JP3216229B2 - Signal multiplex transmission equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal multiplex transmission apparatus for controlling signals of a magnet switch (MgSW) for controlling on / off of a motor, a pump and the like.

[0002]

2. Description of the Related Art It is desired that the operation state of a load can be easily selected in the event that an abnormality occurs in the control of a motor, a pump, etc. by MgSw. For example, in the case of a cooling pump or the like, continuous operation is fail-safe for a running one, but a stop side is desirable for a motor or the like. Also, when controlling with a remote processor such as MgSW,
The control output can be handled by one control signal such as operation / stop of the load, not by control of the on / off switch (SW), which makes it easy to think in the creation of software programs and the like.

[0003]

However, conventionally, the operation state of the load cannot be selected and is fixed.

It is an object of the present invention to provide a signal multiplex transmission apparatus which solves the above problems.

[0005]

According to the present invention, there is provided a signal multiplex transmission apparatus for controlling a load by receiving a transmission signal via a common signal line, wherein the transmission signal changes from OFF to ON. A first output circuit that closes a first output terminal for a certain period of time, a second output terminal that closes during operation, and a third output terminal that opens during operation, only when the transmission signal changes from ON to OFF. Operate or not operate for a certain period of time, otherwise reverse
A second output circuit having two modes; and a circuit for selecting one of the two modes of the second output circuit.

[0006]

According to the present invention, the load operation state at the time of abnormality can be selected. As a result, it is possible to select an operation mode according to the type of load, and to easily think of control software such as a processor.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing a signal multiplex transmission unit according to an embodiment of the present invention. Reference numeral 11 denotes a signal multiplex transmission unit, which has terminals for an interface unit 8, a CPU 9, an output mode setting circuit 10, and output relays Ry1, Ry2, 1 to 7. 1 to 5 are control output terminals, 6 and 7 are signal input terminals, 1 to 3 are outputs 2, and 4 and 5 are outputs 1.
The input terminals 1 and 2 are closed when the relay Ry2 is not excited, the input terminals 1 and 3 are closed when the relay Ry2 is excited, and the input terminals 4 and 5 are open when the relay Ry1 is not excited. The signal on the signal line is interfaced by the interface unit 8, read by the CPU 9, and turned on / off of the signal.
When turned off, output relays Ry1 and Ry2 are turned on as shown in FIG.
/ OFF control. The output mode setting circuit 10 generally selects an output mode by a switch (SW) or the like, and according to this setting, the relay Ry2 is always energized when the power of the transmission unit is turned on, or is always energized (however, FIG. Thus, the reverse operation is performed only when the transmission signal is OFF. The input terminals 6 and 7 are provided with an answerback signal from the load (that is, for example, MgS as shown in FIGS. 2 and 3 described later).
This is a terminal for reading (a signal indicating whether or not W is operating normally).

FIG. 4 shows a time chart of the operation of the outputs 1 and 2, and FIGS.

FIG. 2 shows that when the transmission unit is turned off,
An example is shown in which the MgSW retains the previous operation state (the output mode setting circuit 10 selects the constant non-excitation of the Ry2), and an AC power supply for MgSW operation is connected between the terminals 1 and 5, and the MgSW is connected. Terminals (ON when energized) are connected to terminals 4 and 5.
It is connected between. MgSW between terminals 6 and 7
M to connect the answer back signal to confirm the operation of
Connect another contact of gSW (ON at excitation). According to the above configuration, when the transmission signal is turned on on the signal line after the power supply of the present transmission unit is turned on, the terminals 4 and 5 are closed.
Since the terminals 1 and 2 are closed, the MgSW is turned on (operates), and the contact between the terminals 4 and 5 is closed and held by itself (the answerback signal is ON). Thereafter, even if the power of the transmission unit is turned off, the terminals 1 and 2 are closed and the terminals 4 and 5 are closed by the MgSW contacts.
Keeps the previous operating state. When the transmission signal on the signal line is turned off, the terminals 1 and 2 are opened, the MgSW is not excited, and the terminals 4 and 5 are opened.

On the other hand, FIG. 3 shows that the power of the transmission unit is turned off.
An example in which the MgSW is sometimes turned off is shown (the output mode setting circuit 10 selects the constant excitation of the Ry2). The difference from FIG. 2 is that the MgSW is connected between the terminals 3 and 4. In this case, when the transmission signal is turned on on the signal line, the terminals 4 and 5 are closed, and the terminals 1 and 3 are closed at that time, so that the MgSW is excited. After that, when the power of the transmission unit is turned off, Ry2 is de-energized,
Since terminals 1 and 3 are open, MgSW is not excited (OFF)
Becomes

[0012]

As described above, according to the present invention, it is possible to select an operating state at the time of abnormality according to the load.
For this reason, the concept of control of the software of the host or the like is facilitated, and it is not necessary to prepare transmission units having different output specifications, so that inventory management can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a diagram showing a first connection example of the embodiment.

FIG. 3 is a diagram showing a second connection example of the embodiment.

FIG. 4 is a diagram showing an operation time chart of the embodiment.

[Explanation of symbols]

 1 to 7 terminal 10 output mode setting circuit 11 signal multiplex transmission unit Ry1, Ry2 relay MgSW magnet switch

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04Q 9/00-9/16 G08C 15/00

Claims (1)

(57) [Claims] 1. A signal multiplexing transmission apparatus for receiving a transmission signal via a common signal line and controlling a load, wherein a first output terminal for closing a first output terminal for a predetermined time when the transmission signal changes from OFF to ON. It has an output circuit, a second output terminal that is closed during operation, and a third output terminal that is open during operation, and operates or not operates for a fixed time only when the transmission signal changes from ON to OFF. A signal multiplex transmission apparatus comprising: a second output circuit having two modes in opposite states; and a circuit for selecting one of the two modes of the second output circuit.