Allen Bradley 1745-E153 PLC Modules

Configured for discrete signal expansion and mixed-voltage output driving in SLC 150 programmable logic controller platforms, the Allen-Bradley 1745-E153 (1745-E153 Combination I/O Expansion Unit) provides direct physical/electrical execution across 32 hardwired field points.

Hardware Specifications

Backplane Bus Interconnect & I/O Density Scaling

• Determinism & Bus Execution: The 1745-E153 interconnects directly with the primary SLC 150 base controller via a parallel ribbon cable, extending CPU scan logic across an additional 20 DC input points and 12 AC/DC output points without network protocol latencies.
• Firmware Flash Compatibility & Addressing: Hardware-mapped input and output registers integrate directly into the master controller logic map, maintaining predictable cycle times for time-critical discrete control loops.
• Proximity Isolation & Noise Immunity: Optoisolated 10-30 VDC sinking input circuits and galvanically isolated relay contacts prevent transient field spikes from corrupting backplane communication.

Frequently Asked Questions

Q: Can the 1745-E153 expansion module be plugged in while the primary base unit is energized?

A: No. Hot-swapping is strictly prohibited. Power to the primary controller and expansion chassis must be disconnected prior to inserting or removing the ribbon interconnect cable.

Q: What power source is required for the 20 DC input channels?

A: An external 10-30 VDC power supply must be connected to the field input loop to source current through the 1745-E153 current sinking input circuits.

Field Installation Guidelines

• Physical Mounting & Thermal Clearance: Secure the expansion unit to the mounting backpanel using standard mounting hardware. Maintain a minimum vertical clearance of 50 mm (2 inches) above and below the housing to facilitate natural thermal convection.
• Ribbon Interconnect Cable Assembly: Fully seat and latch the multi-conductor expansion bus ribbon cable into both the master SLC 150 base and the 1745-E153 header connectors before restoring system power.
• Grounding & Wiring Separation: Run a heavy-gauge copper conductor from the chassis ground terminal directly to the enclosure single-point earth ground bar. Separate low-voltage DC input cables from high-voltage AC output wiring conduits by at least 200 mm to suppress inductive cross-talk.