This paper presents a method for directly controlling a stepper motor with a programmable controller (plc), as shown in Figure 2. The advantage of this technical route is that the workload of the system design is greatly reduced, there is no matching problem of the interface signals of various parts, and the reliability of the system is improved. The entire control system consists of a PLC and a stepper motor. As an industrial control computer PLC, the function is getting stronger and stronger. Not only for switching logic control, but also for closed-loop process control, and can be combined with other computers to form a multi-level control system. With the support of the powerful functions of PLC, the tasks of different command pulse controllers of various control systems can be completed by different control programs of PLC. For the function of the ring pulse distributor and power amplifier, two characteristic requirements are imposed on the PLC. First, the PLC used in this application is preferably a PLC with real-time refresh technology, so that the frequency of the output signal can reach several thousand Hz or higher. The purpose is to enable the ring pulse distribution to have a higher distribution speed, fully utilize the speed response capability of the stepping motor, and improve the rapidity of the entire system. Second, the output port of the PLC itself should use high-power transistors to meet the driving requirements of tens of volts pulse voltage and several ampere pulse current of each phase winding of the stepping motor. It should be pointed out that PLC with relay or thyristor as output port, even if the software ring pulse distribution can achieve high speed requirements, but because the output port device is difficult to turn on and off the DC power at high speed, it can not provide the phase winding of the stepper motor. The pulse current is driven, so it cannot be used for PLC direct control of stepper motors. For PLCs that meet the requirements of one or two, such as the IP1612DC-220 programmable controller of US IPM, direct control of the stepper motor can be performed.
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Figure 2 PLC direct control of stepper motor
The author has successfully used this method in the automatic bagging error compensation system of the ZXJ1000-C prestressed composite bag automatic production line. The system sends the sensor's measured bag length error signal from the PLC's input port, as shown in Figure 3. According to the error and compensation algorithm, the PLC program automatically calculates the number of steering and corner steps that the stepper motor should compensate, and the ring distribution is performed by the ring distribution program through the output ports Y9, Y10, and Y11, so that the control is connected to the stepping motor. The 48V DC power supply of the three-phase winding is turned on and off in sequence to form a rotating magnetic field, so that the stepping motor rotates. The rotation of the stepper motor is superimposed on the main drive train via a mechanical differential to compensate for the bag length error. Since the stepping motor is an inductive load and the DC resistance is small, the current limiting resistor is connected to prevent the pulse current from being too large to damage the PLC port, that is, the high power transistor corresponding to Y9, Y10, and Y11. When the high-power transistors corresponding to Y9, Y10, and Y11 are turned on and off in the following order: Y9-Y9Y10-Y10-Y10Y11-Y11-Y11Y9-Y9..., the stepping motor rotates forward. Press: Y9-Y9Y11-Y11-Y11Y10-Y10-Y10Y9-Y9... When the battery is turned on and off in turn, the stepping motor is reversed. That is, the stepper motor works according to three-phase six-shot. Whenever the stepping motor takes one step, the number of steps of the ring pulse distribution program is decremented by one. When the number of steps is reduced to zero, the ring pulse distribution is stopped, waiting for the input of the next measurement error. 
Figure 3 specific application diagram
Conclusion The error compensation system that directly controls the stepping motor by PLC has perfect functions, high flexibility and high reliability. The production line has won the National Science and Technology Progress Award. The special emphasis is on the method of directly controlling the stepping motor by PLC, which reduces the workload of the system design, can greatly shorten the development cycle, and has a high promotion and practical value within a certain range.
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Description
Wire-to-board connectors are used to interconnect printed circuit boards (PCBs) by using connectors attached to wires.
Specifications
Specifications for a wire to board connector include the following.
Wire-entry angle - There are three wire-entry angle styles: vertical, right-angle, and bottom-entry.
Wire size - Wire size is usually measured in American wire gauge (AWG), a standard for non-ferrous wire conductor sizes. The term "gauge" refers to the wire`s diameter. The higher the gauge number, the smaller the diameter and the thinner the wire.
Circuits or positions - With wire to board connectors, the number of circuits or positions may range from 1 to 120.
Pitch or center spacing - Pitch or center spacing is measured in millimeters (mm) or inches.
Lock to mating style - There are three basic lock-to-mating styles: positive, friction, and friction ramp.
Maximum current - The maximum current or current-carrying capacity is measured in amperes (A) and ranges from 1.0 A to 50. A.
Termination Methods
Crimp is the physical compression of a contact wire around a conductor to make an electrical and mechanical connection. Insulation displacement connectors (IDC) slice through the cable insulation to make a connection. Choices for termination method also include cage clamp, screw, tabs, and solder cups.
PCB Mounting Styles
With wire to board connectors, there are four choices for PCB mounting.
Through-hole technology (THT) mounts components on a PCB by inserting component leads through holes in the board and then soldering the leads in place on the opposite side of the board.
Surface mount technology (SMT) adds components to a PCB by soldering component leads or terminals to the top surface of the board. SMT components have a flat surface that is soldered to a flat pad on the face of the PCB. Typically, the PCB pad is coated with a paste-like formulation of solder and flux.
Press-fit and compression-style Board To Board Connectors are also commonly available.Wire to Board Connectors Information
Standards
Wire-to-board connectors carry approvals from various national and international organizations. In North America, they often bear marks from Underwriters Laboratories (UL) and/or the Canadian Standards Association (CSA).
A wire to board connector for the European marketplace should comply with the Restriction of Hazardous Substances (RoHS) and Waste Electrical and Electronic Equipment (WEEE) directives from the European Union (EU). Wire-to-board connectors that comply with other requirements are also available.
BS 9526 N0001 - Specification for multi-contact edge socket electrical connectors.