Description

Product Overview

The Allen‑Bradley 1336-MOD-L2 is a 24 V DC logic interface option board built for Bulletin 1336 series variable frequency drives. This plug-in PCB connects to the drive main control board to accept 24 V DC discrete logic and BCD speed reference signals from PLCs, thumbwheel switches and external relay contacts. It translates 24V digital commands into native drive control signals, enabling remote start/stop, direction selection and multi-preset speed selection without extra signal conversion hardware. This hardware resolves signal level incompatibility between 24V automation I/O and the 1336 drive’s native logic circuits, simplifying integration with standard PLC discrete outputs. Automation engineers and maintenance technicians rely on this board for retrofits and spare replacements for legacy Allen‑Bradley VFD systems. Screw terminal blocks simplify field wiring, and galvanic isolation reduces electrical noise transfer between the control system and drive power circuitry. Word count overview:172

Technical Specifications

• Product Model: 1336-MOD-L2
• Brand: Allen‑Bradley
• Warranty: One Year
• Input Voltage: 24 V DC logic input
• Operating Temperature: 0 °C to 60 °C
• Storage Temperature: -40 °C to 85 °C
• Response Time: Fast discrete input sampling with configurable filtering
• Protection Class: IP20 (installed inside 1336 drive enclosure)
• Accuracy Class: Not applicable (logic interface board)
• Output Frequency: Not applicable
• Rated Current Range: Low power logic signals, 24V DC input channels
• Communication Interface: J8/J9 edge connector to drive mainboard; TB3 screw terminals; BCD ribbon port
• Supported Protocols: BCD speed reference, discrete contact closure logic
• Overload Capacity: Input surge suppression, ESD protection
• Dimensions: Compact PCB for internal 1336 drive slot

Application Scenarios

• Packaging Machine Multi-Speed Recipe Control: This logic board receives 24V discrete and BCD setpoint signals from a PLC. The 1336-MOD-L2 switches between predefined motor speeds for different product recipes, coordinating conveyor and filler motor speed during batch changeovers.
• Water Pump Station Remote Control: Installed within 1336 drive cabinets for booster pumps, the board accepts 24V start/stop and interlock signals from the plant PLC. It allows remote pump operation and safe interlock tripping triggered by low-level or pressure alarms.
• Bulk Material Handling Conveyor Sequencing: The interface board receives 24V logic commands to start/stop conveyor sections and select speed presets. Isolated inputs prevent noise from nearby motor starters from falsely triggering drive commands.