Siemens S7 - 200 the introduction of PLC and servo and stepper motor control details overview -

S7- 200, there are two office/PWM generator, to build high-speed pulse sequence ( 美国专利商标局) Or pulse width adjuster ( 脉宽调制) Signal waveform.

when a output configuration for the office operation, generating a 50% duty cycle pulse sequence for stepper motor or servo electrical

in order to simplify the user applications in the use of a control function, STEP7 - - - - - - - Micro/WIN provides a control guide can help you in a few minutes to complete PWM, the office or a control module configuration. The wizard can generate position command, the user can use these instructions in the application provide dynamic control for speed and position.

2, open loop control is used in the basic information of the stepper motor or servo motor

with the help of a wizard control configuration, the output of the office requires the user to provide some basic information, item by item is introduced as follows:

(1) the maximum velocity ( MAX_SPEED) And start/stop speed ( SS_SPEED)

figure 1 is a schematic diagram of the concept of the two.

MAX_SPEED is to allow the maximum operating speed, it should be in the range of motor torque capacity. Driving load required by the friction torque, inertia and acceleration/deceleration time decision. Figure 1

maximum speed and start/stop speed signal

SS_SPEED: numerical should satisfy the motor at low speed when the driving load ability, if SS_SPEED value is too low, when the motion occurs at the beginning and end of the motor and load could swing or vibrate. If SS_SPEED, high electric opportunity lost pulse at startup, trying to stop when they make the motor speed and load. Usually, SS_SPEED value is MAX_SPEED value of 5% to 15%.

2 acceleration and deceleration time acceleration time ACCEL_TIME: motor from the time needed for accelerated to MAX_SPEED SS_SPEED speed. From MAX_SPEED deceleration time DECEL_TIME: motor speed slowed to SS_SPEED need time. Figure 2

acceleration and deceleration time the default of acceleration and deceleration time is 1000 milliseconds. Usually, the motor can work in less than 1000 milliseconds. See figure 2. When these two values set in milliseconds.

note: motor acceleration and stall time to pass the test to determine. In the beginning, you should enter a larger value. Gradually reduce the time value began to stall until the motor, so as to optimize your application of these Settings.

(3) move the envelope

an envelope is a pre-defined mobile description, which includes one or more speed, affects the move from start to finish. An envelope is composed of multiple stage, each section contains a target speed and acceleration/deceleration process running at a constant speed with target speed of a string of a fixed number of pulses. Control wizard provides mobile envelope defined interface, in here, you can move your application to define each envelope. Regarding support maximum 100 envelope.

define an envelope, including the following points: (1) choose operating modes; Each step (2) for the envelope defined metrics. (3) for the envelope defines a symbolic name.

(1) envelope choice of the mode of operation: office in support of the relative position and speed of a single rotation, as shown in figure 3, the relative position mode refers to the movement of the final position from the side began to calculate the starting point of pulse number. Single speed rotation does not need to provide the end position, regarding continues the output pulse, until there are other commands, such as stop hair pulse reach the origin requirements.

figure 3 a envelope operation mode

step 2 envelope of

a step is a fixed distance, workpiece movement including the distance of acceleration and deceleration time. Regarding each envelope maximum allowable 29 step.

each step including target speed and end position or pulse several indexes such as the number. As shown in figure 4 step, two step, three steps and four envelope. Note step envelope only a constant velocity section, two step envelope has two constant velocity section, so on. The number of steps and envelope often speed section number consistent.

figure 4 steps of envelope signal

7. 2. 5 using a control programming guide

STEP7 V4. 0 software of a control guide can automatic processing the office pulse single pipeline and pipeline, the pulse width adjustable

system and create the envelope, SM location configuration.

this section will give an in YL - 335 a implemented on simple tasks, for example, this paper use a wizard control programming methods and steps. YL - in table 1 On the 335 a, step motor running motion envelope as needed. Table 1

step motor running motion envelope

1, the use of a programming guide, complete the following steps: 1)

For S7 - - - - - - - 200 PLC controller selection option configuration regarding/PWM operation.

in STEP7 V4. 0 software command menu, select tools - > S7 - position control wizard and select configuration

buy office within 200 PLC controller/PWM operation, as shown in figure 5.

figure 5 control interface wizard start

2) Click 'next' to choose 'QO. 0 ', then click 'next' to choose 'linear pulse output office) ”。

figure 5 choices regarding or PWM interface

3) Click 'next' after the corresponding input MAX_SPEED and SS_SPEED speed value in the edit box. Input '90000' highest motor speed, the motor start/stop speed setting of '600'. At this time, if you click MIN_SPEED value corresponding grey box, can be found that MIN_SPEED value to 600, note: MIN_SPEED values calculated by the. The user can't other numerical input in this field.

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