FESTO SMT-8M-A-PS-24V-E-0.3-M8D Cylinder Position Sensor

(Magnetic Proximity Switch), used to detect the position of the cylinder piston magnet, embedded installation into cylinder profile T-slot

✅ Definizione del codice modello

📌 Core Electrical Specifications

Principio: Magneto-resistive

Produzione: 3-filo PNP normalmente aperto (NO)

Alimentazione elettrica: DC 5~30V, nominal DC24V

Max output current: 100mA

Max DC switching power: 2.8W

Caduta di tensione: ＜1.5V

Precisione di ripetizione: ±0.1~0.2 mm

Switching time: Ton ≤1.3ms / Toff ≤1.4ms

Frequenza di commutazione massima: 180Hz

Protezione: Protezione da cortocircuito, protezione da sovraccarico, full-pin reverse polarity protection

🌡️ Environmental Specifications

Temperatura ambiente: -40℃ ~ +85 ℃ (ampio intervallo di temperature, excellent for low-temperature applications)

Materiale: Halogen-free, oil resistant; CE/UKCA/UL/RCM certified, Conforme alla direttiva RoHS

Montaggio: Inserimento dall'alto nella scanalatura a T, flush with profile, supplied with cable clip and label

🔌 M8 Pin Assignment (3-nucleo)

1. Marrone: DC+ Positive Power
2. Blu: DC0V negativo
3. Bianco: Uscita segnale PNP

🎯 Typical Applications

Festo standard cylinders: DSBC, DNC, ADN, DSNU and other T-slot profile cylinders

Casa / end position detection for cylinders on automated production lines

Low-temperature equipment, robotic drag chain wiring (E-type cable for repeated bending)

⚠️ Model Selection & Linee guida per la sostituzione

1. Output code definition: PS=PNP Normally Open; NS=NPN Normally Open; PO=PNP Normally Closed; NO=NPN Normally Closed
2. Inter-series replacement: SME is older Hall-effect type; SMT-8M-A is new magnetoresistive version with superior low-temperature performance
3. Connector suffix distinction: M8D (Spina M8) / M12 (Spina M12) / OE (open bare cable end)
4. Nota importante: Sensor must work with built-in permanent magnet on cylinder piston; no signal without magnetic ring

📦 Order Code

SMT-8M-A-PS-24V-E-0.3-M8D：574334

❗ Common Troubleshooting

No signal: Check existence of cylinder magnet ring, sensor mounting position, M8 connector pins; verify supply voltage 5~30V

Fluctuating signal: Loosely clamped sensor in T-slot, degraded magnet ring, strong electromagnetic interference on cable

Insufficient load drive capability: Load current＞100mA; PNP load shall be wired between signal output and 0V

Domestic Compatible Replacement List

(Compatible with SMT-8M-A-PS-24V-E-0.3-M8D, Scanalatura a T, PNP n, 3-filo, drag-chain flexible cable, M8 3-pin straight connector, 0.3M)

Core specs of original model: Top-load T-slot, magnetoresistive electronic type, DC5~30V, PNP n, max 100mA, drag-chain resistant TPE cable, M8 3Pin A-coded straight connector, IP67, Indicatore di stato LED

Classificazione: Perfect replacement (identical mechanical & electrical dimension + drag-chain cable, scambio diretto) / Engineering replacement (universal T-slot, standard cable, cost priority)

✅ Perfect Direct Replacement

(Identical mechanical dimension, drag-chain resistant TPE cable, Connettore M8, direct swap without slot modification or program change)

⚠️ Critical Notes for Replacement Selection

1. Principle distinction: Prioritize magnetoresistive electronic type, avoid reed switch; reed switch has short service life and false triggering under vibration, cannot match performance of SMT-8M-A
2. Meaning of suffix E: Original suffix E = drag-chain cable for repeated robotic bending; if cable runs inside drag chain, must select version marked E / TPE flexible cable. Ordinary PVC cable will crack quickly.
3. Tipo di uscita: Strictly confirm PNP Normally Open (PS), avoid NPN(NS) o Normalmente Chiuso(P.O); PLC wiring logic will differ completely.
4. Temperatura: Originale: -40~+85℃; ordinary economy domestic version only -20~70℃, select wide-temperature version separately for low-temperature working conditions.
5. Montaggio: T-slot must support top insertion. Older side-loading magnetic switches cannot clip directly into Festo cylinder profile T-slot.

