A control system for an elevator , comprising: a first assembly (A1) for allocating outside of a shaft of the elevator , wherein the first assembly (A1) comprises - a power switch for turning on or off the control system , - a safety unit for protecting electrical safety of the control system , especially against an electrical injury or an electrical shock occurred in the control system , - a communication unit for data communicating with the elevator and/or an external communication means , and - a bypass device for bypassing a safety chain of the elevator , especially for bypassing a door contact of a shaft door or a car door of the elevator , a second assembly (A2) for allocating inside of the shaft , wherein the second assembly (A2) comprises: - a power supply system for driving the elevator and/or for the safety chain , - a drive control unit for a drive motor of the elevator , and - a processor for data processing of the control system, and the first assembly (A1) and the second assembly (A2) are capable of communicating with each other and connecting as segments into the safety chain , characterized in that the first assembly (A1) further comprises a light switch for switching a light inside of a shaft , and the second assembly (A2) further comprises a monitoring system for monitoring the safety chain . a first assembly (A1) for allocating outside of a shaft of the elevator , wherein the first assembly (A1) comprises - a power switch for turning on or off the control system , - a safety unit for protecting electrical safety of the control system , especially against an electrical injury or an electrical shock occurred in the control system , - a communication unit for data communicating with the elevator and/or an external communication means , and - a bypass device for bypassing a safety chain of the elevator , especially for bypassing a door contact of a shaft door or a car door of the elevator , - a power switch for turning on or off the control system , - a safety unit for protecting electrical safety of the control system , especially against an electrical injury or an electrical shock occurred in the control system , - a communication unit for data communicating with the elevator and/or an external communication means , and - a bypass device for bypassing a safety chain of the elevator , especially for bypassing a door contact of a shaft door or a car door of the elevator , a second assembly (A2) for allocating inside of the shaft , wherein the second assembly (A2) comprises: - a power supply system for driving the elevator and/or for the safety chain , - a drive control unit for a drive motor of the elevator , and - a processor for data processing of the control system, and - a power supply system for driving the elevator and/or for the safety chain , - a drive control unit for a drive motor of the elevator , and - a processor for data processing of the control system, and the first assembly (A1) and the second assembly (A2) are capable of communicating with each other and connecting as segments into the safety chain , characterized in that the first assembly (A1) further comprises a light switch for switching a light inside of a shaft , and the second assembly (A2) further comprises a monitoring system for monitoring the safety chain . <EOS>