PDD200A101 3BHE019633R0101/3BHE020P201 ABB Control board circuit board

Description

Technical Description PDD200A101 3BHE019633R0101/3BHE020P201：

PDD200A101 Although PLC used in the ladder chart program often used to many relays, timers and counters and other names, but the PLC is not a physical entity with these hardware, but in memory and programming to do logic control editing, and by the output component connected to the external mechanical device to do entity control. Therefore, the hardware space required by the controller can be greatly reduced. PDD200A101 actually PLC execution of the ladder graph program operation mode is line by line first the ladder graph code to scan into the CPU and finally execute the control operation. The whole scanning process includes three steps, “input status check”, “program execution” and “output status update” are described as follows: Step 1 “Input status check” : PLC first checks the switch or sensor status of each point connected to the input element (1 or 0 represents on or off), and writes its status to the corresponding position Xn in memory. PDD200A101 Step 2 “Program Execution” : Take the step graph program line by line into the CPU for calculation. If the program execution needs to input the contact state, the CPU will directly query it from the memory. The calculation result of the output coil is stored in the corresponding position in the memory and is not reflected to the output end Yn temporarily. PDD200A101 Step 3 “Output Status Update” : Update the output status in Step 2 to the PLC output contact and return to Step 1. PDD200A101 The three steps are called PLC scan cycle, and the time required to complete is called PLC reaction time, if the time of PLC input signal is less than this reaction time, there is the possibility of misreading. After each program execution and before the next program execution, the output and input states are updated once, so this mode of operation is called the output input end of program regeneration.

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PDD200A101

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