JPS59110230A - Interframe signal monitoring system - Google Patents

Abstract

PURPOSE:To find trouble speedily by generating a warning by a reception-side error detecting circuit in response to the breaking of a mounting information signal when a transmission part is mounted. CONSTITUTION:The mounting information line 9 is provided between a transmitting frame 1' and a receiving frame 2', and the line 9 is released when a transmission part 3' is mounted on the side of the transmitting frame 1' or grounded when not. The output of the line 9 is ANDed by the AND circuit 11 in the receiving frame 2' with the output of a mounting information line 8 after passing through an inverter 10, and the result is supplied to the error detecting circuit 6. When the transmission part 3' is mounted and a signal line 7 and the mounting information lines 8 and 9 are normal, the output of the circuit 11 is at a level L, and when abnormal, the output is also at the level L, so that the circuit 6 generate a warning.

Description

Detailed Description of the Invention (a) Technical Field of the Invention The present invention detects an abnormality in a signal between a transmitting unit equipped with a transmitting unit and a receiving frame equipped with a receiving unit. If the transmitter is not installed, the error detection circuit of the rack detects it and issues an alarm, and if the transmitter is not installed, it is ff. The present invention relates to an interframe signal monitoring system in which an error detection circuit issues an alarm if there is an abnormality in the signal, including a disconnection of the signal line, even if the mounting information line for prohibition is disconnected.

(b) Prior Art and Problems FIG. 1 is a block diagram showing the circuit configuration of a conventional interframe signal monitoring system.

In the figure, 1 is a transmitter, 2 is a receiving rack, 3 is a transmitter, 4 is a driver, 5 is a receiver, 6 is an error detection circuit, 7 is a signal line,
8 is a mounting information line, and R3 is a resistor.

In FIG. 1, the driver 4 of the transmitter 3 of the transmitter 1 and the signal!
An error detection circuit 6 monitors the abnormality of the digital signal transmitted to the receiver 5 of the receiving section 2 via the receiver 7 by a method such as a parity check, and issues an alarm if there is an abnormality. In such a case, if the transmitter 3 is not installed, the mounting information &18 is used to prevent the alarm from being issued.The transmitter 1 side is open when the transmitter 3 is not installed, and is grounded when it is installed, and the receiver 2 side is Connected to the error detection circuit 6, and a resistor R is connected to this connection.
+5v is supplied via 3. By doing this, when the transmitter 3 is not mounted, the input part of the mounting information line 8 to the detection circuit 6 will be at the FiH level, and even if there is no signal from the transmitter 1 side and there is an abnormality, an erroneous signal will be detected. The detection circuit 6 does not issue an alarm. Naturally, if the transmitter 3 is mounted, the mounting information line 8 is grounded and the input to the error p detection circuit 6 is at L level, so if there is an abnormality in the digital signal transmitted from the transmitter 3, the error detection circuit 6 detects an abnormality and issues an alarm. However, in this circuit, when the transmitter 3 is mounted, if there is an abnormality in the signal including a disconnection of the signal line 7 and an alarm must be issued, the error detection circuit 6 Since the input of the mounting information line 8 is at H level, there is a drawback that no alarm is issued and failures cannot be discovered quickly. The reason why the disconnection of the signal line 7 is regarded as a signal abnormality is that when the mounting information line 8 is disconnected, the signal f5!7 is often disconnected at the same time.

(e) Purpose of the Invention In view of the above-mentioned drawbacks, the purpose of the present invention is to prevent the error 9 detection circuit from being removed even if the mounted information line is disconnected when the transmitter is mounted, if the signal becomes abnormal including the disconnection of the signal line. The purpose of the present invention is to provide a system for monitoring signals between frames that issues an alarm.

