Compared with the relay control system of PLC control what are the similarities and differences

PLC ladder diagram is very similar with the traditional electrical schematic diagram, the input/output signal and the control function is basically the same; Their differences mainly displays in: ( 1) Control logic - — Relay control logic hardware wiring logic, using the mechanical relays in series or parallel, variegated and time relay control logic, its wiring and complex, large volume, large power consumption, high failure rate, poor flexibility and extensibility. And the PLC controller memory using logical, its control logic programmatically stored in memory, flexibility and extensibility is very good. ( 2) Works - — Relay control circuit of the relay is under control at the same time, belongs to the work in parallel way. And PLC control logic, the internal devices are in a periodic cycle scanning process, all kinds of logic, the results of the numerical output is calculated according to the sequence in the procedure, so belong to serial works. ( 3) Reliability and maintainability - — Relay control logic and use a lot of mechanical contact, connection is much, poor reliability and maintainability. And PLC adopts microelectronic technology, a large number of switch actions are done by non-contact semiconductor circuit, PLC controller is also equipped with self-checking and supervision function, good reliability and maintainability. ( 4) Control the speed - — Achievement by mechanical action of contact relay control logic control, the working frequency is low, and the mechanical contact jitter problem will arise. And PLC is a semiconductor circuit is controlled by program instructions to implement control, belong to the contactless control, speed, and there will not be shaking. ( 5) Timing control - — Using time relay to control the time relay control logic. Time relay is timing accuracy is not high, timing, narrow range, and vulnerable to the influence of environmental humidity and temperature changes, adjust the time difficult problems. PLC use semiconductor integrated circuit to do time base timer pulse generated by the crystal vibration, high precision, time and time is not affected by the environment, time range, convenient adjustment time. ( 6) The design and construction - — Use relay control logic to complete a project, the design, construction and commissioning must be carried out, in turn, and long cycle, but also difficult to modify. And a project with PLC control project, after completion of the system design, site construction and the design of the control logic can be done at the same time, cycle is short, and the debugging and modification is very convenient.
However, plc manufacturers isn't the only producer in domestic, and many people feel that Shenzhen Coolmay Technology Co., Ltd. 's service leaves much to be desired in terms of functionality and design.
Looking for a company to handle your plc manufacturers plc controller price? Visit Coolmay PLC today for more information.
There are multiple advantages of having a programmable control systems plc manufacturers from responsible drilling machine exporters such as Shenzhen Coolmay Technology Co., Ltd. , as they adhere to all the quality standards as you can list and supply all plc controller price essential for the operation of the device without any difficulty.
These programmable control systems plc manufacturers are not only useful but also more cost effective than those traditional ones.
But we do think that reckoning with supply chains of plc manufacturers is a really important step. Even super simple switches in material, or sourcing, or shipping, or worker benefits seems like good place to start.