Safety Library

Introducing the Safety Library

When you install Control Expert Safety, a safety library of elementary functions (EFs), elementary function blocks (EFBs), and derived function blocks, (DFBs) are automatically included. These EFs, EFBs, and DFBs are identified by the prefix “S_” and are reserved for use in code sections managed by the SAFE task.

NOTE: Also installed is an additional collection of EFs, EFBs and DFBs. This is the same collection of data objects used by non-safety M580 PACs. These EFs, EFBs, and DFBs can be used only in code sections managed by process namespace tasks (MAST, FAST, AUX0, and AUX1).

For a description of the blocks included in the M580 safety library, refer to the Control Expert Safety Block Library document.

Certified Safety Functions and Function Blocks

WARNING

UNEXPECTED APPLICATION BEHAVIOR

Do not use V1.00 of the S_GUARD_LOCKING derived function block in your application.
In Unity Pro 13.0 XLS or later, update the S_GUARD_LOCKING function block in your application with V1.01 or later, and rebuild the application.

Failure to follow these instructions can result in death, serious injury, or equipment damage.

NOTE:

Unity Pro is the former name of Control Expert for version 13.1 or earlier.

These are the subset of EFs and Functions Blocks, which can be used inside safety logic. These are provided in the Safety Library:

Family	Group or Name	Type	Description
Logic	S_AND_, S_OR_, S_XOR_, S_NOT_, S_SHL_, S_SHR_, S_ROR_, S_ROL_	EF	Type specific, e.g. S_AND with 2 to 32 inputs (inline code)
Logic	S_RS, S_SR, S_F_TRIG, S_R_TRIG	EFB	–
Mathematics	S_ADD_, S_MUL_, S_SUB_, S_DIV_, S_ABS_, S_SIGN_, S_NEG_*, S_MOVE, S_SQRT_REAL	EF	Type specific detected error handling (e.g. overflow) to be considered (inline code)
Comparison	S_GT_, S_GE_, S_LT_, S_LE_, S_NE_, S_EQ_	EF	Type specific (inline code)
Statistical	S_LIMIT_, S_MAX_, S_MIN_, S_MUX_, S_SEL	EF	Type specific (inline code)
Type To Type	S_BIT_TO, S_BOOL_TO_, S_BYTE_TO_, S_DINT_TO_, S_DWORD_TO_, S_INT_TO_, S_REAL_TO_, S_TIME_TO_, S_UDINT_TO_, S_UINT_TO_, S_WORD_TO_*	EF	Type specific (inline code)
Timers & Counters	S_CTU_, S_CTD_, S_CTUD_*	EFB	Type specific
Timers & Counters	S_TON, S_TOF, S_TP	EFB	–
Peer to peer	S_RD_ETH_MX, S_WR_ETH_MX, S_RD_ETH_MX2, S_WR_ETH_MX2	DFB	Functions to perform a Safety peer to peer communication
Actuator Connection	S_EDM, S_ENABLE_SWITCH, S_ESPE, S_OUTCONTROL, S_GUARD_LOCKING, S_GUARD_MONITORING, S_MODE_SELECTOR	DFB	Machine Safety Function Blocks linked to actuators
Sensor Connection	S_EQUIVALENT, S_ANTIVALENT, S_EMERGENCYSTOP, S_TWO_HAND_CONTROL_TYPE_II, S_TWO_HAND_CONTROL_TYPE_III, S_MUTING_SEQ, S_MUTING_PAR, S_AI_COMP	DFB	Machine Safety Function Blocks linked to sensors
System	S_SYST_STAT_MX, S_SYST_TIME_MX, S_SYST_CLOCK_MX, S_SYST_RESET_TASK_BIT_MX, S_SYST_READ_TASK_BIT_MX	EFB	System function blocks

Non-Certified Safety Functions and Function Blocks

These are the subset of Derived Functions Blocks (DFBs), which can be used inside safety logic. These function blocks are not certified. Their purpose is to provide you sample safety function blocks that can be easily reused and adapted. You can copy and paste these function blocks into your application and change them to meet the requirements of your application.

Family	Group or Name	Type	Description
High Availability MX	S_DIHA, S_AIHA	DFB	Function for high availability SIL2 or SIL3 digital input modules (inline code)
Sensor Connection	AI_COMP	DFB	Machine Safety Function Blocks linked to sensors

Viewing the Safety Library in Control Expert

For an example of how some of the safety blocks are implemented, refer to the PAC-to-PAC communication configuration example, which includes S_RD_ETH_MX and S_WR_ETH_MX.

Also refer to the EcoStruxure™ Control Expert Safety Block Library for a description of each available safety function and block.