Paint factory example with RSLogix 500 | Timer example | PLC PROGRAMMING TUTORIAL FOR BEGINNERS
2,789 views · Published 4 September 2018 · 8:09 · Indexed 30 September 2026
Channel: WsCube Tech · 2018 · Education
Basics of PLC timer-
PLC timers are instructions that provide the same functions as on-delay and off-delay mechanical and electronic timing relays. A PLC timer provides a preset delay to the control actions.
In general, there are three types of PLC timer delays, ON-delay timer, OFF-delay timer and retentive timer on.
#Timer_Example #RSLogix500 #PLC_Programming #PLC_Ladder_logic
The terms represented in the timer block in the PLC are a Preset value which means the delay period of the timer, an Accumulated value which is the current delay of the timer.
A timer begins the counting on time-based intervals and continues until the accumulated value equals the preset value. When the accumulated value equals the preset time the output will be energized. Then the timer sets the output.
Example of timer-
Paint factory:-
Control Purpose:
There are pigments of 3 colors.
By controlling different switches,
operators can fill the cans
With corresponding pigments.
Device Function:
X0 Filling Start switch. X0 will be ON when turned on.
X1 Yellow control switch. X1 will be ON when turned on.
X2 Blue control switch. Turn it on, X2 will be on
X3 Green (mixing of yellow and blue) control switch. X3 will be ON when turned on
Y0 Yellow control valve
Y1 Blue control valve
Program Description:
The master switch of filling control needs to be turned on (X0 = ON) before filling started.
When both yellow and blue are filled at the same time, it will become green.
When the switch of filling yellow pigment is turned on, X1 = ON. The first MC ~ MCR
Instruction will be executed. Y0 = ON, and the system begins to fill the yellow color.
When the switch of filling blue pigment is turned on, X2 = ON. The second MC ~ MCR
Instruction will be executed. Y1 = ON, and the system begins to fill the blue color.
When the switch of filling green pigment is turned on, X3 = ON, both of the two MC ~ MCR Instructions will be executed, and the system begins to fill the green color.
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