SmartPLC SafeLine AC4S with fieldbus interfaces
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8.2.1 Supported program organization units (POUs)
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The programming code is entered in the POUs (program organization unit). CODESYS Safety
provides 2 POU types for safe programming. They differ in the scope of usable functions.
Network, assignment, input
Network, assignment, input, jump, return
ADD, SUB, MUL, DIV, EQ, NE LT, LE, GT,
GE
Safety standard functions
(safetystandard.lib)
SF_CTD, SF_CTUD, SF_CTU, SF_TOF,
SF_TON, SF_TP
SF_RS, SF_SR, SF_CTD, SF_CTUD,
SF_CTU, SF_TOF, SF_TON, SF_TP,
SF_F_TRIG, SF_R_TRIG
Safety PLCopen functions
(safetyplcopen.lib)
For using extended POUs the developer must be a member of the user group
"Safety.ExtendedLevel" (→ Create user account (→ S. 19)).
The use of extended POUs requires a more complex verification process due to the higher
complexity of the program code.
► If possible, only use basic POUs to create a safe application.
The "SafetyPOU" created during the creation of the safety project is of type Basic POU
(→ Objects of a safe application (→ S. 71)).
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8.2.2 Available safety libraries
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To create safe applications the programmer can use the following libraries with certified safety
functions:
Device-specific safety function blocks
→Use safety functions of the ifm AS-i
package (→ S. 76)
Safe standard function blocks
(bistable function blocks, counters, timers, triggers)
→SafetyStandard library (→ S. 79)
Safety function blocks of PLCopen Safety
→SafetyPLCopen library (→ S. 80)
Function block for FSoE transmission
→SafetyFSoEMaster library (→ S. 81)
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8.2.3 Supported programming languages
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Following table shows which programming languages according to IEC 61131-3 are supported by
certified safety libraries:
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