6ES7214-2BD23-0XB8 performance parameters

6ES7214-2BD23-0XB8 performance parameters

File to ensure no error occurs during operation. Both bus-terminating resistors must always have voltage.
(4) If there are more than 32 segment stations, repeaters must be used to connect each bus segment. In general, there are no more than 3 repeaters in series.
(Note: the repeater has no station address, but is included by the computer in the maximum station number of each segment)
(5) The maximum cable length depends on the transmission speed. If type A cable is used, the transmission speed and length are as follows:
Baud rate: (K bit/s) 9.6 19.2 93.75 187.5 500 1500 1200
distance/section(M) 1200 1200 1200 1000 400 200 100
(6) Type A cable parameters:
Impedance: 135-165Ω Capacitance: <30 pf/m Loop resistance: 110Ω
Wire gauge: 0.64mm Wire area: >0.34mmΩ
(7) It is better to use a 9-pin D-type plug for the PROFIBUS network of RS-485 transmission technology.
(8) When connecting each station, make sure that the data lines are not twisted and the system must use shielded cables, shielding improves electromagnetic compatibility (EMC).
(9) If shielded stranded wire and shield foil are used, both ends should be connected to protective earth and covered with shield wiring of the largest possible area to maintain integrity. conductivity. In addition, it is recommended to isolate the data line from the high voltage line.
(10) When the data transmission rate exceeds 500K bit/s, the stub segment should be avoided and the existing plugs on the market should be used to make the data input and output cables direct It is connected with the plug and the socket plug connection can be connected or disconnected at any time without interrupting data communication from other stations.

3 IEC1158-2 transmission technology for PA
(1) The data transmission technology of IEC1158-2 is adopted for PROFIBUS-PA , which can meet the requirements of the chemical and petrochemical industry. It can maintain its intrinsic safety and provide power to field devices through the bus.
(2) IEC1158－2 is a A bit synchronous protocolfor continuous transmission without power, commonly called H1.
(3) IEC1158-2 technology is used in PROFIBUS-PA and its transmission is based on the following principle Based on:
①. Each segment has only one power supply as a power device.
②．When the station sends and receives information, no power is supplied to the bus.
③. The constant stable base current consumed by each field device.
④. Field devices act as passive current sinks.
⑤．Both ends of the main bus serve as passive terminal lines.

⑥. Allows the use of linear, tree and star networks.
⑦. To increase reliability, redundant bus segments can be used in the design.
⑧. For modulation purposes, it is assumed that at least 10 mA of base current is required at each station to start the device. The communication signal is generated by the modulation of the transmitting device , from ±9mA to base current
(4) IEC1158－2 transmission technical features:
①. Data transfer: digital. bit sync. Manchester encoding.
②. Transfer rate: 31.25K bit/s, voltage type.
③. Data fidelity: use preamble, start and stop qualifiers to avoid errors.
④. Cable: twisted pair, shielded or unshielded.
⑤. Remote power supply: optional accessory, via data cable.
Intrinsically safe operation.
⑦. Topology: Line or tree, or a combination of both.
⑧. The number of stations: up to 32 for each segment, up to 126 in total.
⑨. Repeater: expandable up to 4 units.

4. IEC1158 installation points for transmission equipment
(1) The segment coupler connects the IEC1158-2 transmission technology bus segment to the RS-485 transmission technology bus segment. The coupler matches the RS-485 signal to the IEC1158-2 signal. They are on siteThe device's external power supply can be used for power, and the power device can limit the current and voltage of the IEC1158-2 bus.
(2) The PROFIBUS-PA network topology has a tree structure and a linear structure, or a combination of the two topologies.
(3) The field distribution box is still used to connect field devices and place bus-terminating resistors. When the tree structure is adopted, all field devices connected to the field line segment are connected in parallel to the field divider
(4) It is recommended to use the following reference cables, and other cables with thicker conductors can also be used.
①. Cable design: twisted pair shielded cable
② Wire Area (nominal): 0.8 mm2 (AWG18)
③ Loop Resistance (DC): 44Ω/Km
④. Impedance (31.25K Hertz): 100Ω±20%
⑤．Attenuation at 39 kHz:3dB/Km
⑥．Unbalance capacitance: 2nF/Km
(5) There is a passive terminator at both ends of the main bus cable, and there are RC elements in series inside, R = 100Ω, C = 1цF. When the bus terminal polarity is reversed, it has no effect on the bus function. has some effect.
(6) The maximum number of stations connected to a segment is 32. If intrinsically safe and bus-powered, the number of stations to beof limited. Even if intrinsic safety is not required, remote power is limited.
(7) To determine the longest length of the line, calculate the current according to Select, depending on the needs of the following parameters (2-2), a power supply and then determine which cable to use according to the length of the line in the following parameters (2-3).

