JPH0527998A - Switching control system - Google Patents

Abstract

PURPOSE:To constitute the system with the minimum number of signal lines by unnecessitating connection from a control unit to a unit to be controlled individual signal lines by transmitting the switching request signal of the own station to the control unit with each unit to be controlled according to a time slot allocate signal. CONSTITUTION:An (n) pieces of units 2-1-2-n to be controlled are connected to a control unit 1, and a time slot allocate signal (1) is impressed from the unit 1 to the units 2-1-2-n. The units 2-1-2-n receiving this signal (1) transmit a switching request signal (2) to the unit 1 at a time slot when detecting the time slot allocated to the own station. Thus, since the switching request signal is loaded with time division and impressed to the control unit 1 at the respective units to be controlled, only the signal line for the time slot allocate signal (1) and the signal line for the switching request signal (2) are enough for this system.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching control system, and more particularly, to a plurality of control units connected to one control unit, which control unit normally operates to separate a controlled unit from a controlled unit at the time of a failure which has generated a switching request signal. The present invention relates to a switching control system for switching to the controlled unit.

Generally, in a system that requires real-time data such as monitoring data, when a unit that collects the data fails, another standby unit or a normal unit is switched to constantly ensure normal data. Need to be kept.

[0003]

2. Description of the Related Art FIG. 4 shows a conventional switching control system, in which 1 is a control unit.
Are connected to n controlled units 2-1 to 2-n.

In such a conventional system, the switching request signal SWREQ from each of the controlled units 2-1 to 2-n is received and monitored, and when the switching request signal SWREQ becomes effective. A switching control signal SWT for switching the corresponding controlled unit to, for example, a spare controlled unit 2-n which is another control unit.
The RG is provided to each controlled unit.

Further, as shown in FIG. 4, each controlled unit 2-
In addition to the method of supplying the switching request signal SWREQ to the control unit 1 from 1 to 2-n by the individual signal lines, there is also a method of supplying the switching request signal SWREQ by the polling method using the CPU bus.

[0006]

As described above, in the conventional system, 1 + n signal lines are required for switching 1: n (1 is a spare, n is a current), and 1: 1 switching is required. In the case of an optical system, the number of signal lines required is twice the number of system systems.

Further, in order to perform polling using the CPU bus, the switching time specified by the system cannot be satisfied unless the polling cycle depending on the processing capacity of the CPU is sufficiently short. There was a point.

Therefore, according to the present invention, a plurality of controlled units are connected to one control unit, and the control unit is
In a switching control system for switching a controlled unit at the time of a failure that has generated a switching request signal to another normal controlled unit, an object is to reduce the number of signal lines without using a polling operation using a CPU bus. And

[0009]

FIG. 1 shows the principle of a switching control system according to the present invention. The control unit 1 includes n controlled units 2-1 to 2-n. It is connected.

The control unit 1 is adapted to give a time slot allocation signal to each of the controlled units 2-1 to 2-n, and each controlled unit 2 which has received the time slot allocation signal. In -1 to 2-n, when a time slot assigned to the local station is detected, a switching request signal is sent to the control unit 1 in the time slot.

As described above, according to the present invention, since each unit to be controlled carries the switching request signal in a time division manner and gives it to the control unit 1, only the signal line for the time slot allocation signal and the signal line for the switching request signal are provided. Will be enough.

[0012]

FIG. 2 (a) shows an embodiment of the switching control system according to the present invention, in which three controlled units 2-1 to 2-3 are used. Moreover, FIG.
Clock pulse-1 and timing pulse-2 are used as the time slot allocation signals shown in FIG.

Further, each controlled unit 2-1 to 2-3.
Are n alarm detection circuits (ALMDET) 21-1
21-n and these alarm detection circuits 21-1 and 21-2
Switching request signal SWR in response to the alarm signal from 1-n
Switching request signal generator that generates EQ (SWREQ / GE
N) 22 and the above-mentioned clock pulse-1 and timing pulse-2 and a slot setting signal for setting the time slot of the own station from the MPU (not shown) of the own station, and a time slot signal- Time slot generator 23 for generating 3 and switching request signal generator 2
The AND gate 24 generates a switching request signal to the control unit 1 by receiving the switching request signal SWREQ from the switch 2 and the time slot signal -3 from the time slot generator 23.

