Design a PLC Ladder Logic for Chemical Mixing Process. We have RSLogix 500 PLC Programming software to create PLC logic and its simulation.
| S.no | Address | Name | Input/output |
| 1 | I:0/0 | Start | Input |
| 2 | I:0/1 | Stop | Input |
| 3 | I:0/2 | Sensor 2 | Input |
| 4 | I:0/3 | Sensor 1 | Input |
| 5 | O:0/1 | Liquid A inlet Valve 1 | Output |
| 6 | O:0/1 | Liquid B inlet Valve 1 | Output |
| 7 | O:0/2 | Stirrer Motor | Output |
| 8 | O:0/3 | Outlet Valve | Output |
| 9 | B3:0 | Memory bits | Memory |
Latching rung to operate the system through Master Start and Stop PB.
To turn on liquid A input valve using memory bit of start latching PB, it will automatically turn off once Sensor 2 activates
To turn on liquid B input valve using Sensor 2 activation, it will automatically turn off once Sensor 1 activates
To store the status of Sensor 1, memory bit is used.
On delay timer is used to run the stirrer motor for 10 sec .
On delay timer is used to Outlet valve for 10 sec .
Program runs continuously until STOP PB is pressed.
The above explained Chemical Mixing process is for example only. It may vary from real time. We can use this example program to understand the working of timers, memory bit and interlocking concept function in AB PLC.
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