plc program
① set and reset. When the condition becomes "ON", the set will be put in operation "ON", but not as output (OUT), when the condition becomes "OFF", the reset will not reset on the operation of "OFF". When the condition becomes "ON", the reduction in operation position reset "OFF", but does not output non-directive … Continue reading PLC ladder programming Instruction control bits
Three conveyor belts, respectively, by the motor M1, M2, M3 driven.Requirements: After pressing the start button SB1, a startup sequence for M1, M2, M3, interval of 3s.After the stop button SB2, Sequential stopping for M3, M2, M1, interval of 3s.Three motors M1, M2, M3, respectively, through the contactor KM1, KM2, KM3 three-phase AC power supply … Continue reading Siemens S7-200 PLC’s Belt conveyor Control Programming Example
When I0.0 changes from 0 to 1, T102 normally closed contact closure, T101 is started and start time: When the T101 SV reaches the set PT (50 × 100ms = 5s), T101 is turned on, T101 normally open contact closure, T102 is started, the start time; When the T102 current value of SV reaches its … Continue reading Siemens S7-200 PLC Duty Cycle Adjustable of the pulse source Programming Example
An electrical start of the conveyor belt, At the beginning of the conveyor belt has two push button switches: S1 for START and a STOP of the S2.At the end of the conveyor belt also has two buttons switches: the S3 for START and STOP for the S4. You can start or stop the belt … Continue reading Siemens S7-300 plc’s Controls Belt Programming Example
Timer may constitute a pulse generator with two timers generate a pulse duty cycle of the signal frequency can be set. When the input I0.0 is 1, Output Q0.0 is 0 or 1 alternatelyPeriodic pulse signal for 3s, the pulse width is 1s.
When X0 is turned on, Y0 bright lights;After 5s,Y0 lights off,Y1 bright lights;After 5s,Y1 lights off,Y2 bright lights,After another 5s,Y2 lights off,Y0 bright lights,Cycle through this sequence
There are three motors M1, M2, M3, press the start button to start M1, M2 starts after delay 5s, M3 starts after 16s.
The program uses a CPU Clock memory, Setting MB100 clock memory, the M100.0 change cycle is 0.1s. Enter the symbol address As I0.1, I0.1 positive edge down counter C0 to set the number, if I0.0 is 1, C0 minus 1 per 0.1s. Output symbol address Q0.0.
(1) control requirements. Freedom using a timer to set the clock pulse generator function (pulse duty factor 1: 1). (2) FC1 variable declaration table FC1 ladder program OB1 calls ladder program
00002,01600 fault information input, 00005 for the reset button, HR0000 is the state holding register 10000 for the fault display. When a fault 10,000 to ON10s.
PLC ONE 