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810-801237-021 810-046015-010 Using the pulse output of PLC is a cost effective way to achieve simple motion. Most, if not all, PLC manufacturers offer a way to control servo systems and steppers using pulse train signals. Thus, when a simple machine needs automation on only two or three axes of the electric actuator, the pulse output is easier to set up, wire up, and program than using analog signals. It may also be less costly than using a network such as Ethernet /IP.
So let’s look at how to control a stepper motor or servo system using a driver or amplifier between the controller and the motor, focusing on the pulse signals used by the controller or the stepper.
810-801237-021 810-046015-010 Stepper motor and pulse-controlled servo motor can rotate in both directions. This means that the controller needs to provide at least two control signals to the driver. There are two ways to provide these signals, and they are called different by different manufacturers. There are two common ways to refer to the two control signal modes you are using: “1P mode,” aka “step/direction mode,” and “2P mode,” known as “CW/CCW mode” or clockwise/counterclockwise mode. Both modes require two control signals from the controller to the driver.
810-801237-021 810-046015-010 In 1P mode, a control signal is a pulse train or “step” signal. The other signal is the directional input. If the directional input is on and there is a pulse on the step input, the motor rotates clockwise. Conversely, if the directional signal is off and there is a pulse on the step input, the motor rotates in the other direction, or counterclockwise. No matter what direction is required, the impulse train is always at the same input.
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