What is a two bus in fire engineering? See supplements

Second, the bus working mode is relative to the previous multi-wire working mode.

In the past, the probes and modules were multi-line, that is, each probe and module needed two separate wires from the fire control room fire host, and 10 probes needed 10 sets of wires, which was very troublesome, and now the probes and modules were coded, and each loop only needed a return line from the fire control room, usually called two buses (usually with twisted pairs), and the intelligent probes and modules could be connected.

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The second bus of fire protection refers to the way in which the equipment of fire equipment manufacturers in the fire protection industry uses two wires to achieve power supply and communication.

In terms of the most widely used Powerbus bus in the industry, only two wires are needed between the host and the detector equipment, and it supports non-polar wiring and any topology has no requirements for cables, that is, it can not distinguish between G lines, and ZR-RVS2* is a cable specification, which refers to a square flame retardant twisted pair.

Second, the bus working mode is relative to the previous multi-wire working mode.

In the past, the probes and modules were all multi-wired, that is, each probe and module needed two separate from the fire control room.

The line drawn out by the fire host, 10 probes need 10 sets of wires, it is very troublesome, now the probes and modules are encoded, each circuit only needs a return line drawn from the fire control room, usually called two buses (usually with twisted pairs), the intelligent probes and modules can be connected.

This is the two-bus mode of operation.

Nowadays, both probes and modules work in the bus mode, and even non-intelligent detectors can be connected to the two buses through the intelligent module.

There is a difference between what the book says and the actual application, if you want to learn, you have to go to the construction site and read the equipment installation and use instructions on the site. At the moment you don't even understand the wires, I'm really defeated. ZR-RVS2* is a flame-retardant multi-strand twisted pair wire, BV wire single-strand hard-core wire, the book sees that the second bus is said to be a polar bus system, and now it is basically a bus system without memory.

Books are based on American, British, or Japanese products, which are outdated. I suggest that you find an alarm manufacturer to ask for this installation and use manual, it is beneficial to you.

There are two signal wires from the alarm host to the detector, zr-rvs2*, which are flame retardant twisted pairs. As for twisted pairs, two wires are wound together, and that's how it was bought. As for the power cord BV cable.

Because some devices such as control modules require 24V power supply. As for the grounding, it should be used for the grounding of the alarm host. Others do not need to be grounded in the alarm.

The bus is a combination of the signal transmission line of the automatic fire alarm system and the fire linkage system, that is, there are detectors, manual alarm buttons, and control fire linkage facilities (such as fire blinds, fire dampers, electric cutting, etc.) in a circuit, and the action and control module cycle to receive the action feedback signal. That is, the devices are connected in parallel on the bus. The method of wiring the bus system is relatively simple.

The fire bus, also known as the second bus, is a low-voltage power supply bus technology.

The two-bus is a high-reliability, automatic synchronous encoding and decoding communication, which can convert multiple analog quantities of field nodes into digital quantities and carry out long-distance serial transmission. Its features are as follows:

a.Intelligent tracking auto-coding; Sensitive.

b.Long-distance monitoring, monitoring distance 3km;

c.Transmit signal and power at the same time, and the node does not need to be supplied separately;

RF101 is the master control module of the power supply two-bus technology, RF601 is the slave receiving chip, and the two-bus technology is one-to-many, which can connect 256 devices at the same time.

Summary. Hello, glad to answer for you. The fire upper two bus usually refers to the signal two bus. The power bus is the power supply line.

In fire protection, what does signal bus 2 bus and power bus mean? What's the difference?

Hello, glad to answer for you. The fire upper two bus usually refers to the signal two bus. The power bus is the power supply line.

The signal two bus is connected with the controller of the line hole stool punch, is a communication protocol, of course, also provides working power for some detectors, coarse socks such as point smoke fire detectors. The power cord is set up to supply DC 24V power to the site.

