A safety control system, comprising: a communication apparatus for transmitting and receiving communication data to/from an external controller through a network; a first processor unit for performing a control function that receives communication data transmitted from the external controller through the communication apparatus and outputs a control signal to a power converter based on the communication data, and a safety function that outputs a stop command to the power converter in response to the communication data; and a second processor unit for performing only a safety function; wherein the first processor unit includes: a control command generation device for, if the communication data includes non-safety data, generating a control signal based on the non-safety data and outputting the control signal to the power converter; a safety data transfer device for, if the communication data includes safety data, generating a first external interruption signal, which is an interruption signal for the second processor unit, and a first internal interruption signal, which is an interruption signal in the processor, and transferring the safety data to the second processor unit; a first safety data execution device for executing safety processing based on the safety data triggered by the first internal interruption signal; and a connection device for receiving a result of safety processing executed by the second processor unit, and generating communication data to be transmitted to the external controller based on the received result and an execution result of the first safety data execution device, and the second processor unit includes: a second safety data execution device that starts up with the first external interruption signal, wherein the device executes safety processing based on the safety data transferred from the first processor unit, and transmit the result of the safety processing to the first processor unit. a communication apparatus for transmitting and receiving communication data to/from an external controller through a network; a first processor unit for performing a control function that receives communication data transmitted from the external controller through the communication apparatus and outputs a control signal to a power converter based on the communication data, and a safety function that outputs a stop command to the power converter in response to the communication data; and a second processor unit for performing only a safety function; wherein the first processor unit includes: a control command generation device for, if the communication data includes non-safety data, generating a control signal based on the non-safety data and outputting the control signal to the power converter; a safety data transfer device for, if the communication data includes safety data, generating a first external interruption signal, which is an interruption signal for the second processor unit, and a first internal interruption signal, which is an interruption signal in the processor, and transferring the safety data to the second processor unit; a first safety data execution device for executing safety processing based on the safety data triggered by the first internal interruption signal; and a connection device for receiving a result of safety processing executed by the second processor unit, and generating communication data to be transmitted to the external controller based on the received result and an execution result of the first safety data execution device, and a control command generation device for, if the communication data includes non-safety data, generating a control signal based on the non-safety data and outputting the control signal to the power converter; a safety data transfer device for, if the communication data includes safety data, generating a first external interruption signal, which is an interruption signal for the second processor unit, and a first internal interruption signal, which is an interruption signal in the processor, and transferring the safety data to the second processor unit; a first safety data execution device for executing safety processing based on the safety data triggered by the first internal interruption signal; and a connection device for receiving a result of safety processing executed by the second processor unit, and generating communication data to be transmitted to the external controller based on the received result and an execution result of the first safety data execution device, and the second processor unit includes: a second safety data execution device that starts up with the first external interruption signal, wherein the device executes safety processing based on the safety data transferred from the first processor unit, and transmit the result of the safety processing to the first processor unit. a second safety data execution device that starts up with the first external interruption signal, wherein the device executes safety processing based on the safety data transferred from the first processor unit, and transmit the result of the safety processing to the first processor unit.