IFM Electronic AC402S - Use Safety Functions of CODESYS

SmartPLC SafeLine AC4S with fieldbus interfaces
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8.4 Use safety functions of CODESYS
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3S provide several libraries in the programming environment CODESYS Safety. They contain certified
function blocks (FB) by means of which the programmer can create safe applications for the fail-safe
PLC of AC4S. The libraries are automatically loaded during the creation of a safety project by means
of AC4S (→ Create new project with AC4S (→ S. 16)). The user can access the elements of the
libraries via the library manager in the safety extension area of the device tree.
Following libraries are available:
 SafetyStandard library (→ S. 79)
 SafetyPLCopen library (→ S. 80)
 SafetyFSoEMaster library (→ S. 81)
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8.4.1 SafetyStandard library
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The library SafetyStandard.lib provides safe versions of standard functions (counters, timers,
triggers, bistable functions). The library contains the following functions:
Function block
Description
SF_RS
Safe bistable function block with dominant setting
SF_SR
Safe bistable function block with dominant resetting
SF_CTD
Safe counter (down)
SF_CTUD
Safe counter (up)
SF_TOF
Safe timer with switch-off delay
SF_TON
Safe timer with switch-on delay
SF_TP
Safe timer with clock generator
SF_F_TRIG
Safe trigger with falling-edge detection
SF_R_TRIG
Safe trigger with rising-edge detection
The developer is responsible for the use of the safety standard function blocks provided in
CODESYS.
► Observe availability of the FBs (→ Supported program organization units (POUs)
(→ S. 73))!
The complete documentation of the SafetyStandard.lib can be accessed via the online
help of CODESYS Safety:
→ Online help > Add-Ons > CODESYS Safety > Libraries > SafetyStandard