What does the two bus working mode mean in fire engineering?

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.

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. 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.

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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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.

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.

Now the alarm system of each manufacturer adopts the two-bus wiring method, that is, multiple alarm devices (smoke sensor, temperature sensor, hand report, etc.) can be connected in parallel on the two lines, according to the circuit capacity of each manufacturer, the maximum number of equipment connected by these two lines is not the same (for example: the bay circuit capacity is 242 points, other manufacturers have 96 points, there are 256 points, etc.).

The multi-line system is for the bus system, our national fire code has provisions, for some important equipment (such as: fire hydrant pump, sprinkler pump, smoke exhaust machine, etc.) must be controlled by the multi-line system, that is, each equipment must have a separate control line connected with the fire host, so that even if the line of a certain equipment is faulty or shortened by fire, it will not affect the use of other equipment.

The advantages of the bus wiring method: simple wiring, convenient construction, low project cost.

Disadvantages: Once there is a problem with a certain line, it may simply affect the equipment on a section of the line (or the entire circuit) and not work properly.

Advantages of multi-wire system: If there is a problem with one line, it will not affect the normal operation of other equipment.

Disadvantages: complex wiring, high project cost.

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.

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.

How it works:

The downlink data adopts the voltage signal, and the uplink data adopts the current signal, which can provide reliable stability in the multi-point, long-distance, and complex wiring system.

Expansion: Two Buss:

Compared with a four-wire system (two power supply lines and two communication lines), the power supply line and the signal line are combined into one, and the signal and power supply share a common bus. The second bus saves the cost of construction and cables, and brings great convenience to on-site construction and later maintenance. It has a wide range of applications in the fields of fire protection, instrumentation, sensors, industrial control, etc.

Typical two-bus technologies include M-bus, fire bus, etc.

2. Bus features:

1. The bus can be powered by power.

The two buses can supply power to field devices. There is no need to run power cables.

2. Stronger anti-interference ability.

The second bus has strong anti-interference ability, which is easier and more reliable for on-site construction wiring, and also saves labor and construction costs.

3. Long communication distance.

Second, the bus communication distance can reach 1000 meters (reliable value) or even 3000 meters, without repeaters.

4. Non-polar wiring.

In an area network with hundreds of points, once one of the points is reversed, it is extremely time-consuming and laborious to check. The two-bus wiring is non-polar and does not cause such problems.

5. Flexible wiring topology.

The two buses can be flexibly routed and support star, tree, and bus topologies.

6. Low cable requirements.

Second, the anti-interference ability of bus technology is very strong, and the requirements for cables are greatly reduced.

7. Reduce costs.

There is no need to isolate the power supply from the signal line, saving isolation costs. The PCB size is also greatly reduced.