Overview
The Turck RKE 57-TR2 is a DeviceNet bus termination resistor designed for CAN and CANopen fieldbus applications in industrial automation systems. This device features a 5-pin M12 × 1 female connector with a built-in 120 Ω, 1/2 W terminating resistor on pins 4 and 5, providing the impedance matching required to eliminate signal reflections and maintain data integrity on DeviceNet and CANopen networks.
Key Features
- 5-pin M12 × 1 female connector (Eurofast type, large plug body)
- 120 Ω, 1/2 W internal resistor on pins 4/5 for proper bus termination
- Rated voltage: 10–30 VDC (max. 7.6 VDC on resistor pins)
- IP68 and IP69K protection rated for sealed, submersible environments
- NEMA ratings: NEMA 1, 3, 4, 6P for harsh industrial use
- Nickel-plated brass coupling for corrosion resistance and reliable connections
- Operating temperature range: −40 °C to +80 °C
Technical Specifications
| Specification | Value |
| Manufacturer | Turck |
| Model / Part Number | RKE 57-TR2 |
| Identification Number | U2251-5 |
| Connector Type | M12 × 1 female (5-pin, Eurofast, straight) |
| Internal Resistor | 120 Ω, 1/2 W (pins 4/5) |
| Rated Voltage | 10–30 VDC |
| Max Voltage on Resistor Pins | 7.6 VDC |
| Protection Class (IP) | IP68, IP69K |
| Protection Class (NEMA) | NEMA 1, 3, 4, 6P |
| Operating Temperature | −40 °C to +80 °C |
| Coupling Material | Nickel-plated brass |
| Body Material | Black moulded polymer |
| Contact Plating | Brass / Gold |
Typical Applications
- DeviceNet network termination in industrial control systems
- CANopen fieldbus line ending resistor
- Distributed I/O systems and sensor networks requiring impedance matching
- Food & beverage processing plants with wash-down / wet environments
- Automotive manufacturing lines
- Machine tool networks and production equipment
- Hazardous location facilities requiring sealed connectors
Compatibility & Replacements
Compatible With
- DeviceNet master nodes and slave devices
- CANopen fieldbus segments
- Any M12 5-pin female connector socket (straight mating)
- Industrial PLC and motion control systems supporting CAN protocols
- Turck Tben-S1, Tben-S2, and other Turck gateway modules with M12 interfaces
Replaces / Drop-In Replacement For
- Verify compatibility with your system integrator before ordering. The RKE 57-TR2 is a standard Turck termination resistor; confirm any legacy model equivalence with your procurement team.
Works With
- DeviceNet protocol (ODVA-compliant)
- CANopen (CiA 301)
- M12 connector ecosystems (Turck, Phoenix Contact, Lapp, LEMO)
- Any fieldbus gateway or node supporting standard 120 Ω terminating impedance
