In the S7-200 CPU, the counter for the accumulated number of pulses from the input terminal or internal components sent. It has up counter, down counter and up / down counter 3 types.Due to limitations counter frequency scan cycle, when the need for high-frequency signal can be counted when a high frequency counter (HSC).There are … Continue reading Siemens S7-200PLC Counter Area (C)

Local variables and variable storage memory is very similar, the main difference is that the local variables memory is partially valid, the variable memory is globally effective.Globally effective refer to the same memory can be used by any program (such as main program, an interrupt routine or subroutine) access to local storage areas and effective … Continue reading Siemens S7-200 PLC local variable storage area (L)

S7-200 converts an analog value (such as temperature or voltage) into a word-length (16-bit) digital value.You can use the area identifier (AI), the data length and the starting byte address to access these values.Since analog inputs of a word, and the even-number bytes (such as 0,2,4) started, it must be an even number byte … Continue reading Siemens S7-200 series PLC analog input (A1)

s7-200 PLC work at minus 20 degrees?S7-200 working environment requirements:0 ° C-55 ° C, horizontal installation0 ° C-45 ° C, vertical mounting95% relative humidity, non-condensingSiemens also offers a wide temperature range S7-200 product (SIPLUS S7-200):Operating temperature range: -25 ° C- + 70 ° CRelative Humidity: 55 ° C at 98%, 70 ° C 45%Other parameters … Continue reading What is the difference S7-200 PLC system operating temperature