Sequential operation of two lamps.
Application:-Operate two lamps in sequence. There are two lamps in the system
and we need to operate it in sequence, hence first L1 will be on and after 10s
second L2 will be ON.
Components:-Programmable
logic controller, Electrical panel, wires, 24VDC switch with NO contacts, 24VDC
solenoid valve, and 24 VDC timer.
As per above application,
there are two lamps in the system and we need to operate them in sequence. So
when lamp on/off button is pressed L1 will be on and second lamp L2 will on
after 10 second delay. In this case we need to use on delay timer because we
are giving delay between two lamps.
PLC
program:-
Write the ladder program for above application using
ladder diagram language. Here for ladder logic we can use any supported PLC
system like S7-1200, S7-300, S7-1500 or any other PLC which can support this
instruction. For PLC logic we need digital inputs and outputs.
For our application on/off switch is digital input
and lamps are the digital output. So define digital input address and output
address as per below explanation,
Digital
inputs:-
Digital
Output:-
L1=Q0.0
L2=Q0.1
Memory
Coil:-
On/off switch:-M0.0
PLC
program Explanation:-
In network 1, we have used NO contact of lamp ON/OFF (M0.0), so when
switch is pressed L1 (Q0.0) will be on immediately.
In network 2, we have used NO contact of L1 (Q0.0) to operate L2
(Q0.1). Here we used on delay timer to provide delay between two lamps.