Instruction manual for S7 series Siemens PLC 20

Here are some summaries of the holes I've found:

Siemens: Founded in 1847, Siemens AG is a global leader in electrical and electronic engineering. Since entering China in 1872, Siemens has been providing comprehensive support for China's development with innovative technologies, excellent solutions and products for more than 140 years, and has established a leading position in the Chinese market with outstanding quality and reliable reliability, leading technology and unremitting pursuit of innovation.

2015 (1 October 2014 to 30 September 2015);

Siemens has total revenues of 100 million euros in China and employs more than 32,000 people. Siemens has developed into an integral part of China's society and economy, and is committed to working hand in hand with China to achieve sustainable development.

In September 2014, Siemens AG and Bosch Group reached an agreement: Robert Bosch AG will acquire 50% of the shares of Bosch and Siemens Home Appliances Group (BSH), a joint venture held by Siemens, and after the transaction is completed, BSH will become a wholly-owned subsidiary of Bosch Group, and Siemens will completely withdraw from the field of home appliances. **The home appliance business is one of the manifestations of Siemens' strategy focused on electrification, automation and digitalization.

June 6, 2017

Dear, according to your question, I have helped you inquire: Siemens PLC maintenance can be roughly divided into the following steps: 1. Check 1. Check the instrument interface to ensure that it will not be subject to electromagnetic pollution; 2. Use relevant instruments to check the temperature, pressure, voltage and flow rate of Siemens PLC to ensure its standards; 3. Observe the operation of Siemens PLC to confirm whether there is any obvious starting failure; 2. Replace parts 1, analyze the failure of each component of Siemens PLC, if you need to replace some parts, you need to record the status of the current PLC before replacement; 2. Use professional tools with good technology for maintenance, if you need to replace the accessories, you need to remove the old accessories and install new accessories; 3. Fiber testing only test 1, after the installation of new accessories, the system power needs to be restarted first to confirm that the Siemens PLC system can be used normally; 2. If the Siemens PLC system is found to be abnormal, the PLC can be detected offline to ensure the normal operation of the system; 3. Finally, it is necessary to confirm whether the alarm and data acquisition of the Siemens PLC system are normal, which can ensure the normal operation of the PLC system.

In addition to the above three parts of the maintenance steps, the maintenance of Siemens PLC also needs to be adjusted according to the actual application situation, such as intelligent maintenance, security system coverage maintenance, network construction maintenance, etc., these steps can make the Siemens PLC system more perfect, in line with the user's needs and current application scenarios, so that the system operation is more stable.

When the left-turn jog switch (LE) connected to the input point is closed, the motor rotates in a counterclockwise direction, and when the right-turn jog switch (RI) connected to the input point is closed, the motor rotates in a clockwise direction. However, there is a precondition that the motor circuit breaker connected to the input point and the shutdown switch (off) connected to the input point are not operating. Only by pressing the stop switch and waiting for 5 seconds can you change the direction of rotation of the motor.

This is done to give the motor enough time to brake and stop before starting in reverse, if the motor needs to be reversed. If you press the jog switch at the same time as the inching switch, the motor stops and does not start.

Procedures and Notes.

If the motor circuit breaker (no action at the input point, no action at the stop jog switch (no action at the input point (both contacts are NC contacts): and the status bit is not set to rotate clockwise flag, the enable bit is set to logic 1. It is possible for the motor to rotate counterclockwise.

The state bit that represents the counterclockwise rotation is. In a similar way, the starting conditions for clockwise rotation can be obtained.

The motor starts when the jog start switch (IE and RI) is activated, and neither the interlock nor the status position is set in the opposite direction of rotation. That is, the relevant output bits and status bits are set, and the function of the state bits is to enable the output to protect itself. The motor rotates in the counterclockwise direction, and the starter is controlled by the output point.

The motor rotates clockwise, and the starter is controlled by the output point.

In addition, there is another set of signal lights to indicate the current operating status of the motor; The counterclockwise rotation indicator (LE) is connected to the output point; The clockwise rotation indicator (RI) is connected to the output point; The motor off indicator (OFF) is connected to the output point.

The questions you are asking are too broad, first go to read the book, learn it, it is recommended to read the Siemens user manual, you have to read through.

Look at the book, find a master to take it, and avoid detours.