ABB AC500-S Safety User Manual page 278

Configuration and programming
AC500-S libraries > SafetyBlocks_PLCopen_AC500_v22.lib
The function block represents the interface between the user program and system environment.
Fig. 111: Example of SF_SafetyRequest
This function block provides the interface to a generic actuator, e.g. a safety drive or safety
valve, to place the actuator in a safe state.
This FB provides the interface between the safety-related system and a generic actuator. This
means that the safety-related functions of the actuator are available within the application pro-
gram. However, there are only two binary signals to control the safe state of the generic
actuator, i.e., one for requesting and one for receiving the confirmation.
The safety function will be provided by the actuator itself. Therefore the FB only initiates the
request, monitors it, and sets the output when the actuator acknowledges the safe state. This
will be indicated with the S_SafetyActive output.
This FB does not define any generic actuator-specific parameters. They should have been
specified in the generic actuator itself. It switches the generic actuator from the operation mode
to a safe state.
Table 63: FB name: SF_SafetyRequest
Name Data type
VAR_INPUT
Activate BOOL
S_OpMode BOOL
278
Initial value Description, parameter values
Ä Table 16 "General input parameters" on page 192
FALSE
FALSE Variable.
Requested mode of a generic safe actuator.
FALSE: Safe mode is requested.
TRUE: Operation mode is requested.
3ADR025091M0208, 12, en_US 2020/06/19