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        • Lifecycle status

          Discontinued / Obsolete by OEM
          Apter Power supports voltage-variant checks, official manuals, condition review, and legacy processor sourcing.

        1745-LP101

        / 4.9
        1001 reviews ｜ Need a Specific Revision?
        Allen-Bradley 1745-LP101 is a 16-point SLC 100 processor with ten 85–132 V AC inputs, six hard-contact outputs, and 885 words of user memory.
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        Ships by Thursday, October 29
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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.
        Parts Availability
        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
        We have been working hard to update our inventory. If we have stock or parts available for new factory purchases, you can contact the order online. If we do not currently have an inventory, the displayed quantity will show "Ask". Please create an online quote or contact us by phone, fax or email to check availability.

        Technical specifications for 1745-LP101

        • Manufacturer:
          Allen-Bradley
        • Part Number:
          1745-LP101
        • Product Family:
          SLC 100
        • Product Type:
          SLC 100 Processor Unit
        • Stock:
          1
        • Built-in I/O:
          10 inputs / 6 outputs
        • Input circuits:
          85–132 V AC, current sinking
        • Output circuits:
          6 hard contacts, 10–250 V AC / 10–125 V DC
        • User memory:
          885 words
        • Typical scan time:
          15 ms
        • Timers/counters/sequencers:
          32 maximum
        • Color patch:
          Red
        • Operating temperature:
          0–60 °C
        • Estimated shipping dimensions:
          25x9.5x12.4cm
        • 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 Input Match Program Backup Relay Loads Product Applications

        Features:

        • Low-voltage inputs: ten 85–132 V AC current-sinking points
        • Integrated control: processor, power supply, and 16 I/O share one enclosure
        • Legacy memory: 885 words support the documented SLC 100 instruction set
        The red patch is a practical identity check because it separates the LP101 input circuit from the black LP102 variant.

        Six hard-contact outputs can switch the official AC or DC ranges, but inductive loads still require the prescribed suppression at the load.

        Program and expansion evidence should be recovered while the original controller can still be observed.

        Apter Power can assist with 1745-LP101 voltage-variant review, official manuals, condition checks, and legacy-processor 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.
        • Red patch: use the physical marking to confirm the 85–132 V AC variant
        • Field voltage: measure the actual circuit before reconnection
        • Leakage: compare two-wire sensor off-state current with the official input limits
        • Logic record: save the complete ladder program and instruction use
        • Scan dependency: document timers, counters, sequencers, and machine timing
        • Backup path: confirm the available programmer, cable, and memory-copy procedure
        • Load class: identify each AC or DC device on the six hard contacts
        • Suppression: retain the prescribed network or diode at inductive loads
        • Contact health: inspect switching history and avoid reconnecting an unknown short circuit
        • Relay-panel replacement: consolidate small discrete control sequences
        • Legacy machine logic: run supported timers, counters, relays, and sequencers
        • Low-voltage AC sensing: monitor matched 85–132 V AC field circuits
        Description
        For small relay-replacement systems, 1745-LP101 combines an SLC 100 processor, power supply, ten 85–132 V AC current-sinking inputs, and six hard-contact outputs in one 16-point unit. The red color patch identifies this low-voltage AC input variant.

        Program execution in 1745-LP101 uses 885 words of CMOS RAM with a typical 15 ms scan. The official instruction set supports as many as 32 timers, counters, and sequencers in any combination, giving legacy machines a compact ladder-logic control core.

        Maintenance planning for 1745-LP101 should preserve the processor program, I/O address map, power and neutral arrangement, output-load suppression, expansion sequence, and field-terminal record. A higher-voltage LP102 cannot be selected only because the housing and I/O count look similar.
        Alternative Names
        Allen-Bradley 1745-LP101 1745 LP101 SLC 100 low-voltage AC processor SLC100 16-point processor
        Technical notes
        Input voltage and program evidence must be secured before 1745-LP101 is exchanged. Confirm the red 85–132 V AC input variant, incoming-power connection, I/O addresses, hard-contact load suppression, program backup, scan-dependent sequence, and connected expansion chain. De-energize the complete SLC 100 assembly before disturbing interconnects or field wiring.
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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
        How can maintenance distinguish 1745-LP101 from the similar LP102 before ordering?
        Use the full catalog label and red patch, then confirm the field-input voltage. This processor uses the 85–132 V AC input branch rather than the higher-voltage LP102 branch.
        If a two-wire sensor keeps an input of 1745-LP101 on, what is the first diagnostic boundary?
        Compare the sensor's off-state leakage with the official input limit. Use only the documented field-circuit remedy if leakage prevents the point from reaching its off state.
        Why should incoming power be checked before replacing 1745-LP101 after intermittent resets?
        Widespread I/O changes and lost execution can originate upstream of the processor. Verify the supply, neutral, and fuse condition first; unstable power is a stop condition for further controller testing.
        Which machine behavior should be observed before migrating a program from 1745-LP101?
        Capture the real timing of timers, counters, sequencers, and I/O transitions. A ladder printout alone does not show every behavior that may depend on the legacy scan and expansion arrangement.
        What should be reviewed if a contactor connected to 1745-LP101 repeatedly damages an output?
        Start with load inrush and the suppression device at the coil. Reconnect only after the circuit is within the documented hard-contact duty and no field short remains.
        When can adding or moving expansion I/O around 1745-LP101 change program behavior?
        A change in physical order can change the assigned I/O blocks. Preserve the original chain and reconcile every affected program address before restart.

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