📌 Unified Pin Definition (All above M8 3-pin versions share same pinout as original Festo)

Pin1 Brown: CC 24 V+

Pin2 Blue: 0V

Pin3 White: Uscita segnale PNP

Alternative Bare Cable Version (No M8 connector, open cable end OE)

KCSOR KTS-8M-PS-24V-E-0.3-OE、Kedun KMT-8M-A-PS-24V-E-0.3-OE

Replacement Risk Reminders

Domestic economy models have weaker signal stability under heavy EMI (servo / inverter nearby) compared with original Festo; for high EMI environment, select anti-interference upgraded model from KCSOR/Kedun.

Order remark required when purchasing: Top-load T-slot, magnetoresistive electronic, drag-chain resistant cable, PNP normalmente aperto, M8 3-pin A-coded straight connector, cable length 0.3m

FESTO SMT-8M-A Full Series Model List

(Top-load T-slot magnetoresistive magnetic switch, E=drag-chain resistant cable, DC5~30V)

Base model coding: SMT-8M-A-[Produzione]-24V-E-[Lunghezza del cavo]-[Connettore]

Output Code:

PS: 3-wire PNP Normally Open NO

P.O: 3-wire PNP Normally Closed NC

NS: 3-wire NPN Normally Open NO

NO: 3-wire NPN Normally Closed NC

ZS: 2-filo PNP normalmente aperto

PNS: PNP/NPN commutabile

PSO: PNP NO/NC switchable

Connettore: M8D=M8 3-pin straight plug; M12=M12 3-pin plug; OE=open bare cable end

1. PNP Normally Open PS (Your target model group)

2. NPN Normally Open NS

3. PNP Normally Closed PO

4. NPN Normally Closed NO

5. 2-wire ZS (2-filo PNP normalmente aperto)

6. Multi-function Switchable Models

7. Explosion-proof Version (OE-EX2 for hazardous area)

SMT-8M-A-PS-24V-E-5.0-OE-EX2、SMT-8M-A-NS-24V-E-5.0-OE-EX2

8. Note supplementari
9. Custom cable length available: 0.1~30m; step 0.1m for 0.1~5m; step 0.5m for 5~30m, modify the numeric segment in model for ordering.
10. Unified mechanical feature: all top-load T-slot installation, magnetoresistive, -40~+85℃, IP67, fitted with LED status indicator.
11. Distinguish older SME series: SME adopts Hall element with lower max temperature; SMT-8M-A new magnetoresistive design with better low-temperature performance.

Corresponding Domestic Model List (1:1 mapping for BOM mass replacement)

Marca: KCSOR KTS-8M series / Kedun KMT-8M-A series

KTS-8M-PS-24V-E-0.3-M8D (equivalent to SMT-8M-A-PS-24V-E-0.3-M8D)

KTS-8M-PS-24V-E-0.3-M12

KTS-8M-PS-24V-E-2.5-OE

KTS-8M-PS-24V-E-5.0-OE

KTS-8M-NS-24V-E-0.3-M8D

KTS-8M-NS-24V-E-2.5-OE

KTS-8M-PO-24V-E-7.5-OE

KTS-8M-NO-24V-E-2.5-OE

KTS-8M-NO-24V-E-7.5-OE

KTS-8M-ZS-24V-E-5.0-OE

KTS-8M-PNS-24V-E-0.3-M8D

KTS-8M-PSO-24V-E-0.3-M8D