S7-200 analog input module (EM231,EM235) addressingEach analog expansion module, sorted by extension modules in the order, in which the analog input and output according to different sorting, respectively. Analog data format is one word, so the address must begin with an even number of bytes, precision 12-bit; analog values with the value 0-32000. Input format: … Continue reading Siemens PLC analog module usage questions
The difference between Siemens PLC and S7-300 S7-200, S7-400
The main class is one of the programmable logic controller and module difference was S7-200 belonging to the basic entry level, while S7-300 and S7-400 relative to the use of higher-end. Siemens plc is the serial number of the product.---->S7 200: in the electric control system for small, focused on logical control;---->S7 300: for larger … Continue reading The difference between Siemens PLC and S7-300 S7-200, S7-400
S7-300/400 PLC Indirect addressing
Using local variables DWORD LD20 as a pointer, the pointer address is P#4.3. Statement form can be INDIRECT when the status monitor (indirect) pointer address LD20 4.3. M [LD 20] corresponds to the actual address is M4.3.
S7-300/400PLC pulse method
Method one: CPU clock memoryCPU in the hardware configuration properties "Cycle/Clock Memory" in the "Clock Memory" setting the Memory Byte, you can look at to help, each one having a fixed frequency "Propreties" window click on the "Cycle/Clock Memory" (loop memory/clock) tab, you can set the "Scan cycle monitoring time" ( Scanning cycle monitoring time … Continue reading S7-300/400PLC pulse method
The difference between Simens PLC programming FB and FC
FB--function blocks, blocks with background dataFC--function, or functionThey Zhijian of main difference is: FC using of is shared data block, FB using of is background data block lift a example, if you to on 3 a parameter same of motor for control, so only need using FB programming plus 3 a background data block on … Continue reading The difference between Simens PLC programming FB and FC
PLC ladder diagram programs statement that corresponds to the table program
According to the following ladder diagram programs write statements that correspond to table program
Normally closed contact Input signal Processing circuit and PLC ladder diagram
In these input signals can only be provided by a normally closed contact, Figure 1a is to control the motor run relay circuit, SB1 and SB2 start button and stop button, respectively, if they are normally open contacts connected to PLC input, type contacts in the ladder diagram with exactly the same figure 1a. If … Continue reading Normally closed contact Input signal Processing circuit and PLC ladder diagram
Pulse output (PLS/PLF) instructions
PLS (pulse) rising differential outputPLF (pulse) down along the differential output
PLC Timer Three basic usage
Basic usage of timers(1) TCDescription: X0 after 2s, Y0(2) loss delay faultFigure 3 power failure delays broken ladder diagram and sequence diagramNote: when X0 is ON, the normally open contact closure, Y0 connected and self-preservation; when X0 is off, the timer start time delay when X0 when time reaches the time timer setting is removed, … Continue reading PLC Timer Three basic usage
FX2 series PLC stepping sequential control instruction
FX series PLC 2 step instructions there are two: stepping contact instructions step and STL RET return instructions.1, STL: stepping contact instructions Ladder diagram symbolsSignificance of STL instructions to activate a State. Reflected in the ladder diagram from the bus status led on points. STL function of instruction established a bus, so that the State … Continue reading FX2 series PLC stepping sequential control instruction
PLC ONE 