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        • Lifecycle status

          Discontinued / Obsolete by OEM
          Apter Power supports output mapping, official manuals, condition review, and legacy SLC 150 sourcing.

        1745-LP151

        / 4.9
        1001 reviews ｜ Need a Specific Revision?
        Allen-Bradley 1745-LP151 is a red-patch SLC 150 processor with twenty 85–132 V AC inputs, twelve outputs, 1200 words of memory, and 4 ms typical scan time.
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        Ships by Wednesday, October 28
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        Warranty Policy
        We provide 1 year warranty for all remaining parts.
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        Return Notice
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        In the event of a defect, we will send new equipment, repair equipment or refund the purchase price based on our availability. You must contact us to obtain a return authorization and return the defective device to us within 14 days of reporting the defect.
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        Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.
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        Apter Power offers a wide range of components, products and services related to industrial automation. We also supply new products from a variety of quality manufacturers.
        How to order
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        Technical specifications for 1745-LP151

        • Manufacturer:
          Allen-Bradley
        • Part Number:
          1745-LP151
        • Product Family:
          SLC 100
        • Product Type:
          SLC 150 Processor Unit
        • Stock:
          1
        • Built-in I/O:
          20 inputs / 12 outputs
        • Input circuits:
          85–132 V AC, current sinking
        • Output circuits:
          10 triacs plus 2 hard contacts
        • User memory:
          1200 words
        • Typical scan time:
          4 ms per 1000 words
        • Internal relays:
          177 maximum
        • Memory backup:
          Capacitor; optional 1745-B1 battery
        • Color patch:
          Red
        • Estimated shipping dimensions:
          26.04x14.99x6.99cm
        • Tariff Code:
          8537101190
        • Country of origin:
          USA
        • Place of shipment:
          Xiamen,Fujian,China
        By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

        More Information

        Overview Manuals Output Types Program Backup Scan & Data Product Applications

        Features:

        • 32 integrated points: twenty inputs and twelve outputs in the processor unit
        • Mixed outputs: ten AC triacs are complemented by two hard contacts
        • Faster legacy scan: typical 4 ms execution for a 1000-word program
        The mixed output bank is the most important field-wiring distinction on this SLC 150 processor.

        Red patch and input-voltage evidence prevent confusion with the otherwise similar LP152.

        The larger memory and faster scan make a complete program and timing backup especially valuable during modernization.

        Apter Power can support 1745-LP151 mixed-output review, official manuals, condition verification, and legacy-control sourcing.
        Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
        • Triac points: map the ten AC loads to the correct terminals
        • Hard contacts: identify the two AC or DC switching duties separately
        • Suppression: retain the prescribed protection at inductive loads
        • Capacitor state: account for temperature and de-energized retention time
        • Battery option: verify whether 1745-B1 is fitted and record its service condition
        • Program copy: secure an external backup before extended power removal
        • Program size: archive the complete 1200-word application
        • Execution: document scan-sensitive inputs, outputs, and sequences
        • Internal data: preserve relay, timer, counter, and sequencer states needed for restart
        • Expanded relay replacement: coordinate 32 fixed discrete points
        • AC load control: use the documented triac outputs for matched circuits
        • Mixed-load machines: reserve the two hard contacts for supported AC or DC duties
        Description
        For larger fixed-I/O SLC applications, 1745-LP151 integrates twenty 85–132 V AC current-sinking inputs and twelve outputs with an SLC 150 processor. The red-patch configuration uses ten AC triac outputs plus two hard-contact outputs.

        A 1200-word CMOS RAM program and typical 4 ms scan per 1000 words give 1745-LP151 a faster and larger control base than the SLC 100 processors. The official architecture supports up to 177 internal relays and 32 timers, counters, or sequencers.

        Replacement preparation for 1745-LP151 should distinguish every triac and hard-contact load, preserve the program and I/O map, verify the input-voltage branch, and assess capacitor or optional 1745-B1 battery backup. LP152 shares the housing but uses a different input range and black patch.
        Alternative Names
        Allen-Bradley 1745-LP151 1745 LP151 SLC 150 red-patch processor SLC150 32-point 1200-word controller
        Technical notes
        Output-type mapping deserves special attention on 1745-LP151 because ten points are triacs and two are hard contacts. Record which loads use each terminal, confirm the red 85–132 V AC input identity, archive the 1200-word program, and document capacitor or battery backup condition before the processor is de-energized.
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        FAQS

        The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
        VIEW ALL FAQS
        Why must a replacement plan separate the triac and hard-contact outputs of 1745-LP151?
        The two output types do not have the same switching behavior. Map each circuit to its correct terminal and load duty before a replacement or modernization design is approved.
        What protects the program when 1745-LP151 will remain unpowered for an extended shutdown?
        An external program copy is the primary safeguard. Account for the documented capacitor-retention conditions and the presence and service state of any optional 1745-B1 battery before power is removed.
        Which fast machine events deserve special attention when migrating 1745-LP151 logic?
        Short pulses and tightly timed sequence transitions deserve direct observation. Compare their behavior during migration because the legacy scan can influence counters, interlocks, and event capture.
        Why can a lightly loaded circuit on 1745-LP151 appear energized when its triac should be off?
        Triac leakage and minimum load behavior can leave measurable voltage at the circuit. Compare the load with the official output specification rather than treating the point like a dry relay contact.
        How can an engineer avoid confusing 1745-LP151 with LP152 during panel work?
        Check the full catalog label, red patch, and field-input voltage. This processor uses the 85–132 V AC input branch, while LP152 uses the higher-voltage black-patch branch.
        What should a modernization test reproduce from 1745-LP151 before the legacy processor is removed?
        Reproduce the observed machine sequence, timing-sensitive events, interlocks, and output safe states. Keep the original system available until those behaviors have been demonstrated on the new platform.

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