JPH03296398A - Analog signal transmission system - Google Patents

Abstract

PURPOSE:To simplify the circuit constitution by sending a clock signal and an enable signal from a master set, sending the enable signal sequentially from a 1st stage slave set till a final stage slave set and allowing each slave set to send an analog signal to the master set in response to the input enable signal. CONSTITUTION:An analog sensor controller 1 being a master set is provided with a clock generating circuit 6, an enable signal generating circuit 8, and a signal processing circuit 10 fetching an analog signal of a laser displacement meter 2 being a slave set and applying signal processing. The slave set 2 is provided with an analog signal output circuit 22 connecting the analog signal to a transmission line l and an enable sequential transmission circuit 21 outputting the enable signal for sequential transmission at the trailing of the enable signal to be inputted synchronized with the clock signal, the 1st stage slave set fetches the clock signal from the master set and fetches the enable signal and slave sets at the 2nd and succeeding stages fetch enable signal outputted from the preceding stage of slave set and the analog signal outputted from each slave set is sent to the master set 1 sequentially through the transmission signal line l and the slave set of the preceding stage.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an analog signal transmission system used in a combination of a laser displacement meter and an analog sensor controller.

[Prior art] Conventionally, an analog signal output from a laser displacement meter 2, which is a child device, is transmitted to an analog sensor controller, which is a parent device, and
For example, it is possible to measure the thickness of an object to be detected by adding analog signals output from two laser displacement meters, or to measure the level difference in an object by subtracting them over multiple measurement points. There is an inspection device that comprehensively inspects the object to be detected.In this device, a laser displacement meter is connected to an analog sensor controller.
As an analog signal transmission system adopted for transmitting analog signals, for example, as shown in Fig. 3, an individual transmission signal line l is connected to each laser displacement meter 2 and an analog signal is transmitted separately to each laser displacement meter 2. There is a system.

In this system, there was a problem that the number of wires was large, making the wiring construction complicated6.Therefore, the system shown in Fig. 4 was proposed. After setting the address, the analog sensor controller 1 transmits the predetermined address via the address bus 3, and the laser displacement meter 2 outputs the address set in the address setting port N4 and the received address as an address. When a match is detected by the circuit 5, a switch means S such as an analog switch is turned on and an analog signal outputted from the analog signal output circuit 6 is sent to the transmission signal line l.

In the system shown in Fig. 4 above, the wiring is an address bus 3 for sending an address signal from the analog sensor controller l to the laser displacement meter 2, and a transmission signal line l for transmitting an analog signal from the laser displacement meter 2 to the analog sensor controller l. Therefore, the wiring workability is improved compared to the conventional example shown in FIG. 3 above.

[Problems to be Solved by the Invention] However, the system shown in FIG. Laser displacement meter 2 that requires troublesome settings and can be connected
The number of connections is determined by the number of lines of the address bus 3, so there is a problem that there is a limit to the number of connections.

The present invention has been made in view of the above-mentioned points, and its objectives are to facilitate wiring construction, to simplify the circuit configuration of the slave unit, to eliminate the need for address setting, and to connect connectors. An object of the present invention is to provide an analog signal transmission system that has no restrictions on the number of devices and allows easy miniaturization of slave devices.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention includes a slave unit that outputs an analog signal, and a master unit that takes in the analog signal output from each slave unit and processes the signal. In an analog signal transmission system, the base unit has the function of outputting a clock signal, generating an enable signal, and receiving the analog signal of the slave unit transmitted via the transmission signal line, and the slave unit has the function of outputting the clock signal and generating an enable signal. tl! to the transmission signal line through the switch means. The device is equipped with an analog signal output circuit connected to the main device, and an enable sequential feed circuit that outputs an enable signal for sequential feed at the falling edge of the input enable signal synchronized with the clock signal, and the first-stage child device receives the clock signal from the parent device. and captures the enable signal with 2
The slave units in the subsequent stages receive the clock signal through the slave unit in the previous stage, as well as the enable signal output from the slave unit in the previous stage, and the analog signals output from each slave unit are transmitted through the transmission signal line and the slave unit in the previous stage. The information is transmitted to the base unit sequentially through the following channels.

