Allen-Bradley 1336 PLUS Series Modules – 74101-772-54(1336T-MCB-SP51B)

Technical Dossier

Product Details And Specifications

Allen-Bradley 1336 PLUS Series Technical Notes

The Allen-Bradley 1336 PLUS series is a family of AC variable frequency drives (VFDs) manufactured by Rockwell Automation, deployed extensively across global heavy industry including petrochemical refineries, nuclear power auxiliary systems, offshore platforms, pulp and paper mills, and cement production facilities. With an installed base spanning multiple decades, the 1336 PLUS and its sub-variants (1336 PLUS II, 1336 IMPACT, 1336 FORCE, 1336T) represent one of the most widely maintained legacy drive platforms in industrial automation. The 74101-772-54 (1336T-MCB-SP51B) is the main control board for the 1336T sub-series, responsible for PWM signal generation, fault diagnostics, and serial communication with the host PLC or DCS.

The Evolution of 1336 PLUS Architecture

The 1336 PLUS platform was introduced in the early 1990s as a successor to the 1336 series, incorporating IGBT switching technology and a modular board architecture that separated the main control board (MCB), power interface board (PIB), and gate driver board (GDB). This separation allowed field replacement of individual boards without full drive replacement — a design philosophy that extended service life significantly in capital-intensive facilities.

The 1336 PLUS II followed with enhanced EMC filtering, expanded I/O options, and support for DeviceNet and Remote I/O communication adapters. The 1336 IMPACT variant introduced sensorless vector control for applications requiring higher torque accuracy at low speed. The 1336 FORCE added closed-loop flux vector control with encoder feedback. The 1336T (Talon) sub-series targeted HVAC and pump/fan applications with a simplified control architecture, of which the 74101-772-54 (1336T-MCB-SP51B) is the primary main control board.

As of 2012, Rockwell Automation formally announced end-of-life for the 1336 PLUS family, transitioning customers toward the PowerFlex 400, PowerFlex 700, and PowerFlex 755 platforms. However, the installed base remains active in facilities where full drive replacement is cost-prohibitive, creating sustained demand for spare boards, repair services, and long-term maintenance support.

1336 PLUS Full Catalog & Functionalities (SKU List)

The following SKUs represent verified components within the Allen-Bradley 1336 PLUS / 1336T / 1336 PLUS II / 1336 IMPACT / 1336 FORCE ecosystem. Each entry reflects a distinct board assembly or module with a defined functional role.

Main Control Boards (MCB)

• 74101-772-54 (1336T-MCB-SP51B): Main control board for 1336T Talon series; PWM control, fault logic, serial comms
• 74101-716-52 (1336-MCB-SP1): Main control board for 1336 PLUS standard frame; base V/Hz control
• 74101-716-53 (1336-MCB-SP2): Revised MCB for 1336 PLUS with enhanced fault diagnostics firmware
• 74101-740-52 (1336S-MCB-SP1): Main control board for 1336 PLUS II series; expanded I/O, DeviceNet ready
• 74101-740-53 (1336S-MCB-SP2): Updated 1336 PLUS II MCB with improved EMI immunity
• 74101-756-52 (1336F-MCB-SP1): Main control board for 1336 FORCE; closed-loop flux vector, encoder interface
• 74101-760-52 (1336E-MCB-SP1): Main control board for 1336 IMPACT; sensorless vector control architecture

Power Interface Boards (PIB) & Gate Driver Boards (GDB)

• 74101-716-01 (1336-PIB-SP1): Power interface board for 1336 PLUS frames A–C; DC bus sensing, precharge relay control
• 74101-716-02 (1336-GDB-SP1): Gate driver board for 1336 PLUS; IGBT firing signals, desaturation protection
• 74101-740-01 (1336S-PIB-SP1): Power interface board for 1336 PLUS II; enhanced current feedback scaling
• 74101-740-02 (1336S-GDB-SP1): Gate driver board for 1336 PLUS II frames D–F

Communication Adapter Modules

• 1336-GM1: Remote I/O (RIO) communication adapter for 1336 PLUS; Allen-Bradley DH+ network integration
• 1336-GM6: DeviceNet communication adapter for 1336 PLUS II; explicit and polled I/O messaging
• 1336-GM7: ControlNet communication adapter; scheduled and unscheduled data transfer
• 1336-GM10: Profibus DP adapter for 1336 PLUS II; 12 Mbps max baud rate

Human Interface Module (HIM) & Peripheral

• 1201-HA2: Full-numeric HIM for 1336 PLUS; parameter programming, fault display, local speed reference
• 1336-MOD-HC2: Brake chopper module for 1336 PLUS; dynamic braking resistor interface

Quality Control for the 1336 PLUS Range

All 1336 series control boards processed by DriveKNMS undergo a structured inspection and functional test protocol prior to dispatch. The 74101-772-54 (1336T-MCB-SP51B) and related MCB assemblies are tested for: DC bus voltage sensing accuracy, PWM output signal integrity across all six gate channels, EEPROM parameter retention, serial communication port continuity (RS-485/RS-232), and onboard power supply rail voltages (+5V, +15V, -15V). Gate driver boards are tested under resistive load conditions to verify IGBT firing timing and desaturation fault response. All boards are inspected for capacitor ESR degradation, cold solder joints on high-vibration connector areas, and corrosion on backplane edge connectors. Units that do not pass all test criteria are quarantined and not listed for sale.