How does PLC determine the number of points in the distribution monitoring system

It's simple, do you pay for it, I'll do it for you.

Determine based on the device to be controlled:

1. The DI point, the discrete quantity, is the passive contact, the input point.

2. The DO point, the discrete amount, is the output point of the PLC, which is generally converted into a passive rubber relay.

Point, analog, is the amount to be collected, for example, 4-20mA, 0-5V analog signal draft, 4, ao point, analog, is the output of the quantity, for example, 4-20mA, 0-5V analog signal.

5.Other functional modules, such as Ethernet conversion modules, PROFIBUS modules, PID adjustment modules, are subject to specific problems.

Finally, according to their own noisy side price and user requirements, the technical requirements determine the reservation point.

Hope it helps.

According to your project requirements, see how many detection components and external digital signals (buttons, lifts, etc.) need to be used, that is, I point; Look at the number of peripheral control equipment, such as: relays, solenoid valves (single-action, double-laugh collapse), etc. to determine the number of O points to eliminate this amount, and leave 15% and 20% as backup points after calculation.

Agree with the statement of the first floor and the second floor.

According to the control object, all the quantities that need to be input into the PLC are listed, and they are divided into: analog and digital;

According to the calculated demand, refer to the selection manual of each manufacturer's PLC, consider whether the "expansion module" is needed and the number of expansion modules supported by the PLC. The same goes for the number of output points.

In addition to considering the number of input and output points, the selection of PLC should also consider: processing speed (whether there is a lot of data, real-time requirements), memory (how big the program), supported communication functions, supported modules, whether it supports redundancy, etc.

The control object determines the number of output points, and the control condition determines the number of input points.

It mainly depends on how many nodes need to be controlled externally, such as basic start-stop, limit, switch, etc.

This depends on how many objects you control, as well as the control method, the functions that need to be implemented, and so on.

If you only need to implement the function of one motor forward and backward, you can choose a small PLC.

Anyway, PLC I o generally reserves 10% 20%.

Generally speaking, it is based on the original design drawings to determine the point, popularly known as the point, if there are no drawings, the simplest is to count the number of heads, generally speaking, a person a computer, a**, to see if there is any other need for computers and ** places, such as conference rooms, front desk, warehouse, multi-** room, reading room, and even kitchen or toilet are possible, specific problems are analyzed!

The service area of each workspace should be determined by different application functions.

Building Type & Function Workspace area (m2).

Sites with dense terminal equipment such as network management centers, call centers, and information centers 3 5

Office area 5 10

Meetings, Exhibitions 10 60

Shopping malls, production rooms, entertainment venues 20 60

Stadiums, lounges, public facilities 20 100

Industrial production area 60 200

The number of information socket modules (electrical and optical) in each workspace should not be less than 2, and meet the needs of various services.

According to the furniture drawing, that is, the drawings provided for the decoration.

In principle, each workstation has 1 data and 1 voice, in addition, the printing room, conference room, lounge, and boss room must be set up according to the requirements of Party A, because the number of these places is more.

If you have any questions, please continue to ask.

It is divided into small, medium and large, taking Siemens PLC as an example, it corresponds to 200 series, 300 series and 400 series respectively. Basically, in actual usage, if the number of points is within 100, use 200PLC, if the number of points is within 100-300, use 300 series, and if the number of points exceeds 300, basically use 400.

Different types of PLC, not only can expand the number of IO points, PLC processing capacity is also greatly enhanced, like a large system, not allowed to fail at all, so it will require the use of redundant systems, and only 400PLC has this function, so, to distinguish the type, is the matching of points and functions.

According to the various electrical requirements, interlocking requirements, external detection components, etc. of the actual control equipment, the IO points of the PLC can be determined after comprehensive consideration.

If the number of points is within 100-300, use the 300 series, and if the number of points exceeds 300, basically use 400. It's not absolute. Because the cost of 400 is too high, it also depends on the requirements of control accuracy.

If the accuracy requirements are not high and the budget is limited, the S7-300 can be used for large-scale system applications.

Determine the number of IO points of the control system, and leave a margin of 15% when selecting the model.

I don't know what PLC system you use, through your choice of UPS, you estimate the power of medium-sized or mainframe, take Siemens 300PLC various module power as an example:

The typical power consumption of DI module is as follows: between (different power is different according to the selection of DI module);

The typical value of the power consumption of the DO module is as follows: between (according to the selection of the DO module, the power is different, and the general power is below);

The typical power consumption of AI modules is as follows: between (different power varies according to the selection of DI modules);

The typical power consumption of AO module is between 3W and 6W (different power according to the selection of AO module);

The power load of other modules is not large, and the computer load and important instrument load are increased according to your control needs.

The above information is from the Siemens Programmable Controller Product Selection Manual.

I hope you find the above information helpful.

PLC less than or equal to 32 points Its power is less than 20W It is recommended to consider the life External contactor for amplification control The host should consider the power factor UPS capacity should be taken as multiple of the load capacity.

Generally, it should be calculated according to the IO point, the more IO, the greater the power, 50W should be enough.

Have a nice job.

Generally, it should be calculated according to the IO point, the more IO, the greater the power, 50W should be enough.

Generally, the computer is about 150 watts, and the PLC is dozens of watts.

The input of the PLC is the contact point of the photoelectric switch, cylinder magnetic reed, micro switch and other PLC signals; The output of the PLC is the contact for driving the solenoid valve and the bulb; Therefore, the input of the PLC is the signal from the outside to the PLC, and the output of the PLC is the signal from the PLC to the outside world;

When you choose the IO module, as long as you know how many components are used for PLC signals in the whole equipment, you can know how many points of input module are used, and you can know how many points of output module are used if you know how many components to be controlled by PLC.

In addition, the number of input and output points should be reserved, generally about 5 each, depending on the actual situation.

If you still don't understand.

There are several possibilities for this, 1 crankshaft position sensor, it has no signal, this you can see with the computer, 2 the line under the fuse box is faulty, 3 anti-theft works! 4. The relay of the fuse box, the main relay and the fuel relay look down, if they are all good, it will be more troublesome, and the computer board and wiring should be checked.