Description
Part Number: IS230TNCIH4C
SKU: IS230TNCIH4CGBTC
Manufacturer: GE Boards & Turbine Control
Series: Mark VI IS200
A scanning cycle of PLC must go through three stages: input sampling, program execution and output refresh.
In the input sampling stage of PLC, firstly, read in the on-off status or input data of all input terminals temporarily stored in the input latch in sequence by scanning, and write them into the corresponding input status registers, that is, refresh the input. Then close the input port and enter the program execution phase.
In the program execution stage, PLC scans and executes each instruction according to the order in which the user program instructions are stored. After corresponding calculation and processing, the results are written into the output status register. All contents in the output status register change with the program execution.
Output refresh stage: when all instructions are executed, the on-off state of the output status register is sent to the output latch in the output refresh stage, and output in a certain way (relay, transistor or thyristor) to drive the corresponding output device to work.
Invensys Foxboro: I/A Series system, FBM (field input/output module) sequence control, ladder logic control, accident recall processing, digital analog conversion, input/output signal processing, data communication and processing, etc. Invensys Triconex: redundant fault-tolerant control system, Zui modern fault-tolerant controller based on triple module redundancy (TMR) structure.
EMERSON (series products)
10. Bosch Rexroth: Indramat, I/O module, PLC controller, drive module, etc.
◆ Motorola: MVME 162, MVME 167, MVME1772, MVME177 and other series.
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