(Function) According to the present invention, by simply sending a clock signal and this enable signal from the base unit, the enable signal is sequentially sent from the first-stage slave unit to the last-stage slave unit, and each slave unit receives the enable signal. The analog signal can be transmitted to the base unit via the transmission signal line in response to the input enable signal on the machine.Therefore, the slave machine requires the effort of setting the address, the address setting circuit for that purpose, and the need for address matching detection. This eliminates the need for additional circuitry, simplifies the circuit configuration, and there is no restriction on the number of slave devices that can be connected.

In addition, since the wiring consists of three wires: a clock signal line, an enable signal line, and a transmission signal line, wiring construction is easier, and the number of crossover wires from one slave unit to another is reduced, making it easier to connect connectors. A small device can be used, and the entire slave unit can be made smaller.

[Example code] The present invention will be explained below with reference to Examples.

FIG. 1 shows the circuit configuration of an embodiment of the present invention.
a clock generation circuit 6 that outputs a clock signal shown in FIG.
An output terminal 7 for that purpose, an enable signal generation circuit 8 that generates an enable signal, an output terminal 9 for that purpose, and an analog signal from the laser displacement meter 2, which is a slave unit, that is transmitted via the transmission signal line l. a signal processing circuit 10 that performs signal processing, and an analog signal input terminal 11 therefor;
The 6-laser displacement meter 2 has an output terminal 7.9 and an input terminal 11 provided in one connector 12, an input terminal 13 for inputting a clock signal, an input terminal 14 for an enable signal, and an input terminal 14 for a transmission signal. Connection terminal 15 for connecting line l
an output terminal 17 that is connected to the input terminal 13 through internal wiring to send out a clock signal to a subsequent stage; an output terminal 18 that sends out an enable signal for forwarding to a subsequent stage; and the connection terminal 15. It has a second connector 20 consisting of a connecting terminal 19 which is connected through internal wiring to connect a transmission signal line l from a subsequent stage, and also connects an analog signal to a switching means S such as an analog switch and a connecting terminal 15. During the input period of the enable signal taken in from the input terminal 14 - the input terminal 1
3 outputs a switch signal for turning on the switch means S in synchronization with the tarok signal from 3, and sends a sequential enable signal to the output terminal 18 at the falling edge of the input enable signal.

Thus, the first-stage laser displacement meter 2 connects the input terminal 13 of the connector 16 to the output terminal 7 of the connector 12 of the analog sensor controller 1 through the clock signal line 11, and connects the input terminal 14 to the output terminal 9. is connected to the input terminal 11 through the enable signal line 12, and the connection terminal 15 is connected to the input terminal 11 through the transmission signal line I.The clock signal from the analog sensor controller 1 is inputted, and the enable signal is inputted, and the analog signal is transmitted to the analog sensor controller 1.

The laser displacement gauges 2 in the second and subsequent stages connect the clock signal line 1 to the output terminal 17 of the connector 20 of the laser displacement gauge 2 in the previous stage.
1 to the input terminal 13 of the connector 16, and likewise the input terminal 14 to the output terminal 18 through the enable signal line 12.
connection terminal 1 to connection terminal 19.
5 are connected via a transmission signal line l. In this way, the clock signal from analog sensor controller 1 is a clock signal! The signal is sent to each laser displacement meter 2 through f1 and the wiring within each laser displacement meter 2.

Now, the enable signal shown in FIG. 2(b) having a width from the falling edge of the clock signal before the clock signal ■ shown in FIG. When sent to the laser displacement meter 2, the enable forwarding circuit 21 of the laser displacement meter 2
Now, as shown in FIG. 2(C), a switch signal synchronized with the clock signal ■ is applied to the switch means S to turn it on, and the analog signal from the analog signal output circuit 22 is sent out from the connection terminal 15 through the internal wiring. The signal will be transmitted to the input terminal 11 of the analog senna controller 1 through the transmission signal line l.

Furthermore, when the input enable signal rises, the enable sequential feed circuit 21 generates a sequential feed enable signal shown in FIG. , and is sent to the second stage laser displacement meter 2. This second-stage laser displacement meter 2 operates in the same manner as the first-stage laser displacement meter 2, and generates the switch signal shown in FIG. 2(e) from the enable forwarding circuit 21 to turn on the switch means S. Analog signal from analog signal output circuit 22 and output terminal 15
This analog signal is sent to the previous stage laser displacement meter 2.
The signal is sent to the analog sensor controller 1 through the transmission signal line 1 to the front stage laser displacement meter 2, and further through the transmission signal line 1 to the analog sensor controller 1. Then, as shown in FIG. 2(f), the enable sequential feed circuit of the third stage laser displacement meter sends an enable signal for sequential feeding from the enable sequential feed circuit 21 to the third stage laser displacement meter (not shown). Also, the switch signal shown in Fig. 2 (g) is generated in synchronization with the clock signal ■, and the switch signal shown in Fig. 2 (h) is generated.
Generates the sequential feed enable signal shown in .

If the fourth stage laser displacement meter is not connected, the analog signal corresponding to the clock signal ■ will not be transmitted to the analog sensor controller 1, so the analog sensor controller 1 It is determined that the total number of units 2 is three, and the enable signal is sent to the first-stage laser displacement meter 2 as the clock signal following the clock signal (2) as the clock signal (2). Thereafter, the generation timing of the enable signal is matched to the three laser displacement meters 2.

In the above embodiment, the system uses the laser displacement meter 2 as a child device and the analog sensor controller 1 as a main device, but the present invention can be applied to other devices that transmit analog signals, such as pressure sensors. It can also be used for signal transmission of analog photoelectric sensors, etc.

[Effect of the invention] The present invention outputs a clock signal and generates an enable signal in an analog signal transmission system,
The base unit is equipped with a function to capture the analog signal of the slave unit transmitted via the transmission signal line, and the slave unit has an analog signal output circuit that connects the analog signal to the transmission signal line via a switch means, and a clock signal. It is equipped with an enable sequential feed circuit that outputs an enable signal for sequential feed at the falling edge of the input enable signal synchronized with The slave unit receives the clock signal through the previous slave unit, and also captures the enable signal output from the previous slave unit, and the analog signal output from each slave unit is transmitted sequentially through the transmission signal line and the previous slave unit. Since the clock signal and enable signal are sent from the base unit, the enable signal is sent sequentially from the first slave unit to the last slave unit, and the input signal is sent to each slave unit. It is possible to transmit an analog signal to the base unit via the transmission signal line in response to an enable signal, so there is no need to learn how to set an address on the slave unit. Since there is no need for a circuit to perform this, the circuit configuration is simple, and since addresses are not set, there is no restriction on the number of slave units connected, and the wiring requires clock signal lines, enable signal lines, Since there are only 3 transmission signal lines, wiring construction is easier, and the number of crossover wires from one slave unit to another is reduced, so a small connector can be used for connection, and as a result, the entire slave unit is This has the effect of making it more compact.

[Brief explanation of the drawing]

FIG. 1 is a partially omitted circuit configuration diagram of an embodiment of the present invention, FIG. 2 is a time chart for explaining the same operation, and FIGS.
Each figure is a circuit configuration diagram of a conventional example. 1 is an analog senna controller, 2 is a laser displacement meter,
6 is a clock generation circuit, 8 is an enable signal generation circuit,
10 is a signal processing circuit, 21 is an enable forwarding circuit, 2
2 is an analog signal output circuit, S is a switch means, l is a transmission signal line, 11 is a clock signal line, and 12 is an enable signal line. Figure 4Figure 3

Claims (1)

[Claims] (1) In an analog signal transmission system consisting of a slave device that outputs an analog signal and a master device that takes in the analog signal output from each slave device and processes the signal, it outputs a clock signal and also outputs an enable signal. The base unit is equipped with a function to take in the analog signal of the slave unit that is generated and transmitted via the transmission signal line, and the slave unit has an analog signal output circuit that connects the analog signal to the transmission signal line via a switch means. , and an enable sequential feed circuit that outputs an enable signal for sequential feed at the falling edge of an input enable signal synchronized with a clock signal, and the slave device at the first stage takes in the clock signal from the parent device and also takes in the enable signal, and 2. The slave units in the subsequent stages receive the clock signal through the slave unit in the previous stage, as well as the enable signal output from the slave unit in the previous stage, and the analog signals output from each slave unit are sent to the transmission signal line and the slave unit in the previous stage. An analog signal transmission system characterized by sequentially transmitting signals to a base unit.