1, MPI is a Multi-Point Interface, suitable for PLC 200/300/400, operator Panel PC MPI/PROFIBUS and TP/OP communication card, supported MPI network communication speed for the network communication speed of 12Mbit/s. MPI network can connect up with 32 nodes, maximum communication distance is 50m, but can use repeaters to extend the length.PPI Protocol is a communications … Continue reading ppi_mpi_profibus
Tag: plc basics
SIEMENS S7-300 PLC control 3 lights Turn on Programming examples
This is siemens plc s7-300 Cycle execution Programming examples When the X0 on, the lamp Y0 on ; after 5S, the lamp Y0 off, the lamp Y1 on ; after 5S, the lamp Y1 off, the lamp Y2 on, and then after 5s , the Y2off, the lamp Y0 on, cycle….plc ladder diagram
Siemens S7-300 plc counter becomes timer programming examples
Siemens PLC programming, how to use clock memory, extended to timer, which is plc programming examples, explains how to write ladder diagram In the programming use CPU memory clock,Setting MB100 clock memory, the M100.0 change cycle is 0.1s.Enter the symbol for the address I0.1, I0.1 positive edge down counter C0 to set the number, if … Continue reading Siemens S7-300 plc counter becomes timer programming examples
FX2N PLC programming Initial state
learn plc programming we can use Status at the start position of the state transition diagram ，That is the initial state, the S0~ S9 can be used as the initial conditionInitial state is originally from the STOP PLC to RUN switching instantaneous action of the special auxiliary relay M8002 driver, so that the S0 set … Continue reading FX2N PLC programming Initial state
PLC control Three phase asynchronous motor Positive inversion
this is three phase asynchronous motor positive and reverse relay contactor control operation circuitKM1 for the motor to run the AC contactor,KM2 for the motor reverse running AC contactor,SB2 is the positive turn button,SB3 to reverse the start button,SB1 for stop button,FR for thermal protection relay.When the SB2 is pressed,KM1 coils pull,KM1 main contact closure,The … Continue reading PLC control Three phase asynchronous motor Positive inversion
Design principles of ladder diagram in PLC programming
So-called empirical method, programming is the use of one's own or others ' experience. This method requires the user to be familiar with basic circuit conditions, grasp the basic principles of the design of ladder diagram and the programming skills, so that programs adapted for the requirements of their program experience.1) ladder diagram of each … Continue reading Design principles of ladder diagram in PLC programming
Circuit type of PLC parsing programming
If understood as PLC ladder diagram circuit, judging from the perspective of the relationship between the input and output are both combinational and sequential circuits, if according to the input of the deterministic case, circuit and random circuits have two.(1) combination circuitOutput only with the input of the current situation, regardless of the input history … Continue reading Circuit type of PLC parsing programming
PLC programming steps with analytical method
Principles of uniqueness to the design of ladder diagram, or PLC programming increased constraints, starting with design and programming but also to bring ideas.The analytical program described here is to start from the principle of analysis only, specific steps are:1) column to the original source for the meter: according to the PLC the object of … Continue reading PLC programming steps with analytical method
Mitsubishi FX2N series PLC pulse output commands PLS/PLF
① PLS Pulse rise time differential output directive, PLF is a pulse differential output decline. PLS and PLF command can only be used for the output relay y and auxiliary relay m (does not include special auxiliary relays).② M0 X0 normally open from open to close (X0 rising edge) when a scan cycle for ON;M1 … Continue reading Mitsubishi FX2N series PLC pulse output commands PLS/PLF
Mitsubishi FX2N series PLC pulse contact instructions LDP/LDF/ANDP/ANDF/ORP/ORF
① LDP, ANDP and ORP directive is used for the rising edge detection of contact orders, contact with an upward arrow in the Middle, the corresponding contact only at the rising edge of the specified element (from OFF to ON), through a scanning cycle.② LDF, ANDF and ORF falling edge detection is the instruction for … Continue reading Mitsubishi FX2N series PLC pulse contact instructions LDP/LDF/ANDP/ANDF/ORP/ORF
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