Auto synchronous output module and system

A system for synchronizing the power supplied to alarm output devices at different zones in a life safety system, wherein the output devices are controlled by auto synchronous output modules at the respective zones and wherein the output devices are supplied with power from different power sources comprising:

• a loop controller at a central location;
• the modules including a power source and output devices;
• the modules being connected in groups along a data loop for receiving activate commands in the form of control signals from the loop controller so as to activate the output devices responsive to alarm conditions at the zones;
• the modules including means operative when an activate command is received for suspending the application of power to the output devices for a predetermined time interval until a subsequent, synchronize command is received, whereby all activated output devices are then synchronized.