Programming
Fail-Safe Systems
5-16 A5E00085588-03
Note
Please be aware that by mixing standard and fail-safe run-time groups, you
could possibly jeopardize your ‘MAX_CYC’ maximum cycle time. The more
logic you add to the other run-time groups in the fail-safe OB3x’s, the greater
the chance of encountering a scan overrun if care isn’t taken.
Defining the Run Sequence
Define the run sequence in CFC in the usual way:
1. Choose the Edit > Run Sequence menu command to open the run sequence
view.
2. Drag and drop the blocks in the run-time groups in the required sequence.
5.3.5 Interconnecting F-Driver Blocks
Available F-Driver Blocks
The Fail-safe Blocks (V1_2) library has two types of driver blocks to access the F-
I/Os:
• F channel drivers to access the input/output channels of the F-I/Os. One F
channel driver block is required for each input or output channel of an F-signal
module used. Exception: Only one F channel driver is required for two
redundant channels. You must insert the required F channel drivers in the CFC
chart.
• F module drivers for PROFIsafe communication between the safety program
and the F-I/Os. One F module driver is required for each module. You can
insert and interconnect the required F module drivers manually or
automatically.
The following F module driver blocks are available:
F-Signal Module F Module Drivers F Channel Drivers
SM 326 DI 8xNAMUR F_M_DI8 F_CH_DI
SM 326 DI 24xDC24V F_M_DI24 F_CH_DI
SM 336 AI 6x13Bit F_M_AI6 F_CH_AI
SM 326 DO 10xDC24V/2A F_M_DO10 F_CH_DO
ET 200S F-DI F_M_DI8 F_CH_DI
ET 200S F-DO F_M_DO8 F_CH_DO
ET 200S PM-E F F_M_DO8 F_CH_DO
ET 200S PM-DF F_M_DO8 F_CH_DO
The F channel drivers must be interconnected with the associated F module driver
via the CHADDRxx I/O. One MOD_D1/D2 module diagnostic block can also be
inserted for each F module driver (see the figures below).
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