Siemens Jiaxing authorized agent

Siemens Jiaxing authorized agent Siemens Jiaxing authorized agent

SIEMENS Xunzhiman Intelligent Control Technology (Shanghai) Co., Ltd

Our Siemens automation products have quality assurance and price advantages

Siemens PLC, Siemens touch screen, Siemens CNC system, Siemens soft start,

Siemens Ethernet Siemens motor, Siemens frequency converter, Siemens DC speed controller,

Our company has a large supply of Siemens wires and cables in stock, with a price advantage*

With the work policy of "people-oriented, technology leading, customer satisfaction, and continuous improvement", Shanghai Jiecheng Company is committed to product development, engineering support, and system integration in the field of industrial automation control. It has rich experience in the application and practice of automation products, as well as strong technical strength, especially in PLC complex control systems, transmission technology applications, servo control systems, CNC spare parts, human-machine interfaces, and network/software applications. In recent years, Shanghai Jiecheng Company has established a good cooperative relationship with the automation and drive department of Germany's SIEMENS company. Its business in programmable controllers and AC/DC transmission devices has grown exponentially year by year, providing SIEMENS technology and automatic control solutions for users

The installation of PLC is suitable for most industrial sites, but it still has certain requirements for usage scenarios, environmental temperature, etc. Controlling the working environment of PLC can effectively improve its work efficiency and lifespan. When installing PLC, avoid the following places:

(1) The range of environmental temperature exceeding 0-50 ℃;

(2) Relative humidity exceeding 85% or the presence of dew condensation (caused by sudden temperature changes or other factors);

(3) Direct sunlight exposure;

(4) Corrosive and flammable gases, such as hydrogen chloride, hydrogen sulfide, etc;

(5) Inspecting iron filings and dust;

(6) Frequent or continuous vibration with a frequency of 10~55Hz and an amplitude of 0.5mm (peak to peak);

(7) An impact exceeding 10g (gravitational acceleration).

There are mounting holes on all four corners of the small programmable controller housing. There are two installation methods, one is to fix it with screws, and different units have different installation sizes; Another type is DIN (German Republic Standard) rail fixation. Installation clamps for DIN rails, one pair on each side. On the track, first install the left and right clamps, install the PLC, and then tighten the screws. In order to make the control system work properly, programmable controllers are usually installed in control cabinets with protective enclosures to prevent dust, oil stains, and water splashes. In order to ensure that the temperature of the programmable controller remains within the specified ambient temperature range during operation, the installation machine should have sufficient ventilation space, and there should be a gap of at least 30mm between the basic unit and the expansion unit. If the surrounding environment exceeds 55C, an electric fan should be installed to force ventilation.

In order to avoid electrical interference from other peripheral devices, programmable controllers should be kept as far away as possible from high-voltage power lines and equipment, and a distance of at least 200mm should be left between programmable controllers and high-voltage equipment and power lines.

When the programmable controller is installed vertically, it is necessary to strictly prevent wire heads, iron filings, etc. from falling into the interior of the programmable controller through the ventilation window, causing a short circuit in the printed circuit board, making it unable to work properly or even damaged.

2. The power supply for PLC is 50Hz, 220V ± 10% AC power. The FX series programmable controller has a DC 24V output terminal. This terminal can provide a DC 24V power supply for input sensors such as photoelectric switches or proximity switches. If the power supply fails and the interruption time is less than 10ms, the PLC operation will not be affected. If the power interruption exceeds 10ms or the power drop exceeds the allowable value, the PLC will stop working and all output points will be disconnected simultaneously. When the power is restored, if the RUN input is turned on, the operation will proceed automatically. The PLC itself has sufficient resistance to interference from power lines. If the power interference is particularly severe, an isolation transformer with a ratio of 1:1 can be installed to reduce the interference between the equipment and the ground.

3. Good grounding is an important condition for ensuring the operation of PLC, which can avoid accidental voltage surge hazards. The grounding wire is connected to the grounding terminal of the machine, and the basic unit is grounded. If an expansion unit is to be used, its grounding point should be connected to the grounding point of the basic unit. In order to suppress interference applied to the power supply and input/output terminals, the programmable controller should be grounded, and the grounding point should be separated from the grounding point of the power equipment (such as the motor). If this requirement cannot be met, it is also necessary to achieve common grounding with other devices and prohibit series grounding with other devices. The grounding point should be as close as possible to the PLC

When using passive contact input devices for the DC 24V terminal, the internal 24V power supply of the PLC provides a current of 7mA per point to the input terminal through the input device. The 24V terminal on the PLC can also provide current to external sensors such as proximity switches or photoelectric switches. When using a 24V terminal as a sensor power supply, the COM terminal is the DC 24V ground terminal. If an extended crew is used, the 24V terminals of the basic unit and the extended unit should be connected. Additionally, no external power source can be connected to this terminal. If an overload occurs, the voltage will automatically drop, and the input at this point will not work on the programmable controller.

The number of input points for each model of PLC is specified. For each unused input point, it does not consume power, so in this case, the ability of the 24V power terminal to supply current to the outside can be increased. The empty terminals of FX series PLC cannot be used under any circumstances.

5. Input wiring PLC generally accepts switch signals from travel switches, limit switches, and other inputs. The input terminal is a port for converting signals between PLC and external sensor loads. Input wiring generally refers to the wiring between external sensors and input ports. The input device can be any passive contact or NPN transistor with an open collector. When the input device is turned on, the input terminal is connected, the input circuit is closed, and at the same time, the input indicator LED lights up. The primary and secondary circuits at the input end are isolated by photoelectric coupling. The secondary circuit is equipped with an RC filter to prevent PLC misoperation caused by input contact jitter or electrical noise from the input line. If diodes are connected in series in the input contact circuit, the voltage across the series diodes should be less than 4V. If a reed switch with light-emitting diodes is used, the number of series diodes cannot exceed two. In addition, special attention should be paid to the following points when wiring the input:

(1) The input wiring should generally not exceed 30m. However, if the environmental interference is small and the voltage drop is not significant, the input wiring can be appropriately longer.

(2) The input and output lines cannot use the same cable and must be separated.

(3) The width of the pulse signal that the programmable controller can accept should be greater than the time of the scanning cycle.

6. Output wiring

(1) Programmable controllers come in three forms: relay output, thyristor output, and transistor output.

(2) The output terminal wiring is divided into independent output and common output. When the output relay or thyristor of the PLC is activated, two output terminals of the same number are connected. Different types and voltage levels of output voltages can be used in different groups. But the outputs in the same group can only use power supplies of the same type and voltage level.

(3) Due to the fact that the output components of PLC are packaged on printed circuit boards and connected to terminal boards, if the load connecting the output components is short circuited, the printed circuit board will be burned. Therefore, fuse protection should be applied to the output components.

(4) When using a relay output, the size of the inductive load it bears affects the working life of the relay, so a long working life is required for the relay.

(5) The output load of PLC may generate noise interference, so measures should be taken to control it. In addition, for hazardous loads that can cause harm to users, in addition to considering them in the control program, an external emergency stop circuit should also be designed to cut off the power supply of the load causing harm when the programmable controller fails. Do not use the same cable for AC output lines and DC output lines. The output lines should be kept as far away from high-voltage lines and power lines as possible to avoid parallelism.