PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1794-TB37DS is a FLEX I/O Terminal Base designed for modular distributed I/O systems. It provides physical mounting and electrical termination for compatible FLEX I/O series modules. A 37-pin D-shell connector handles field wiring terminations directly or through pre-wired cable assemblies. The base connects directly to adjacent FLEX I/O adapters or terminal bases via an integrated Flexbus connector. Internal bus contacts establish backplane communication and distribute power across the I/O rack.
This unit supports up to 10 A total module current with a maximum 5 A rating per individual pin. Engineers can snap the terminal base directly onto a standard 35 by 7.5 mm steel DIN rail. An integrated mechanical keyswitch aligns with the installed I/O module to prevent incorrect hardware insertion. Optional D-shell distribution boards can mount directly to provide discrete channel connection ports.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
|---|
| Product Type | D-Shell Terminal Base Unit |
|---|
| Connector Type | 37-pin D-shell connector |
|---|
| Module Current Capacity | 10 A maximum per module |
|---|
| Current Rating Per Pin | 5 A maximum per pin |
|---|
| Continuous-Voltage Withstand | Dependent on installed module |
|---|
| Operating Temperature | 0 to 55 °C (32 to 131 °F) |
|---|
| Storage Temperature | -40 to 85 °C (-40 to 185 °F) |
|---|
| Relative Humidity | 5 to 95% noncondensing |
|---|
| Operating Vibration | 5 g at 10 to 500 Hz |
|---|
| Operating Shock | 30 g |
|---|
| Non-Operating Shock | 50 g |
|---|
| Terminal Screw Torque | 5 lb-in (0.6 Nm) |
|---|
| Conductor Size | 12 AWG (4 mm²) stranded copper rated at 75 °C or higher |
|---|
| Enclosure Type Rating | Open-style (Pollution Degree 2) |
|---|
| Mounting Type | 35 x 7.5 mm DIN rail or panel mount |
|---|
TECHNICAL INFORMATION
Features
- Integrated 37-pin D-shell connector provides high-density field wiring termination.
- Module keyswitch prevents accidental insertion of incorrect I/O modules.
- Flexbus backplane connectors establish inter-module communication across the DIN rail.
- Supports snap-on mounting on standard 35 by 7.5 mm DIN rails.
- Current rating allows up to 10 A per module and 5 A per pin.
- Compatible with optional front-mounted analog distribution boards.
TECHNICAL INFORMATION
Applications
- High-density control cabinets requiring pre-wired cable harnesses.
- FLEX I/O distributed automation architectures.
- Analog and digital signal connection points in industrial processing.
TECHNICAL INFORMATION
Connections / Interfaces
- One 37-pin female D-shell connector for field I/O wiring.
- Female Flexbus sliding connector for upstream backplane coupling.
- Male 16-pin Flexbus connector for downstream module expansion.
- Integral screw clamp terminals for +24V DC user power connections.
TECHNICAL INFORMATION
Installation Guidelines
- Mount the unit onto zinc-plated yellow-chromate steel DIN rail to ensure grounding.
- Hook the top lip onto the DIN rail and press down until locked.
- Slide the terminal base tightly against the adjacent module without forcing the hooks.
- Gently push the female Flexbus connector into the adjacent adapter to complete the backplane.
- Do not remove or replace a terminal base while electrical power is applied.
- Torque distribution board terminal screws to 5 pound-inches (0.6 Nm).
TECHNICAL INFORMATION
Configuration Guidelines
- Rotate the mechanical keyswitch to match the requirement of the specific module.
- Verify the pinout assignments in the module manual before terminating field wires.
TECHNICAL INFORMATION
Compatibility
- Compatible with Allen-Bradley FLEX I/O digital input modules including 1794-IB8, 1794-IB16, 1794-IB8S, and 1794-IV16.
- Compatible with FLEX I/O digital output modules including 1794-OB8, 1794-OB16, 1794-OV16, and 1794-OW8.
- Supports analog I/O modules including 1794-IE8, 1794-OE4, 1794-IF4I, 1794-OF4I, and 1794-IE4XOE2.
- Accepts optional 1794-TB37EXD4VM8 and 1794-TB37EXD4CM8 distribution boards for isolated analog signals.
TECHNICAL INFORMATION
Lifecycle / Replacement Information
- Observed alternative catalog designations include revision-marked part number 1794-TB37DS/A.
TECHNICAL INFORMATION
Compliance and Certifications
- CSA certified for process control equipment.
- CE marked in compliance with European Union 89/336/EEC EMC Directive.
- Complies with EN 61000-6-4 and EN 61000-6-2 industrial standards.
- C-Tick compliant with AS/NZS CISPR 11 industrial emission limits.
TECHNICAL RESOURCES
Documentation
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSCompatible with Allen-Bradley FLEX I/O digital input modules including 1794-IB8, 1794-IB16, 1794-IB8S, and 1794-IV16. Compatible with FLEX I/O digital output modules including 1794-OB8, 1794-OB16, 1794-OV16, and 1794-OW8. Supports analog I/O modules including 1794-IE8, 1794-OE4, 1794-IF4I, 1794-OF4I, and 1794-IE4XOE2. Accepts optional 1794-TB37EXD4VM8 and 1794-TB37EXD4CM8 distribution boards for isolated analog signals.
Verify compatibility against the exact Part Number, revision and manufacturer documentation before ordering.
PART VERIFICATION
Before You Order
Industrial automation parts can share similar model names, suffixes and revisions. Confirm the complete manufacturer Part Number before purchase.
01Check Part NumberMatch the complete ordering code on the existing unit.
02Confirm RevisionCheck suffix, hardware or firmware when applicable.
03Send a Label PhotoWe can review a clear label photo when identification is uncertain.
ORDERING PROCESS
From RFQ to Dispatch
1Submit Part Number2Verify Product Identity3Confirm Stock & Condition4Issue Quotation5Dispatch & Tracking
PRODUCT FAQ
Frequently Asked Questions
What type of field wiring interface does the 1794-TB37DS use?
It features a 37-pin D-shell connector for terminating field wiring directly or through pre-wired cable sets.
What is the maximum current capacity of the 1794-TB37DS?
The terminal base supports up to 10 A per module, with a 5 A maximum rating per individual pin.
Can the 1794-TB37DS be installed on any DIN rail?
Rockwell recommends zinc-plated yellow-chromate steel DIN rail to ensure proper chassis grounding.
What is the reference market price for the 1794-TB37DS?
Observed market reference pricing is around $72.00 USD for refurbished condition. This is an indicative market reference only, not a final quotation.
