ABB distributed control system NMTU-21C3BSE017429R1 digital output module
Brand ABB Color Standard Application Industrial Height 255mm rated current 460mA
Protection Level IP45 Suitable for motor power 186KW Application Site Power Industry BOM Number GJR2391500R1220 Power industry HIEE401782R0001 Part Number NMTU-21C
Applicable pipe 2 Whether imported is weighing 6.88 kg can be sold nationwide
ABB distributed control system NMTU-21C3BSE017429R1 digital output module
1) CPU: the core component of PLC, directing PLC to carry out various work. Such as accepting user programs and data, diagnosing, performing executive procedures, etc.;
(2) Memory: storage of system and user programs and data;
(3) I/O interface: the connection part between the PLC and the controlled object in the industrial production site, which is used to accept the controlled signal and the execution result of the output program;
(4) Communication interface: information exchange with monitors, printers and other devices through communication interface;
(5) Power supply. Thyristor output type: under normal circumstances, only AC load, fast response speed, high frequency of action;
Transistor output type: under normal circumstances, only with DC load, fast response speed, high frequency of action;
Relay output type: under normal circumstances, it can carry AC and DC load, but its response time is long and the operation frequency is low. 1) Integral: the CPU, power, I/O components are concentrated in a chassis, compact structure, low price, generally small PLC use this structure;
(2) Modular: the various parts of the PLC are divided into several separate modules, which can be selected according to the needs of different modules to form a system, with flexible configuration, easy expansion and maintenance characteristics, generally medium and large PLC adopt this structure. Modular PLC is composed of a frame or substrate and various modules, and the module is mounted on the socket of the frame or substrate.
(3) Stacked: combined with the characteristics of integral and modular, stacked PLC CPU, power supply, I/O interface, etc., are also independent modules, but they are connected by cable, making the system not only flexible configuration and small size.
5, what is the PLC scan cycle? What is it mainly affected by?
The scanning process of PLC includes five stages: internal processing, communication service, input processing, program execution, and output processing. The time required for scanning in these five stages is called the scanning cycle.
The scan cycle is related to CPU speed, PLC hardware configuration and user program length.
6. What method does PLC use to execute user programs? What are the stages of user program execution?
PLC adopts cyclic scanning method to execute user program, the execution process of user program includes input sampling stage, program execution stage and output refresh stage.
ABB distributed control system NMTU-21C3BSE017429R1 digital output module
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