Motion and state
Its travel is animated along the validated local axis and can expose command and end-state feedback.
PLC control pattern
Commission it by proving extended limit, retracted limit before accepting extend.
Fault practice
Inject jammed, slow states and require the PLC sequence to detect, stop and recover deliberately.
PLC integration guide
How to use a pneumatic cylinder with a PLC
Build the sequence around command, movement and proof
Model the cylinder with explicit states such as RETRACTED, EXTENDING, EXTENDED, RETRACTING and FAULT. Before extending, confirm the retract command is off and every process permissive is healthy. Issue the extend command once, start a travel timer and advance only when EXTENDED_LS arrives. On timeout, stop dependent motion and report which command lacked which proof. This state-based pattern is easier to diagnose than scattered set/reset coils.
Understand single- and double-solenoid behaviour
A single-solenoid spring-return valve moves to its normal state when its coil loses power. A double-solenoid valve may retain its last spool position, so turning both PLC outputs off does not necessarily return the actuator. Interlock opposing coils in logic and, where the hardware requires it, electrically. Define the intended state after controller restart, loss of air and emergency stop instead of relying on the last command bit.
Treat speed, force and trapped energy as physical issues
Cylinder force depends on pressure and effective piston area, while speed depends on airflow, restrictions and load. PLC timing can detect abnormal travel but cannot compensate safely for poor sizing or an unstable pneumatic circuit. Meter-out flow control often produces steadier movement. Vertical loads and stored air can continue moving after electrical power is removed, so risk controls must address the pneumatic energy itself.
Learn the physical principle first
The reference above focuses on PLC integration. The interactive school lesson shows the device, signal or mechanism before you write the control sequence.
See the cylinder cutaway and airflow labSignal map
I/O you can reason about
PLC output Extend; PLC input Extended limit; PLC input Retracted limit
| Signal | PLC direction | Type / range |
|---|---|---|
| Extend extend | output | bool |
| Extended limit extended | input | bool |
| Retracted limit retracted | input | bool |
Field checklist
Commissioning sequence
- 01Jog the valve manually with the machine made safe and confirm porting, direction and mechanical clearance.
- 02Observe both end switches and adjust them to change reliably at the true end positions.
- 03Command each direction separately and verify opposing outputs can never be on together.
- 04Measure normal loaded travel times over repeated cycles and set timeouts with justified margin.
- 05Test low air, a blocked actuator and missing end feedback; verify the fault names the failed movement and requires deliberate recovery.
Fault finding
Symptoms and first checks
| Symptom | Check |
|---|---|
| Output is on but cylinder does not move | Check supply pressure, isolation valve, coil voltage, manual override, spool movement, exhaust restriction and mechanical binding. |
| Cylinder moves but never completes the PLC step | Check end-sensor position, wiring, input address and whether the sequence expects the opposite limit. |
| Motion is jerky or too fast | Inspect flow-control direction, cushioning, side load, pressure stability and cylinder sizing before changing PLC timers. |
Fault and recovery exercise
Make abnormal states part of the sequence
Inject jammed, slow states and require the PLC sequence to detect, stop and recover deliberately.
jammedslow
Engineering boundary
The model teaches PLC sequence behaviour and diagnosis. Confirm ratings, wiring, guarding, process calculations and commissioning limits against the real manufacturer documentation and site design.
Plain-English answers
Pneumatic cylinder FAQ
Should a PLC control a pneumatic cylinder with timers only?
No. Use end-position feedback for normal completion and a timer as a fault limit. A timer-only sequence cannot distinguish completed travel from a stalled actuator.
What happens to a cylinder when power is lost?
It depends on valve construction, load, air circuit and stored pressure. A spring-return valve may drive it toward one state; a double-solenoid valve may remain where last commanded. Engineer the safe behaviour explicitly.
Why can both cylinder limit switches be on?
Possible causes include poor sensor adjustment, magnetic-field overlap, a wiring short or incorrect tag mapping. Treat an impossible combination as a diagnostic fault.
Free first success
Put the pneumatic cylinder into a working control sequence
Open a related browser scenario, run the PLC logic and see the component state respond. Start without installing software or entering a card.
No installNo credit cardImmediate pass/fail feedback
Keep building
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