The hardware of the microcomputer control system of a welding robot is mainly composed of the interface circuit of the S7-200 PLC microcomputer manipulator and the sensors and motors.
The selection of S7-200 controller module includes: CPU module, I/O module, and D/A module, CPU module can complete complex real-time control functions, its instruction execution time, there are a variety of arithmetic logic operation instructions and PWM operation and other complex instructions, interrupt response, high-speed pulse output and other functions, there are a large number of bit memory, counters and timers, and 8K bytes of EPROM and so on; The I/O module selects transistor port, with opto-decoupled isolation, input and output voltage 24V, contact switching frequency 4KHz; The analog-to-digital conversion time of A/D and D/A modules, resolution 12 bits, input range, output range.
The primary input/output interface of the robot
(1) I/O port
I/O input and inlet, including welding start, stop, reset, welding mode selection and welding car and torch adjustment and other 16 switching inputs, plus pendulum photoelectric sensor switching input, sharing 17 I/O input points.
I/O output, 3 enable and 3 direction outputs of three stepper motors, 2 enable and 2 direction outputs of two DC motors, 4 outputs of power, welding, centering, and fault indicators, a total of 14 I/O outputs.
(2) A/D and D/A ports
A/D inlet, 5 channels of swing amplitude, swing speed, welding speed, left lag time, right delay A/D input, 1 channel center azimuth sensor, front CCD welding car tracking and rear CDD welding torch tracking two photoelectric sensors, a total of 8 channels of A/D output.
At the D/A output port, one D/A output is selected for the frequency modulation control signal of the weld tracking stepper motor, and one D/A output is selected for the control signal of the digital display of the welding speed of welding, and two D/A outputs are used in total.
(3) HSC high-speed counter
The swing detection of the swing stepper motor uses the HSC1 high-speed counter to accurately complete the swing control by detecting the cadence of the stepper motor.
(4) PWM pulse width modulation
The speed regulation of the two DC motors controls the DC motor drive circuit through the PWM high-speed pulse-width modulation signal output by the Q0.0 and Q0.1 of the PLC host, and converts the PWM pulse signal output by the PLC module into an adjustable DC motor drive voltage signal.
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OTC Welding Robot "Three Stability"
1. Stable center of gravity
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2. The welding torch should be stable
Trembling words ...
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52 encoder failure encoder batterycharge low1016
1. Replace the robot ...
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Splash issues
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