(d) Structure of the Invention In order to achieve the above object, the present invention detects an abnormality in a signal between a transmitting section in which a transmitting section is mounted and a receiving frame in which a receiving section is mounted.
If the transmitter is installed, the error detection circuit of the receiver detects it and issues an alarm, and if the transmitter is not installed, the device prohibits the generation of an alarm. 1st
．． A second mounting information line is installed on each transmitting rack so that it is grounded and open when the transmitter is mounted, and open and grounded when it is not mounted, and on the receiving rack side, it is connected to the first mounting information line. The information line is connected to a first input of the AND circuit, and the second implementation information line is connected to a second input of the single-AND circuit via an inverter circuit, and the second implementation information line is connected to the first input and the input of the inverter. is given an H level, and the output of the AND circuit is connected to an error detection circuit, and when one or both of the transmissions result in co-analysis, it is set to an L level, and when the output of the AND circuit is at an L level, the error detection circuit is connected to the error detection circuit. It is characterized in that it issues an alarm when the detection circuit detects an error.

(e) Embodiment of the Invention An embodiment of the invention will be described below with reference to the drawings. FIG. 2 is a block diagram of a circuit for an interframe signal monitoring system according to an embodiment of the invention.

Components in the figure that have the same functions as those in FIG. 1 are indicated by the same symbols.

1' is a transmitter, 2' is a receiver, 3' is a transmitter, 9 is a mounting information line, 10 is an inverter, 11 is an AND circuit, and R3 is a resistor.

The difference between FIG. 2 and FIG. 1 is that a mounting information line 9 is provided, and on the transmitter 1' side, it is open when the transmitter 3' is mounted and grounded when it is not mounted. Also, the receiving section 2'
Here, the input of the newly provided AND circuit 110 is connected together with the mounting information line 8 via the inverter 10, and the output of the AND circuit 11 is connected to the error detection circuit 6. Note that +5 is connected to the input of the AND circuit 11 of the mounting information line 8 and the input of the inverter 10 of the mounting information 11i19 through a resistor RHR11.
v is applied. By doing this, the output of the CAND circuit 11 is at H level when the transmitting section 3' is not installed, and the error detection circuit 6 does not issue an alarm, but the output of the transmitting section 3'
' is mounted and if the signal line 7 mounting information lines 8 and 9 are normal, the output of the AND circuit 11 is L level. Alternatively, even if one of them is disconnected, the output of the AND circuit 11 is at L level, so if the signal becomes abnormal including the disconnection of the signal line 7, the error detection circuit 6 issues an alarm. Therefore, even if the mounting information lines 8 and 9 are disconnected, if there is an abnormality in the signal, an alarm is issued, so that the fault can be discovered quickly.

(f) Effects of the Invention As explained in detail above, according to the present invention, even if the mounted information line is disconnected when the transmitter is mounted, if there is an abnormality in the signal including a disconnection of the signal line, the error detection circuit on the receiving side will be activated. Since this system issues an alarm, it has the effect of allowing troubles to be discovered quickly.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the circuit configuration of a conventional hoist signal monitoring system, and FIG. 2 is a block diagram showing the circuit configuration of a hoist signal monitoring system according to an embodiment of the present invention. ' is a transmitter, 2 and 2' are a receiving rack, 3°3' is a transmitter, 4 is a driver, 5 is a receiver, 6 is an error detection circuit, 7tj is a signal line, 8 and 9 are mounting information lines, 10 is an inverter, 11 is an AND circuit, Ro. R2 indicates resistance.

Claims (1)

[Claims] If a transmitting unit is installed, the error detection circuit of the receiving rack detects an abnormality in the signal between the transmitting unit that is equipped with the transmitting unit and the receiving rack that is equipped with the receiving unit, and an alarm is issued. In a device that prohibits the generation of an alarm if the transmitter is not installed, the first and second mounting information lines are installed between the transmitter and receiver racks, and each transmitter is grounded if the transmitter is installed. and open, and if it is not mounted, it is open and grounded, and on the receiving rack side, the first mounting is connected to the information line, the first input of the AND circuit, and the input of the inverter is set to H level. The output of the AND circuit is connected to an error detection circuit, and when the transmitter is not installed, the output of the AND circuit is set to H level, and when the transmitter is installed and the first . When one or both of the second mounting information lines are eutectoid, the level is set to L level, and when the output of the AND circuit is L level and the false alarm detection circuit detects an false alarm, an alarm is issued. A system for monitoring signals between frames.