The operation of such an embodiment will be described with reference to the time chart shown in FIG. 2 (b). First, the clock pulse -1 and the timing pulse-from the control unit 1 will be described.
2 are simultaneously given to the time slot generator 23 in each controlled unit 2-1 to 2-3.

On the other hand, the time slot generator 23 of each of the controlled units 2-1 to 2-3 receives the slot setting signal from the MPU to generate the time slot allocation signal -3 as shown in FIG. It is given to the gate 24.

At this time, the switching request signal generator 22 which has received the alarm signal from any of the alarm detection circuits 21-1 to 21-n to the AND gate 24 is switched by the switching request signal S.
When WREQ is applied to the AND gate 24, the switching request signal signal for the control unit 1 (this corresponds to the time slot allocation signal -3) is applied.

In the embodiment shown in FIG. 2, the switching request signal SWREQ1 from the controlled unit 2-1 is applied to the control unit 1 as a switching request signal. Therefore, in the embodiment shown in FIG. 2, the control unit 1 determines that a failure has occurred in the active controlled unit 2-1.
Is a controlled unit 2-1 to a spare controlled unit 2-
Switch to 3. The switching mechanism between the controlled units at this time is not particularly shown.

FIG. 3 (a) shows another embodiment of the switching control system according to the present invention. In this embodiment, the active controlled units 2-1W and 2-2W are used. , A pair of spare controlled units 2-1P and 2-2P that are paired with these controlled units are provided respectively, and are applied when performing 1: 1 switching control such as an optical system. It has become so.

Therefore, the terms active and standby are equivalent to each other, and switching from active to standby and switching from standby to active are performed, respectively.

That is, the control unit 1 gives a clock pulse -1 and a timing pulse -2 to each control unit as shown in FIG.
MPU for the time slot generator 23 in 1W-2P
By giving a slot setting signal from the switch, a switching request signal is generated in the time slot of the own station as shown in the figure, and in this embodiment, the active controlled unit-the spare controlled unit The control unit 1 performs switching control so that switching is performed.

The switching request signal shown in FIG. 3 (b) is given two time slots for each controlled unit, and in the case of the SF signal indicating one of them, a duplication such as signal disconnection occurs. In the case of the SD signal, which is the other time slot, a minor fault is indicated, and the control unit 1 notified of these serious faults or minor faults responds to the situation, or It is determined whether or not the switching is performed based on a predetermined condition, and the switching is performed.

In the above embodiment, the time slot generator 23 generates the time slot signal -3 by giving the slot setting signal from the MPU of the local station. A signal can also be given from the control unit 1 as a time slot allocation signal.

[0023]

As described above, according to the switching control system of the present invention, the control unit gives a time slot allocation signal to each controlled unit, and each controlled unit uses its own time slot allocation signal to control its own station. Since the switching request signal is sent to the control unit, it is not necessary to connect the control unit to the controlled unit by an individual signal line, and the number of signal lines can be minimized.

[Brief description of drawings]

FIG. 1 is a block diagram showing in principle the configuration of a switching control system according to the present invention.

FIG. 2 is a block diagram showing an embodiment of the configuration and operation of the switching control system according to the present invention.

FIG. 3 is a block diagram showing another embodiment of the configuration and operation of the switching control system according to the present invention.

FIG. 4 is a block diagram showing a conventional example.

[Explanation of symbols]

1 control unit 2-1 to 2-n Controlled unit   Time slot allocation signal   Switching request signal In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (3)

[Claims] 1. A plurality of controlled units (2-1 to 2-n) are connected to one control unit (1), and the control unit (1) is
In a switching control system for switching from a controlled unit at the time of a failure that has generated a switching request signal to another normal controlled unit, the control unit (1) gives a time slot allocation signal to each controlled unit, A switching control system characterized in that each of the controlled units (2-1 to 2-n) sends a switching request signal of its own station according to the time slot allocation signal. 2. The controlled unit includes a working unit and one spare unit, and the control unit (1) switches from the faulty working unit to the spare unit at the time of the switching. The switching control system according to Item 1. 3. The controlled unit is a pair of a working unit and a standby unit, and at the time of the switching, the control unit (1) switches from the faulty unit to the paired unit. The switching control system according to claim 1.