If you are intending to purchase a new TS4-F system, one of the first decisions is the choice of signal transmission sources.The TS4-F series requires a "keep-alive" signal to activate the MLPEs. The PLC (Power Line Communication) transmission of the "keep alive" signal is received by the TS4-F / TS4-A-F units, and when the signal ceases (transmitter turned off) the system automatically goes into rapid shutdown mode. This signal can be supplied by any one of these sources:
