CN204287877U - A kind of PLC debugging instrument with dipole inversion function - Google Patents

Abstract

The utility model discloses a PLC debugging instrument with a polarity conversion function, which comprises an input state indication interface, a current source and a voltage source, an output control interface electrically connected to the switch output interface of the PLC, and a current source electrically connected to the PLC The analog input interface of the PLC, the voltage source is electrically connected to the analog output interface of the PLC, and also includes an input polarity conversion unit for converting the polarity of the PLC input port, and is used to control the output of PLC external devices with different polarity requirements COM terminal polarity conversion unit. The utility model not only can satisfy the analog input and output, but also can conveniently provide polarity conversion and analog encoder signal debugging box.

Description

A PLC debugging instrument with polarity conversion function

technical field

The utility model relates to the field of electrical debugging instruments, in particular to a PLC debugging instrument with polarity conversion function.

Background technique

With the development of industrial automation, the application of PLC is more and more extensive. There are two main types of digital input and output signals of PLC: source type and sink type. When the two signals are connected to the PLC, the method of connecting the input or output to the PLC is also different due to the difference in polarity.

In the field of automation, it is necessary to force the input and output in the program to facilitate the debugging of the program. Therefore, the timeliness and operability of forcing the input and output in the program are subject to many restrictions and inconveniences; at the same time, for different peripheral devices, the input or output of the PLC part also needs to control the input power in a source-type and sink-type way. polarity for wiring.

The application of high-speed input, counter and peripheral encoder of PLC itself cannot be carried out without peripheral equipment. The input and output signals of the existing PLC debugger are generally only for one of the source type or the sink type, which cannot meet the needs of using multiple polarity inputs and outputs in the same scheme; there is also no continuously adjusted pulse signal, The control of counters, stepper motors and servo motors cannot be debugged. When applied to the PLC debugging program, some functions still cannot meet the actual requirements. When debugging a program, it is a waste of time and also affects the development progress and debugging cycle of the program.

Utility model content

The purpose of this utility model is to provide a PLC debugging instrument with polarity conversion function, which can satisfy the analog input and output, and at the same time can conveniently provide polarity conversion and analog encoder signals.

The utility model adopts the following technical solutions:

A PLC debugging instrument with a polarity conversion function, used for debugging PLC on-site, including an input status indicating interface that provides switch input signals, analog on-site proximity switches, buttons, selector switches, and switch signals of relay contacts; A current source that provides an analog input signal, an analog signal that simulates on-site temperature, pressure, flow, and motor current; and a voltage source that provides an analog output signal that simulates the analog signal of the PLC-driven actuator and solenoid valve. The output control interface is electrically connected to the switching output interface of the PLC, the current source is electrically connected to the analog input interface of the PLC, and the voltage source is electrically connected to the analog output interface of the PLC. The input polarity conversion unit of the polarity of the PLC input port, the input polarity conversion unit is a double-pole double-throw switch, and the first movable contact in the double-pole double-throw switch is fixedly connected to the cutter head through the input state indication interface It is electrically connected to the switch input interface of the PLC, and the second movable contact is connected to the ICOM port of the PLC; when the first throw position of the double-pole double-throw switch is used, the first movable contact is electrically connected to +24V, and the second movable contact is electrically connected to +24V. The contacts are electrically connected to the ICOM port of the PLC; when the DPDT switch is in the second throw position, the first movable contact is electrically connected to the ICOM port of the PLC, and the second movable contact is electrically connected to +24V.

It also includes an output COM terminal polarity conversion unit for controlling PLC external devices with different polarity requirements.

The output control interface is composed of display lights, and each interface uses two display lights.

The polarity conversion unit of the output COM terminal adopts a single-pole single-throw switch, and there are eight single-pole single-throw switches, which are respectively used for polarity conversion of eight switching value output interfaces of the PLC; wherein the single-pole single-throw switch The static contact is connected to the QCOM terminal of the PLC, the first and second moving contacts of the SPST switch are respectively connected to the two ends of the 24V power supply, and are used to display the status of the PLC switch output interface. The two display lamps are connected in series at both ends of the 24V power supply, and the first display lamp and the second display lamp are electrically connected to the switch output interface of the PLC.

It is characterized in that: it also includes a pulse generation module, the pulse generation module includes a square wave generator and an amplitude adjustment potentiometer arranged at the input state indication interface, the output end of the square wave generator is connected to the amplitude adjustment potentiometer The input terminal and the output terminal of the amplitude adjustment potentiometer are respectively connected to the first and second input ports of the analog quantity of the PLC through the current limiting circuit and the control switch in sequence.

It is characterized in that: the input state indication interface is composed of eight input switches.

The input switch is a dial switch.

In the utility model, an input polarity changeover switch is respectively added at the input port to match the polarity of the PLC input port. In the output, add the polarity conversion unit of the output COM terminal, which is used to connect the common terminal of the power supply with different levels, so as to achieve the purpose of matching the polarity of the PLC output circuit. The debug box that can not only meet the analog input and output, but also conveniently provide polarity conversion and analog encoder signals is an ideal tool to complete these hardware tasks, improve work efficiency, save equipment development cycle, and save upfront costs. Further, the utility model provides a continuously adjustable 0.5Hz-120Hz square wave pulse signal with a duty cycle of 50% by setting a pulse generation module, which is used for debugging counters and simulating external devices with coded pulse feedback. It has a square wave signal, its level is 0-24VDC and its frequency is continuously adjustable from 0.5Hz to 120Hz.

Description of drawings

Fig. 1 is the circuit principle block diagram of the present utility model;

Fig. 2 is the circuit schematic diagram of the polarity conversion of the input terminal described in the utility model;

Fig. 3 is the circuit schematic diagram of output COM terminal sex conversion described in the utility model;

Fig. 4 is a schematic circuit diagram of the pulse generating module of the present invention.

Detailed ways

As shown in Figure 1, a PLC debugging instrument with polarity conversion function is used to debug the PLC on-site, including providing switch input signals, simulating on-site proximity switches, buttons, selection switches, and switching signals of relay contacts The input status indication interface; the current source that provides analog input signals, simulates the analog signals of on-site temperature, pressure, flow, and motor current; and provides analog output signals to simulate the actuators and solenoid valves driven by the PLC. The voltage source of the signal, the output control interface is electrically connected to the switch output interface of the PLC, the current source is electrically connected to the analog input interface of the PLC, and the voltage source is electrically connected to the analog output interface of the PLC. The input polarity conversion unit for converting the polarity of the PLC input port, the input polarity conversion unit is a double-pole double-throw switch, and the first movable contact 1 fixedly connected to the cutter head in the double-pole double-throw switch K1 passes through The input state indication interface is electrically connected with the switch input interface of PLC, and the second movable contact 4 is connected with the ICOM port of PLC; when the first throw position in the double-pole double-throw switch K1, the first movable contact 1 and + 24V electrical connection, the second movable contact 4 is electrically connected to the ICOM port of the PLC; Connect with +24V electricity. The power supply described in the utility model is a +24V power supply.

As shown in Figure 2, K1 is a double-pole double-throw switch. When K1 is placed on the upper end, switches 1 and 2 are connected; The common terminal of the power supply is at 0 potential, so the PLC will get a low potential 0 at the ICOM terminal, if S0 is closed, then it will get a high potential 1 at the I0 terminal, that is, the PLC input high level; on the contrary, put the switch K1 at the lower end, PLC will get input low level. Input polarity inversion (i.e., in place of source and sink switches) is easily accomplished.

It also includes an output COM terminal polarity conversion unit for controlling PLC external devices with different polarity requirements. As shown in Figure 3, it is the principle of polarity conversion of the output COM terminal. Among them, K2 is a single-pole double-throw switch. Since the output terminal of the PLC is isolated, in the transistor output circuit, when it is in the output state, it is to conduct a forward conduction of a PN junction inside the PLC. The polarity here is relative to the forward conduction of the PN junction, which is divided into NPN (Negative-Positive-Negative) mode and PNP (Positive-Negative-Positive) mode. The polarity conversion of the output COM terminal of the utility model is to change the voltage at both ends of the PN junction by switching the switch K2, thereby realizing switching the current flow direction in the peripheral circuit where the PN junction is located, that is, switching the polarity of the power supply.

Since the polarity of the power supply needs to be switched, the output control interface of the utility model is composed of display lights, and each interface uses two display lights, so that the testers can be accurately indicated with different polarity states.

The polarity conversion unit of the output COM terminal adopts a single-pole single-throw switch, and there are eight single-pole single-throw switches, which are respectively used for polarity conversion of the eight switching value output interfaces of the PLC; since the eight switching value output The connection mode of the interface is the same, and the following is only an example of a digital output interface Q0 for illustration: As shown in Figure 3, the static contact 11 of the first SPST switch is connected to the QCOM terminal of the PLC, and the static contact 11 of the first SPST switch The first movable contact 12 and the second movable contact 13 are respectively connected to the two ends of the 24V power supply, and the first display lamp LED1 and the second display LED2 lights for displaying the status of the PLC switch output interface are connected in series at both ends of the 24V power supply. The first display light LED1 and the second display light LED2 are electrically connected to the first switch output interface Q0 of the PLC.

Also includes a pulse generation module, the pulse generation module includes a square wave generator and an amplitude adjustment potentiometer arranged at the input status indication interface, the output end of the square wave generator is connected to the input end of the amplitude adjustment potentiometer, and the amplitude The output end of the adjustment potentiometer is respectively connected with the first and second input ports of the analog quantity of the PLC through the current limiting circuit and the control switch in sequence.

As shown in Figure 4, the square wave generator described in the utility model is composed of a 120Hz pulse source through an oscillating circuit. This is an existing product, and its internal structure will not be introduced in detail; its oscillating frequency is continuously adjustable from 0.5Hz to 120Hz , the duty cycle is 50%, the square wave pulse signal with an amplitude of 24V, after the amplitude is changed by the amplitude adjustment potentiometer, the amplitude becomes adjustable from 0 to 24V, and its output is divided into two channels through the two switches S10 and S11 respectively External output, wherein the circuit is provided with a current-limiting resistor, the specific current-limiting resistor R1 is connected to the second input port I0 of the PLC through the switch S10, and the current-limiting resistor R2 is connected to the first input port I1 of the PLC through the switch S11. Wherein, when the dial switch S0 and the dial switch S1 of the eight-bit input switch are turned off, turn on the switch S10 at this time, and a square wave pulse will be input at the second input port I0; One input port I1 inputs a square wave pulse, and the utility model can also turn on the switches S10 and S11 at the same time, and input two identical square wave pulses at the input ports I0 and I1 at the same time. The square wave frequency of the square wave generator in the utility model can be adjusted. When the frequency is low, the counter can be debugged, and the counting state can be seen; when the frequency is high, pulse control controllers such as stepping drivers and servo drivers can be debugged. , At the same time, it can also simulate the square wave waveform output by the encoder, which expands the function of the debugger and improves the practicability and convenience of the instrument.

The input state indication interface is composed of eight input switches. The input switch is a dial switch.

It should be noted that the above specific examples only express the implementation manner of the utility model, and should not be understood as a limitation of the patent scope of the utility model. The protection scope of the present utility model should be defined by the claims and their equivalents.

In addition to providing most of the signal sources in the PLC debugging process, the utility model can also directly supply power to PLCs whose power level is 24VDC. Simplify the problem of using PLC power supply. In summary, this instrument has the following advantages compared with the existing PLC debugger:

1. The input polarity conversion switch can easily make the PLC input source type or sink type (reverse polarity) switch state, and has input high and low level indicators to indicate the switch state.

