5.4 Responsibilities and Qualifications .................................................................7-22
8 Fail-Safe Blocks 8-1
8.1 Overview ...........................................................................................................8-1
8.1.1 Fail-Safe Blocks ................................................................................................8-1
8.1.2 F-Data Types.....................................................................................................8-2
8.1.3 Block I/Os..........................................................................................................8-4
8.1.4 Block Numbers..................................................................................................8-6
8.1.5 Installation in Cyclic Interrupt OBs ....................................................................8-8
8.2 Driver Blocks for F-I/Os.....................................................................................8-9
8.2.1 F_CH_DI .........................................................................................................8-10
8.2.2 F_CH_DO........................................................................................................8-13
8.2.3 F_CH_AI..........................................................................................................8-16
8.2.4 Common Features of the Driver Blocks..........................................................8-22
8.3 Blocks for F Communication Between CPUs..................................................8-25
8.3.1 F_SENDBO.....................................................................................................8-27
8.3.2 F_RCVBO .......................................................................................................8-29
8.3.3 F_SENDR........................................................................................................8-31
8.3.4 F_RCVR..........................................................................................................8-33
8.4 Blocks for Converting Data .............................................................................8-35
8.4.1 F_BO_FBO......................................................................................................8-36
8.4.2 F_I_FI..............................................................................................................8-37
8.4.3 F_R_FR...........................................................................................................8-38
8.4.4 F_TI_FTI..........................................................................................................8-39
8.4.5 F_FBO_BO......................................................................................................8-40
8.4.6 F_FI_I..............................................................................................................8-41
8.4.7 F_FR_R...........................................................................................................8-42
8.4.8 F_FR_FI ..........................................................................................................8-43
8.4.9 F_FTI_TI..........................................................................................................8-44
8.4.10 F_QUITES.......................................................................................................8-45
8.5 F-System Blocks .............................................................................................8-47
8.5.1 F_S_BO...........................................................................................................8-48
8.5.2 F_R_BO ..........................................................................................................8-49
8.5.3 F_S_R .............................................................................................................8-51
8.5.4 F_R_R.............................................................................................................8-52
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