Patent ID: 7291998

Claim:
An electrical control safety system comprising: a first safety device and a second safety device, the first and second safety devices being used in connection with a gate or a door, the control safety system being cyclically able to make the first safety device operate during a first operating time interval while the second safety device is disabled, and to make the second safety device operate during a second operating time interval, subsequent to the first operating time interval, while the first safety device is disabled, wherein the first safety device comprises a first photocell system, and the second safety device comprises a second photocell system, the first photocell system being composed of a first transmitter and a first receiver, and the second photocell system being composed of a second transmitter and a second receiver, the control safety system being cyclically able to make the first photocell system operate during the first operating time interval while the second photocell system is disabled, and to make the second photocell system operate during the second operating time interval, subsequent to the first operating time interval, while the first photocell system is disabled, and wherein the electrical control safety system further comprises: at least four peripheral units connected with a network, each of the at least four peripheral units being connected to a respective one of the first transmitter, the second transmitter, the first receiver, and the second receiver; and a central unit for transmitting digital information packets to the at least four peripheral units over the network.