S7-200 series PLC counter (CTUD) instruction
Tag: PLC ladder
S7-200 series PLC timer instructions
（1） TON（2） TOF （3） TONR
S7-200 series PLC compare instruction
SIEMENS S7-200 programming software in the STEP-7, a special compare instruction: IN1 and IN2 to compare the two data types can be B, I (W), D, R, that is, byte, word, integer, double word integers and real numbers; you can also have other comparative:>, <, ≥, ≤, , and so on. When the comparison … Continue reading S7-200 series PLC compare instruction
Siemens S7-200 series PLC LAD STL instruction Ladder Diagram
Gray Code Converion in Ladder Logic
Gray Code Converion in Ladder Logic
two timers ladder logic program
There are two timers here, T4:0 and T4:3 each have a name given to them by the programmer
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
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 Timer delay time extension
Timer has a maximum time of the time, such as 100ms timer maximum timer time is 32767.7s. As in the project delay time is greater than the value that you want to do, one of the most simple method is to use a timer relay, that is to start a timer time, time time to … Continue reading PLC Timer delay time extension
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
PLC ONE 