Abstract
This chapter describes the remote-control and remote-signaling systems. The remote-control and remote-signaling systems effect the transmission of discrete messages, namely, commands for the control of production plants and indications of the variation of the operating conditions of these plants. Both in remote control and remote signaling, the problem reduces to generating, transmitting, and decoding a finite number of discrete signals corresponding to commands and indications. Owing to this, design methods of remote-control and remote-signaling systems are similar. Moreover, one and the same apparatus usually performs remote-control and remote-signaling functions. The chapter illustrates a remote control and signaling system in the general case. The sending of commands from the control post is accomplished by acting on individual command elements (the unit 1). The command-signal-forming unit 2 forms a signal that is transmitted over the communication channel to the executive post. Here, the signal is decoded by a discriminator as a result of which the individual component intended for the execution of the given command is actuated (the unit 4). The latter component acts on the corresponding executive organ of the object to be controlled and monitored.
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