ABB SYN5202-0271 quasi synchronous device

Description

When designing a PLC system, the first step is to determine the control scheme, and the next step is to select the PLC engineering design. The characteristics and application requirements of the process flow are the main basis for design and selection. The PLC and related equipment should be integrated and standardized, and selected based on the principle of easy integration with industrial control systems and easy expansion of their functions. The selected PLC should be a mature and reliable system with operational performance in relevant industrial fields. The system hardware, software configuration, and functions of the PLC should be suitable for the device scale and control requirements. Familiarity with programmable controllers, functional diagrams, and related programming languages is beneficial for shortening programming time. Therefore, when selecting and estimating engineering design, it is necessary to analyze the characteristics and control requirements of the process in detail, clarify the control tasks and scope, and determine the required operations and actions. Then, based on the control requirements, estimate the number of input and output points, required memory capacity, determine the functions of the PLC, external device characteristics, etc, Finally, choose a PLC with a high cost performance ratio and design the corresponding control system.

1、 Estimation of input/output (I/O) points
When estimating I/O points, appropriate margin should be considered. Usually, based on the input and output points counted, an additional 10% to 20% of the expandable margin should be added as the input and output point estimation data. When placing an actual order, it is also necessary to round off the input and output points based on the product characteristics of the manufacturer’s PLC.

2、 Estimation of memory capacity
Memory capacity is the size of the hardware storage unit that the programmable controller itself can provide, while program capacity is the size of the storage unit used by user application projects in memory, so program capacity is smaller than memory capacity. During the design phase, as the user application program has not yet been developed, the program capacity is unknown during the design phase and needs to be determined after program debugging. In order to have a certain estimation of program capacity during design and selection, memory capacity estimation is usually used instead.

There is no fixed formula for estimating the memory capacity of memory. Many literature sources provide different formulas, which are generally based on 10-15 times the number of digital I/O points, plus 100 times the number of analog I/O points. This number is used as the total number of words in memory (16 bits are a word), and a margin of 25% of this number is considered.

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