SF_ESPE (Electro-Sensitive Protective Equipment)

Tip

The version of the function block as described here corresponds to the latest version of the function block in Version list of function blocks.

Applicable safety standards

SF_ESPE is a certified PLCopen function block. For detailed information about applied standards, see "PLCopen – Technical Committee 5 – Safety Software".

Important

The requirements listed in the standards must be fulfilled by the user.

Interface description

This safety-oriented block is used to monitor electro-sensitive protective equipment.

Table 31. VAR_INPUT

Name	Data Type	Initial Value	Description, parameter values
`Activate`	`BOOL`	`FALSE`	General input parameters
`S_ESPE_In`	`SAFEBOOL`	`FALSE`	Input which requests safety. Variable `FALSE`: `ESPE` actuated, request for safety-oriented response. `TRUE`: `ESPE` not actuated, no request for safety-oriented response. The safety controller has to be able to detect a very short interruption of the sensor when the `ESPE` is used as a trigger in applications.
`S_StartReset`	`SAFEBOOL`	`FALSE`	General input parameters
`S_AutoReset`	`SAFEBOOL`	`FALSE`	General input parameters
`Reset`	`BOOL`	`FALSE`	General input parameters

Table 32. VAR_OUTPUT

Name	Data Type	Initial Value	Description, parameter values
`Ready`	`BOOL`	`FALSE`	General output parameters
`S_ESPE_Out`	`SAFEBOOL`	`FALSE`	Output for safety-oriented response `FALSE`: Safety output is inactive. Request for safety-oriented response (for example, reset required or internal error active) `TRUE`: Safety output is activated. No requirement for safety-oriented response.
`Error`	`BOOL`	`FALSE`	General output parameters
`DiagCode`	`WORD`	`16#0000`	Diagnostic codes

Figure 68. Function block: SF_ESPE

Functional description: SF_ESPE

This FB is a safety-oriented function block for monitoring electrosensitive protective equipment (ESPE). Its function is identical to SF_EmergencyStop. The S_ESPE_Out output signal is set to FALSE as soon as the S_ESPE_In input signal becomes FALSE. The S_ESPE_Out output signal is set to TRUE only if the S_ESPE_In input is TRUE and a reset occurs. The active reset depends on the defined S-StartReset, S_AutoReset, and Reset.

If S_AutoReset = TRUE: Acknowledgment is automatic.

If S_AutoReset = FALSE: A rising trigger edge at the Reset input must be used to acknowledge the enable.

If S_StartReset = TRUE: Acknowledgment is automatic the fist time the S-PLC is started.

If S_StartReset = FALSE: A rising trigger edge at the Reset input must be used to acknowledge the enable.

Caution

The S_StartReset and S_AutoReset inputs shall only be activated if it is ensured that no hazardous situation can arise when the S-PLC is started.

Tip

The function of the SF_ESPE and SF_EmergencyStop FBs is identical. Therefore, for further details, see the SF_EmergencyStop function block (Functional description).