Description
Product Name: 1745-LP152 Allen Bradley Input module
Product details:
The Allen-Bradley 1745-LP152 is generally identified as a Processor Unit or a Main Controller Module for the SLC 150 line. This module forms the core of the SLC 150 control system, managing the program execution, input/output (I/O) scanning, and communication.
Product Specifications (Parameters)
The available search data suggests the following key specifications, though some details may be specific to different module types within the series:
| Parameter | Value / Description | Note |
| Manufacturer | Allen-Bradley (Rockwell Automation) | |
| Product Line | SLC 150 | Older, discontinued small PLC platform |
| Part Number | 1745-LP152 | Main Processor Module |
| Input Terminals | 20 | Digital Inputs |
| Output Terminals | 12 | Outputs (Type typically relay or triac) |
| Input Type | Digital | |
| Input Power | 170 to 265 Volts AC | AC Power Requirement |
| Weight | Approx. 4.13 lbs (1.87 kg) | |
| Communication Cable | 1745-C2 (Typically for programming) | |
| Memory/Program | Stored within the processor. Often battery-backed. | The battery (e.g., 1745-LP152 Battery, 3.0V Lithium) is critical for retaining program and data. |
Product Advantages (Features/Benefits)
As a component of the SLC 150 system, the 1745-LP152 offered several advantages for its time:
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Integrated Design: It provided a compact, all-in-one controller solution for small-scale automation tasks, combining the CPU, power supply, and I/O into a single unit.
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Cost-Effective: It was a relatively inexpensive entry-point for industrial automation compared to larger PLC systems.
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Simplicity: The SLC 150 was known for its ease of programming (typically using the AB-150 Ladder Logic language) and deployment in smaller applications.
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Reliability: Built with industrial-grade components, offering reliable operation in typical factory environments.
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Digital I/O: Sufficient digital I/O points for basic machine control, sequencing, and interlocking.
Important Considerations (Notes)
Since the SLC 150 is an older and discontinued product line, there are several crucial considerations:
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Obsolescence: The SLC 150 series is obsolete. Finding new parts, technical support, and documentation can be extremely difficult.
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Replacement/Upgrade: If the unit is for a new project, it is highly recommended to use a modern platform like the MicroLogix or Micro800 series from Rockwell Automation.
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Battery Maintenance: The processor uses a battery (like the 1745-LP152 Battery) to maintain the memory contents (user program and data) when power is off. The battery must be replaced regularly (typically every few years), and replacement must be done while the PLC is powered up to prevent program loss.
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Programming Tools: Older, sometimes proprietary, programming software is required, which may not be compatible with modern operating systems.
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Limited Capabilities: Compared to modern PLCs, it has limited memory, slower scan times, and lacks built-in advanced networking capabilities (like Ethernet/IP).
Product Applications
The Allen-Bradley 1745-LP152, as part of the SLC 150 system, was historically used for:
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Simple Machine Control: Controlling small conveyors, drill presses, assembly stations, or packaging machines.
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Basic Process Sequencing: Implementing timed sequences or simple batch control.
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Standalone Control Loops: Used in applications where a limited number of digital inputs and outputs were needed for on/off control.
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Small HVAC or Building Automation Systems: Simple control logic for fans, pumps, and damper systems.
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