About a Typical Pneumatic Circuit
KVAL 994-X Operation/Service Manual
6-18
4. The PLC senses the voltage from the Extend Sensor and removes the control voltage
to the Control Valve.
Positioning
System
Load
Force
Translated
Positioning
PLC
Instructions
Position Feedback
Extend Sensor:
Retracted Sensor:
Deactivated
Activated
24 Volts
Extended
Cylinder
24 V Applied
Router Assembly (Load)
Position Feed Back
Air In
Control Valve
Extend
Sensor
Activated
Air Pressure Extends
Cylinder and Router
Assembly
EXTENDED
Retract Process
If the PLC determines the conditions are right to retract the Router:
1. The Control Valve directs compressed air to the retract port of the Cylinder.
2.
The Cylinder and Router retract deactivating the Extend Sensor
3.
When the Cylinder and Router are fully retracted, the Retract Sensor is activated.
4. The PLC senses the voltage from the Retract Sensor completing the process
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