Proceedings
of the Tomsk Order of the Red Banner of Labor Polytechnic
Institute named after S. M. Kirov

Volume 155　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　1968

AUTOMATIC REMOTE ALARM SIGNALING SYSTEM AT FACILITIES

V. M. NOVITSKY, A. P. POLISHCHUK, A. A. FINKEL

(Presented by the scientific seminar of the Department of Automation and Telemechanics)

The remote signaling system developed at the Department of Automation and Telemechanics of the Tomsk Polytechnic Institute is intended for automatic signaling of the emergency state of facilities. The system is based on the group polling method and time-division multiplexing of communication channels with cyclic synchronization of the distributors.

The system serves twenty monitored points (groups of facilities), to each of which up to 12 facilities are connected. The equipment of a monitored point includes: a sensor unit \(D\), a coincidence-circuit unit \(CC\), a group distributor \(GR\), a starting unit \(PU\), a local signaling unit, a line unit, and a power supply (Fig. 1).

The dispatcher half-set of the system consists of a central point and ten remote dispatcher points. The latter are installed at various points of the enterprise and, in their design, with the exception of the selection circuits for the corresponding signals (the starting-pulse selection circuit \(SPI\), the reset-pulse selection circuit \(SIS\), the communication-line fault-pulse selection circuit \(IPL\)) and the distributor \(R\), are analogous to the central point, whose main units are line units \(LB1 \div LB20\), the central distributor \(P\), the group-selection distributor \(RVG\), the unit for indicating the number of the group of facilities \(BIGO\), the unit for indicating the number of the facility in the group \(BINO\), the communication-line monitoring unit \(KLS\), and a power supply.

The distributor of the central dispatcher point, which is a ring-type multiphase multivibrator, controls the switching of the group-selection distributor \(RVG\), which issues a signal to the corresponding line unit in order to prepare it for sending into the communication line the starting pulse from the central distributor \(P\).

The starting pulse, arriving through the corresponding line unit at the starting unit \(PU\) of the monitored point, starts its group distributor, also constructed according to the circuit of a multiphase multivibrator, after which the polling cycle of the coincidence circuits \(CC1 \div CC12\) begins. The presence, at one of the coincidence circuits, of an emergency signal issued by sensors \(D1 \div D12\) leads to the sending of the corresponding signal into the communication line. At the same time, the signal from the coincidence-circuit unit is fed to cells \(MC1—MC12\) of the local signaling unit.

At the end of the polling cycle of the given \(KP\), a control pulse enters the communication line from the last cell of the distributor.

Fig. 1. Block diagram of the signaling system

At the central DP, the alarm signal, through the corresponding line unit and switch \(K\), is fed to the coincidence circuits of the BINO and BIGO units. The coincidence circuits of the BINO unit are scanned by the central distributor \(P\), and, when an alarm signal is present, they issue a pulse to the corresponding indication cell \(YaI1 \div YaI12\) in order to light one of the lamps \(LS1 \div LS12\), indicating the number of the emergency facility in the group.

The group-selection distributor RVG, simultaneously with issuing a signal to one of the line units, issues an enabling signal to one of the coincidence circuits of the BIGO unit. Therefore, when an alarm signal arrives at the BIGO unit, the corresponding coincidence circuit issues a signal used to indicate the number of the group of facilities in which the accident has occurred.

From its last cell, distributor \(P\) issues a pulse to the \(KLS\) node, as a result of which the latter forms a signal that closes switch \(KL\). In this case, the check pulse, sent from each \(KP\) once per scanning cycle to the BIGO and BINO units, is not received.

If the line is damaged, then the absence of the check pulse will cause the “Line Damage” lamp and one of the lamps indicating the number of the group connected to the damaged line to light.

REFERENCES

1. V. A. Ilyin. Telecontrol and Remote Control of Dispersed Facilities. GEI, 1963.

2. Ya. I. Belenkii, V. N. Mikhailovskii. A high-speed multichannel distributor. Automation and Telemechanics, vol. XXII, No. 8, 1961.