The second bus is the alarm bus, and the second bus is the 24V+- power line; Smoke detectors, Zhixiang hand reports, etc. only use alarm buses, and only need signal feedback; The output module class needs to be connected to the alarm bus + 24V power cord because it wants to hold the load.

In fire protection, what does signal bus 2 bus and power bus mean? What's the difference?

In fact, the second bus and the second bus of the power supply in the fire are just called differently. It's just the way the fire bus is applied in different equipment. Because the functional capabilities of the fire bus are limited, some products with less power consumption, such as:

Smoke detectors, hand newspapers, these power consumption is small, do not connect the external power cord, directly use the fire bus laughing Luxing power supply + plus communication, on two lines. For some products with larger power, such as sound and light alarms, floor displays, the power consumption is relatively large, it is only used for fire bus communication, and the power supply is provided separately nearby, and there will be a fire power supply with backup power near the equipment, and the application of additional power supply for the equipment in the fire protection zone is generally not used for fire bus, but with a bus that can bring high power.

Second, the bus working mode is relative to the previous multi-wire working mode.

The earliest and previous automatic fire alarm control systems all adopted the split line system. In this kind of system, each detector and alarm controller need 2-4 wires respectively, but with the scale of the automatic fire alarm system is getting larger and larger, and is constantly developing in the direction of intelligence, network talk, and multi-functionalization, the split line system system has not been able to adapt well to this requirement.

Second, the bus working mode is relative to the previous multi-wire working mode.

The earliest and previous automatic fire alarm control systems all adopted the sub-line system. In this system, 2-4 wires are required between each detector and the alarm controller, but with the automatic fire alarm system.

The scale is getting bigger and bigger, and day by day towards the development of intelligence, network talk, and multi-functionalization, the split line system system can no longer be well adapted to this requirement.

Taking the fire emergency evacuation residual pressure control system of the fire protection system as a case study, let's talk about the two bus working modes:

The second bus takes the Powerbus bus as an example. First of all, the powerbus two bus is a centralized power supply mode, and it is the system communication + power supply, as long as two wires, the mode has a strong anti-interference ability, can be long-distance power supply, and can be arbitrarily distributed wiring, simplifying the construction plan, but also non-polar power supply, construction wiring is convenient, cost-saving, power supply capacity is strong, and the maximum load on each circuit is 256 nodes.

It is composed of residual pressure monitoring host, residual pressure controller, residual pressure sensor, pressure relief valve actuator, residual pressure monitoring host is installed in the fire control room and can monitor the whole system in real time, is connected to the residual pressure controller through two buses, and the residual pressure controller reads the residual pressure value and alarm value of the residual pressure sensor in real time, and then relieves the pressure of the fan through the pressure relief actuator, and the residual pressure controller can be directly used to form a small system without connecting the residual pressure monitoring host. The residual pressure sensor provides the residual pressure value and residual pressure alarm in the field. The pressure relief valve actuator performs a control signal from the residual pressure monitor to control whether the pressure is relieved or not.

Moreover, the product design is simple, and the traditional universal UART serial port operation is adopted, so the development gate is low.

The second bus working mode is that all fire alarm systems are connected by two wires except for those that require power supply, and there is no polarity. Originally, there were four-bus, six-bus, and multi-wire systems. As for the number of alarm linkage points with each group of two buses, it depends on the selected equipment.

A simple diagram illustrates the difference between a bus system and a multi-wire system.

Multi-wire system: each device has a separate communication line, but this way is obvious that the wiring is complex, and the project cost is high. Bus system:

Each device has two common communication lines and power lines, when the power line has two (plus or minus) this is the model of the four-wire bus equipment, and the ground of the power line and the communication line are shared, and the three-wire equipment is made. Now the bus system equipment with the development of technology has appeared two bus equipment, that is, the slave wiring only 2 wires, to minimize the construction difficulty and engineering cost, on behalf of the technology mbus, powerbus, its principle is through the communication line to the back-end equipment power supply, so the power line is completely reduced, but also the trend of fire protection in the future.