Abstract: A safety-related control unit for controlling an automated installation in accordance with an application program containing control instructions. The safety-related control unit has first and second processors for executing at least some of the control instructions by processing a plurality of first and second program variables, respectively. The first processor also determines a first test value for at least one of the first program variables in accordance with an instantaneous value present for this first program variable at a first defined instance of time. The second processor determines a second test value for the at least one of the first program variables. The second test value corresponds to the first test value. The safety-related control unit also has a data memory for storing the instantaneous value, the first test value and the second test value in order to facilitate a quick restart of the control unit after an unexpected interrupt.

Abstract: A safety controller designed to control an automated installation having a plurality of sensors and a plurality of actuators. A method for generating a user program for the safety controller comprises the step of generating a source code having a number of control instructions for controlling the actuators and having a number of diagnosis instructions for producing diagnosis reports. Safety-related program variables are processed in failsafe fashion during execution of the control instructions. A machine code is generated on the basis of the source code. At least one checksum is determined for at least some of the machine code. The diagnosis instructions are ignored for the determination of the checksum.

Abstract: A method for creating a user program for a safety controller designed to control an automated installation having a plurality of sensors and a plurality of actuators involves several programming steps. The user program comprises a first program portion, in which safety-related program variables are processed in failsafe fashion, and comprises at least one second program portion, in which non-safety-related program variables are processed, wherein failsafe processing is not necessary for the non-safety-related program variables within the second program portion.

Abstract: A safety-related control unit for controlling an automated installation in accordance with an application program containing control instructions. The safety-related control unit has first and second processors for executing at least some of the control instructions by processing a plurality of first and second program variables, respectively. The first processor also determines a first test value for at least one of the first program variables in accordance with an instantaneous value present for this first program variable at a first defined instance of time. The second processor determines a second test value for the at least one of the first program variables. The second test value corresponds to the first test value. The safety-related control unit also has a data memory for storing the instantaneous value, the first test value and the second test value in order to facilitate a quick restart of the control unit after an unexpected interrupt.

Abstract: A safety controller designed to control an automated installation having a plurality of sensors and a plurality of actuators. A method for generating a user program for the safety controller comprises the step of generating a source code having a number of control instructions for controlling the actuators and having a number of diagnosis instructions for producing diagnosis reports. Safety-related program variables are processed in failsafe fashion during execution of the control instructions. A machine code is generated on the basis of the source code. At least one checksum is determined for at least some of the machine code. The diagnosis instructions are ignored for the determination of the checksum.

Abstract: A method for creating a user program for a safety controller designed to control an automated installation having a plurality of sensors and a plurality of actuators involves several programming steps. The user program comprises a first program portion, in which safety-related program variables are processed in failsafe fashion, and comprises at least one second program portion, in which non-safety-related program variables are processed, wherein failsafe processing is not necessary for the non-safety-related program variables within the second program portion.