Allen-Bradley 150 Series SMC Flex Modules - 150-FS1FX

Technical Dossier

Product Details And Specifications

Allen-Bradley 150 Series SMC Flex Technical Notes

The Evolution of 150 Series Architecture

The 150 Series product line was introduced by Allen-Bradley in the early 1990s as a successor to discrete electromechanical reduced-voltage starters. The original 150-A and 150-B control modules established the baseline architecture: a microprocessor-based control board interfacing with SCR (silicon-controlled rectifier) power stacks via an isolated gate-drive circuit. The 150-C generation introduced expanded parameter memory and RS-485 serial communication capability, enabling integration with early DH-485 and DeviceNet networks.

The SMC Flex designation — introduced with the 150-F series — represented a significant architectural revision. The 150-F platform added a 32-bit control processor, expanded I/O (four programmable inputs, two relay outputs), onboard PTC/thermistor motor protection, and native DeviceNet communication via the 150-SM2 adapter slot. The 150-F series also introduced the bypass contactor integration option, allowing the SMC Flex to operate in a full-voltage bypass mode after motor acceleration, reducing thermal stress on the SCR stack during steady-state operation.

Compatibility constraints exist between generations: 150-A/B power sections are not interchangeable with 150-F control modules due to differing gate-drive signal protocols. The 150-F series communication adapters (150-SM2, 150-SM3) are not backward-compatible with 150-C series chassis. Facilities migrating from 150-C to 150-F must account for wiring changes at terminals 1–14 and reconfiguration of parameter sets via DriveExplorer or Studio 5000 Logix Designer.

As of 2024, the 150-F series is classified by Rockwell Automation as Active — Mature, with no new feature development planned. The recommended migration path for new installations is the Allen-Bradley SMC-50 (150-F5 series), which offers EtherNet/IP native communication and expanded diagnostic capability. However, the 150-F installed base remains extensive, and long-term spare parts support is the primary operational requirement for most end users.

150 Series Full Catalog & Functionalities (SKU List)

The following SKUs represent the core module range of the Allen-Bradley 150 SMC Flex Series, organized by functional category. Each model is a discrete, field-replaceable component.

Control Modules

• 150-FS1FX: SMC Flex control module, 3–200 A range, standard I/O, no communication adapter
• 150-FS2FX: SMC Flex control module, 201–400 A range, extended current rating variant
• 150-FS3FX: SMC Flex control module, 401–900 A range, high-current industrial applications
• 150-F5NBD: SMC Flex control module with DeviceNet communication pre-installed
• 150-F5NED: SMC Flex control module with EtherNet/IP adapter integrated
• 150-F5NCD: SMC Flex control module with ControlNet communication adapter

Communication & Network Adapters

• 150-SM2: DeviceNet communication adapter for SMC Flex, plug-in module format
• 150-SM3: ControlNet communication adapter for SMC Flex series
• 150-SM4: EtherNet/IP communication adapter, 10/100 Mbps, dual-port
• 150-SM5: PROFIBUS DP communication adapter for SMC Flex

I/O & Expansion Modules

• 150-SB1: Bypass contactor module, integrates with SMC Flex for full-voltage bypass operation
• 150-SB2: Bypass contactor module, higher current rating variant for 400–900 A frames
• 150-SA1: Analog output module, 4–20 mA current output for speed/torque monitoring

Power & Ancillary Components

• 150-PS1: 24 VDC auxiliary power supply module for SMC Flex control section
• 150-C25NBD: Legacy 150-C series control module, DeviceNet, 25 A rating (predecessor generation)
• 150-C43NBD: Legacy 150-C series control module, DeviceNet, 43 A rating
• 150-C85NBD: Legacy 150-C series control module, DeviceNet, 85 A rating

Quality Control for the 150 Series Range

The Allen-Bradley 150 SMC Flex series presents specific quality control requirements due to its SCR-based power architecture and multi-board control assembly. DriveKNMS applies the following verification protocol to all 150 Series units processed through its facility:

• Visual inspection: PCB surface examination for capacitor bulge, trace corrosion, and connector pin deformation on the 14-pin control interface and communication adapter slot.
• SCR gate-drive test: Verification of gate-cathode trigger voltage and latching current for each SCR in the power stack, using a calibrated curve tracer.
• Control module functional test: Full parameter read/write cycle via DriveExplorer software, verification of all four programmable inputs and two relay outputs under simulated load conditions.
• Communication adapter verification: For 150-SM2 (DeviceNet) and 150-SM4 (EtherNet/IP) adapters, node commissioning test on an isolated network segment to confirm MAC ID assignment, baud rate negotiation, and I/O assembly mapping.
• Thermal cycling: Units subjected to 0–55°C thermal cycle (IEC 60068-2-14 compliant) prior to final release, confirming solder joint integrity on high-density BGA and PLCC packages.
• Final burn-in: 48-hour powered soak at rated voltage with periodic parameter polling to confirm operational stability before dispatch review.