Siemens S7-200PLC is an ultra-compact PLC, which is suitable for automatic detection, monitoring and control in various industries and in various occasions. The powerful features of the S7-200PIE enable complex control functions to be implemented in either stand-alone or connected networks.
1 working principle
The robot presses the start button when the workpiece is detected at the home position. Drop the solenoid valve to energize. The robot is lowered. When it falls to the end. Hit the lower limit switch. The falling solenoid valve is de-energized, and the lowering stops: the clamping solenoid valve is simultaneously turned on. The robot is clamped. After clamping. The rising solenoid valve is energized. The robot is rising. When it rises to the top, it hits the upper limit switch. The rising solenoid valve is de-energized. Rise and stop; simultaneously turn on the right shift solenoid valve. When the robot moves to the right, it touches the right limit switch, the right shift solenoid valve is powered off, and the right shift stops. If there is no workpiece on the right table at this time. Then the photoelectric switch is turned on. The drop solenoid valve is energized and the manipulator is lowered. When it falls to the end. When the lower limit switch is touched, the lower solenoid valve is energized. The descent stops. At the same time, the clamping solenoid valve is powered off and the manipulator is relaxed. After relaxation, the rising solenoid valve is energized and the robot is raised. When rising to the top. When you touch the left limit switch, the left shift solenoid valve is powered off. Move left to stop. At this point, the robot completes a cycle of motion through an 8-step motion.
2 input and output terminal assignment
The programmable controller used in the robot control system of this paper is the robot control system of S7-200CPU214 produced by Siemens AG of Germany. A total of 14 inputs were used. 6 outputs. The terminal address assignment is shown in Table 1.
3 automatic operation program design
The robot automatic operation process is shown in Figure 1. The drop solenoid valve is energized and the manipulator is lowered. When it falls to the end. When the lower limit switch is touched, the lower solenoid valve is energized. The descent stops. At the same time, the clamping solenoid valve is powered off and the manipulator is relaxed. After relaxation, the rising solenoid valve is energized and the robot is raised. When rising to the top. When you touch the left limit switch, the left shift solenoid valve is powered off. Move left to stop. At this point, the robot completes a cycle of motion through an 8-step motion.
4 Conclusion
Programmable controller PLC with its rich I/O interface module and high reliability. Played a very important role in the design of the robot control system. But in the process of PLC control, there are still many problems to be solved. This paper presents some of its own views on several key issues in the design process. Proven by practice. Can effectively improve the system's anti-interference ability. For PLC read, write, event response and other communication time can be precisely controlled. got a good result.
A rice cooker or rice steamer is an automated kitchen appliance designed to boil or steam rice. It consists of a heat source, a cooking bowl, and a thermostat. The thermostat measures the temperature of the cooking bowl and controls the heat. Complex rice cookers may have many more sensors and other components, and may be multipurpose. Cooking rice has traditionally required constant attention to ensure the rice was cooked properly, and not burnt. Electric rice cookers automate the process by mechanically or electronically controlling heat and timing, thus freeing up a heating element on the cooking range that had to be otherwise occupied for rice cooking. Although the rice cooker does not necessarily speed up the cooking process, with an electric rice cooker the cook's involvement in cooking rice is reduced to simply measuring the rice, preparing the rice properly and using the correct amount of water. Once the rice cooker is set to cook, the rice will be cooked with no further attention.
Features:
For modern home rice cookers, the smallest single-person model cooks 1 rice cup (180 ml), whereas large models can cook 10 cups. Commercial models can cook 20 or more cups. As a possible source of confusion, model specifications and names may list either cooked or uncooked capacity. Rice roughly doubles in size during cooking; therefore, a 10 cup (uncooked) rice cooker can produce up to 20 cups of cooked rice. The prices vary greatly, depending on the capacity, features, materials used, and the country of origin.
The majority of modern electric rice cookers are equipped with a stay-warm or keep-warm feature, which keeps the rice at an optimal temperature for serving without over-cooking it. Some gas cookers also have electric stay-warm mechanism. However, the usefulness of this feature degrades over time, a microwave may be more energy efficient or better suited to reheat rice that will sit longer than four hours.
Some rice cookers use induction heating, with one or more induction heaters directly warming the pot. This can improve energy efficiency.
Most modern rice cookers use aluminium for the inner cooking bowl. There are some models that use stainless steel instead of aluminium. Various other materials, such as copper, pure carbon, ceramic, and diamond powder coating, may be used for higher heat conductivity or better taste.
The pressure-cooking models can raise the water's boiling point higher, e.g., from 100 °C at 1.0 atm up to about 110 °C at 1.4 atm, which speeds cooking. The pressure-cooking models can also be used in high altitude areas, where the boiling temperature is below 100 Celsius. Pressure cookers are also suitable for cooking brown rice (which contains oils and bran fiber that cook differently from pure white rice starch). Some pressure rice cookers have a varying pressure control mechanism (named the "dual-pressure" method) that creates repeated pressure/release cycles during the cooking.
There also exist mechanisms to collect and return the boiled over liquid to the inner rice bowl.
Many cookers now have microprocessor-controlled cooking cycles, which are often used to adjust for rice and cooking type.
Applications
Rice cookers are typically used for the preparation of plain or lightly seasoned rice. Each rice cooker model may be optimized to cook a certain type of rice best. For example, most Japanese rice cookers are optimized for cooking Japanese rice and may not be the best for other types of rice[citation needed], although cooking time can be lengthened simply by more water.
The typical method of cooking long grain rice is boil-and-strain and/or steaming method. The absorption method used in Japanese rice cookers will produce slightly different texture and taste, usually stickier rice.
Brown rice generally needs longer cooking times than white rice, unless it is broken or flourblasted (which perforates the bran).
Different varieties of rice need different cooking times, depending on their grain size, grain shape, and grain composition. There are three main types of Asian rice: Oryza sativa subsp. indica, i.e., Indian rice (long grain rice, e.g., basmati rice and Thai jasmine rice), O. sativa subsp. javanica, i.e., Java rice (large grain rice) and O. sativa subsp. japonica, i.e., Japanese rice (medium grain rice, e.g., Calrose rice, short grain rice, e.g., most Japanese rice and risotto rice).
African rice, Oryza glaberrima, is an entirely separate species, but can be cooked in the same way. Zizania is not even in the same genus, although it is often called a rice (or "water oats"); it, too, can also be cooked in a rice cooker.
A rice cooker can be used to cook many boiled or steamed granular foods, such as pot barley, bulgar wheat, and dal. Provided the ingredients have similar cooking times, a rice cooker can cook mixtures such as khichdi. Some rice cookers can be used as automated couscoussiers, cooking couscous and a stew simultaneously.
Rice Cooker
Rice Cooker,Drum Rice Cooker,Deluxe Rice Cooker,Straight Rice Cooker
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