HD 13T21 STD-EA1-FAGP-10051 KONGSBERG
Processing speed is related to the length of the user program, processing speed, software quality, etc. At present, the PLC contact has fast response and high speed, and the execution time of each binary instruction is about 0.2 ~ 0.4Ls, so it can adapt to the application needs of high control requirements and corresponding requirements. Scan cycle (processor scan cycle) should meet: small PLC scan time is not more than 0.5ms/K; The scanning time of large and medium-sized PLC is not more than 0.2ms/K.
Four, the choice of models
PLC is divided into two categories according to the structure of the whole type and module type, according to the application environment is divided into field installation and control room installation two categories; It can be divided into 1 bit, 4 bit, 8 bit, 16 bit, 32 bit, 64 bit and so on. From the application point of view, usually can be selected according to the control function or input and output points.
The I/O points of the overall PLC are fixed, so the user has less room for choice and is used for small control systems; Modular PLC provides a variety of I/O cards or cards, so users can choose and configure the I/O points of the control system more reasonably, and the function expansion is convenient and flexible, generally used for large and medium-sized control systems.
(2) Selection of input and output modules
The selection of input and output modules should be considered in accordance with the application requirements. For example, for the input module, the application requirements such as signal level, signal transmission distance, signal isolation, and signal power supply mode should be considered. For the output module, the type of output module should be considered. Generally, the relay output module has the characteristics of low price, wide voltage range, short life and long response time. Thyristor output module is suitable for frequent switching and low inductance power factor load, but the price is more expensive and the overload capacity is poor. The output module also has DC output, AC output and analog output, etc., which should be consistent with the application requirements.
According to the application requirements, intelligent input and output modules can be reasonably selected to improve the control level and reduce the application cost.
Consider whether you need extended racks or remote I/O racks, etc.
(3) The choice of power supply
PLC power supply, in addition to the introduction of equipment at the same time the introduction of PLC should be designed and selected according to the requirements of the product manual, the general PLC power supply should be designed and selected 220VAC power supply, consistent with the domestic grid voltage. In important applications, uninterruptible power supply or regulated power supply should be used.
If the PLC itself has an available power supply, it should be checked whether the current provided meets the application requirements, otherwise an external power supply should be designed. In order to prevent the introduction of the PLC by the external high-voltage power supply due to misoperation, the isolation of the input and output signals is necessary, and sometimes a simple diode or fuse tube can be used to isolate.
(4) Selection of memory
ALLEN BRADLEY 700-P1200A1 AC RELAYS, LOT OF 3
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