By calling the SFC 32 starts. SFC 32 o'clock to provide arguments is called.OB-NR delay interrupt OB numbersDTIME delay length (1 to 60000ms)SIGN extended into OB OB called startup information signsRET-VAL OB the error code if an error occurs during the execution ofDelay interrupts SFCSFC32 SRT_TINT start delay interruptsSFC33 CAN_DINT cancel delay interruptsSFC34 QRY_TINT query … Continue reading Delay interrupt OB 20- Siemens S7-300 PLC organization block OB
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Day interrupt (OB10) – Siemens S7-300 PLC organization block OB
OB10 can be run according to the following intervals:Once (once): only once at a specific date and time.Every minute: starting from a specific date and time, once per minute.Hourly: starting from a specific date and time, once per hour.Daily: starting from a specific date and time, once a day.Weekly: starting from a specific date and … Continue reading Day interrupt (OB10) – Siemens S7-300 PLC organization block OB
Siemens PLC cycle right and left shift instruction
Rotate the end to end the shift data storage unit, while connected to the overflow flag SM1.1, SM1.1 is used to store the bit shifted out.(1) cyclic left shift instruction (ROL)Enable input is active, the number of non-IN input (byte, word, or double word) Rotate Left N-bit symbols, the result is output to the memory … Continue reading Siemens PLC cycle right and left shift instruction
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
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
PLC differential circuit
Rise differential differential circuit and the falling edge of differential pulse circuit, discussed below.Rose along differential pulse circuit, PLC is to cycle scan way work of, in PLC first times scan Shi, entered X0 by OFF into ON Shi, M100, and M101 coil connected, but in first line of M101 of often open touch points … Continue reading PLC differential circuit
Using PLC to realize any of the input signal frequency
Using PLC to realize any of the input signal frequencyFrequency pulse signal applied on the X0 side, in the first pulse arrives, a scanning cycle pulse M100, M100 normally open camp, closed a scanning cycle. Determine the condition that Y0 Y0 State set to 0, M100 set to 1.Y0 in the conditions of work in … Continue reading Using PLC to realize any of the input signal frequency
PLC programming elements timer
Timer is equivalent to relay time relay in the circuit may delay control in your program. FX2 series programmable controller has the following four types of timer.100ms timer: T0~T199 200 timing ranges: 0.1~3276.7 sT200~T245 46 10ms timer timing range: 0.01~327.67 s1ms totalizer timers T246~T249 4 (interrupt) time range 0.001~32.767 s100ms totalizer timer T250~T255 6 timer … Continue reading PLC programming elements timer
Mitsubishi FX2N PLC instructions- four-storey elevator control system
1~4 the stairs outside the request button, FU, FD;1~4 floor SQ1~SQ4 floor signals;In the boot button on the control panel signals;Elevator door opening and closing limit switch.Output signal:Lifting light,Elevator lift AC contactor KM1~KM2,Elevator door AC contactor KM3~KM4,The Bell.1. upon the request 1-4 outside staircase and elevator operation status timely response:Increase process, floor upstairs along the … Continue reading Mitsubishi FX2N PLC instructions- four-storey elevator control system
Mitsubishi FX2N PLC instructions-examples. Buck three-phase motors start
Buck three-phase motor starting. When wound asynchronous motor starting, stator voltage starting is often used, while the rotor circuit access rheostat,KM4R1Input signal 3, SB1, SB2, FR;
PLC ONE 