2. Output status, with high and low level indicators. The output COM terminal polarity conversion unit can change the polarity of the PLC output terminal, which is used to test the connection between the PLC and the peripheral equipment in different polarity states. When testing the color loss, the encoder information is used for debugging the polarity of the dam foundation input power supply. In the debugging program,

3. Output 0.5Hz ~ 120Hz continuously adjustable square wave pulse signal with a duty cycle of 50%. And through the switches S10, S11, connected to the two input ports I0, I1 of the PLC, which is convenient for pulse input during debugging.

4. In addition, the utility model also has two kinds of analog output, 0-10V continuously adjustable analog voltage generated by the voltage source and 0-20mA continuously adjustable analog current generated by the current source. All of the above are used for the test of PLC analog quantity.

The utility model solves the following deficiencies of other debuggers. Firstly, the input state polarity conversion switch is added to the input, which solves the problem of different polarity switches of the PLC input source type and sink type; secondly, the output COM terminal polarity conversion unit is added, which solves the problem of different polarity switches when connecting PLC external devices. The problem of polarity; third, it provides a continuously adjustable pulse signal from 0.5Hz to 120Hz, and realizes special functions such as debugging PLC counters, stepping drivers, servo drivers and analog encoders. At the same time, the utility model also realizes the continuous adjustment of level signals of different levels between 5V and 24V input by the encoder.

Claims (7)

1. A PLC debugging instrument with polarity conversion function, used for debugging PLC on-site, including providing switch input signals, analog on-site proximity switches, buttons, selection switches, and relay contact input state indications for switching signals Interface; current source providing analog input signal, simulating on-site temperature, pressure, flow, and analog signal of motor current; and providing analog output signal, simulating the voltage source of the analog signal of the PLC-driven actuator and solenoid valve , the output control interface is electrically connected to the switching output interface of the PLC, the current source is electrically connected to the analog input interface of the PLC, and the voltage source is electrically connected to the analog output interface of the PLC. It is characterized in that: it also includes a useful The input polarity conversion unit for converting the polarity of the PLC input port, the input polarity conversion unit is a double-pole double-throw switch, and the first movable contact fixedly connected to the cutter head in the double-pole double-throw switch passes the input state The indication interface is electrically connected to the switch input interface of the PLC, and the second movable contact is connected to the ICOM port of the PLC; when the first throw position of the double-pole double-throw switch is used, the first movable contact is electrically connected to +24V, and the second movable contact is electrically connected to +24V. The two moving contacts are electrically connected to the ICOM port of the PLC; when the DPDT switch is in the second throw position, the first moving contact is electrically connected to the ICOM port of the PLC, and the second moving contact is electrically connected to +24V. 2. The PLC debugger according to claim 1, further comprising an output COM terminal polarity conversion unit for controlling PLC external devices with different polarity requirements. 3. The PLC debugger according to claim 2, characterized in that: said output control interface consists of display lights, and each interface uses two display lights. 4. PLC debugging instrument according to claim 3, it is characterized in that: described output COM terminal polarity conversion unit adopts single pole single throw switch, and described single pole single throw switch is provided with eight, is respectively used for to PLC Eight switching output interfaces are used for polarity conversion; the static contact of the SPST switch is connected to the QCOM terminal of the PLC, and the first and second moving contacts of the SPST switch are respectively connected to both ends of the 24V power supply. And the first display lamp and the second display lamp used to display the status of the PLC switch output interface are connected in series at both ends of the 24V power supply, and the first display lamp and the second display lamp are electrically connected to the switch output interface of the PLC. 5. according to the described PLC debugger of claim 1-4 arbitrary claim, it is characterized in that: also comprise pulse generation module, described pulse generation module comprises the square wave generator that is arranged on input state indicator interface place and amplitude Adjust the potentiometer, the output end of the square wave generator is connected to the input end of the amplitude adjustment potentiometer, and the output end of the amplitude adjustment potentiometer respectively passes through the current limiting circuit and the control switch and the first and second inputs of the analog quantity of the PLC ports are connected. 6. The PLC debugger according to claim 5, characterized in that: said input status indication interface is composed of eight input switches. 7. The PLC debugger according to claim 6, characterized in that: said input switch is a dial switch.