(2－2): default power supply Device (operated value) Model scope supply voltage supply maximum current maximum power typical number of drives
Ⅰ EEx ia/ ibⅡC 13.5V 110mA 1.8W 8
Ⅱ EEx ia/IbⅡC 13.5V 110mA 1.8W 8
Ⅲ EEx ia/ IbⅡB 13.5V 250mA 4.2W 22
IV Not Intrinsically Safe 24V 500mA 12W 32
(Note: assume each device consumes 10mA
(2-3): Line length of IEC1158-2 transmission equipment
Power devise Type I Type II Type III Type IV Type V Type VI
Supply voltage (V) 13.5 13.5 13.5 24 24 24
Σ required current (mA) ≤110 ≤110 ≤250 ≤110 ≤250 ≤500
Q=0.8mm2 cable length (m) ≤900 ≤ 900 ≤400 ≤1900 ≤1300 ≤650
Q＝1.5mm2 cable length (m) ≤1000 ≤1500 ≤500 ≤1900 ≤1900 ≤1900

(8) External power supply: If the external power supply equipment is equipped with suitable isolation devices according to the EN500200 standard, it is allowed to connect the bus power supply equipment and the external power supply equipment to the intrinsically safe bus of.
5. Optical fiber transmission technology
(1) When the PROFIBUS system is applied in an environment with strong electromagnetic interference, you can use fiber optic conductors to extend the distance of high-speed transmission.
(2) Two kinds of fiber optic conductors can be used, one is the cheap plastic fiber conductor, which is used when the distance is less than 50 meters, and the other is the fiber optic conductor, which is used when the distance is less than 1km
(3) Many manufacturers offer special bus plugs that can convert RS-485 signals and can convert conductor signals or fiber optic conductor signals into RS-485 signals.

1. Concept and composition of intelligent community

The so-called intelligent community is to combine multiple buildings with the same or different. The overall planning method makes the functions more intelligent individually, fully shares the resources, and manages them in a unified manner. While providing a safe, comfortable, convenient, energy-saving and sustainable living environment, it is convenient for unified management and control, and improves the cost performance index as much as possible. . Since "intelligence" is a relative concept and "intelligence" technology itself continuously developed and improved, intelligent communities are just a general term for residential communities with a certain level of intelligence. As for the degree of intelligence that can be called an intelligent community, there are no qualitative and quantitative standards. The concept of community intelligence expresses that the intelligence of residential areas is a process. It grows and improves with the development of intelligent technology and the continuous growth of people's needs. It shows that applications for sustainable development are an important feature of community intelligence.

The community intelligent system can be generally decomposed into the following subsystems, each of which has a specific function: intelligent home system; community integrated cabling system; community network and communication system; community CATV system; community equipment Self-monitoring system; community security system; community intercom system; community smart meter reading system community property management and single card consumption system, community parking management system, community value-added management system, etc.

2. Informatization Community

The information community refers to the unified planning and construction of the community's information infrastructure so that the community's users can use various media (such as telephone), TV, computer, etc.) and a variety of ways (graphics, sound, video images, etc.) to obtain information inside and outside the community, exchange information and share resources, and have a high level of information interaction. These information infrastructures include community-integrated cabling systems, community communication networks, community computer local area networks, community CATV networks, etc. The community computerization system is to realize family computerization.

Third, the relationship between the intelligent community and the information community

From development, perspective includes the concept of an intelligent community an information-based community. But from the current point of view, the construction of an intelligent community in China is still in its infancy, and it pays more attention to the function of community and family. When building systems such as security measures, access control intercom, three-meter copying, and parking fees, little attention is paid to devoted to the communication network and information functions of the community. "Intelligent residential community function institutions" issued by the Ministry of Construction, we can see that information and communication services and management functions belong to popular standards, and some belong to higher standards. Therefore, from the current point of view, smart communities are not necessarily information-based communities, but with the further development of technology and social informatization, smart The informatization function of the community will become more and more perfect, and the concept of intelligent community will cover the informatization community

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