plc program
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
There are three motors M1, M2, M3, press the start button to start M1, M2 starts after delay 5s, M3 starts after 16s.
LD I0.0 EU ATCH INT_0, 21 ENI LDN M0.0 A I0.0 TON T32, +1000 LD T32 = M0.0 LD I0.0 ED DTCH 21 DISI INT0 LDN Q0.0 = Q0.0
Bytes read instruction immediately (MOV-BIR) reads the actual input IN the 1-byte values, and write OUT the result as the specified storage unit, but the input image register has not been updated.Bytes write command immediately read from the input IN the specified storage unit 1 byte numerical and written (in bytes) of physical output point … Continue reading byte Immediate Read instruction (MOV-BIR)
The highest byte lowest byte and byte swap instruction is used to exchange input word IN
That is the condition for the alarm input X0 X0 = ON alarm requirements.Alarm lamp output Y0, Y1 alarm buzzer.Y0 flashing alarm when its oscillation cycle 1s;Y1 tweet.X1 alarm response, alarm X1 after blinking and stays ON Y0, Y1 tweet closed.X2 is alarm lamp test signal, i.e., Y0 X2 turns ON.①Y0 need an oscillator signal.② … Continue reading PLC alarm circuit Ladder Logic
With a start button QA, a stop button TA D to achieve a motor start, stop control. Its AC contactor for KM. Draw terminal wiring diagram of the control system; lists the I / O allocation table; design ladder.Analysis example1) Terminal Blocks2) I / O assignment Input Output QA-X0 KM-Y0 TA-X1 0 when input contact … Continue reading PLC circuit Program
(1) Shift Register instruction SHRB the DATA value into the shift register. Ladder, EN enable input is connected to the shift pulse signal, each effective when enabled, moving an entire shift register.DATA data input connected binary value shifted into the shift register, the instruction is executed when bit value into register.S_BIT specify the minimum bit … Continue reading Siemens S7 PLC shift register instructions (SHRB) PLC Ladder Logic
PLC ONE 