COMPACT LADDER CONTROLLER · AC INPUT

Allen-Bradley 1745-LP101 SLC 100 Programmable Controller

Name: Allen-Bradley 1745-LP101 SLC 100 Programmable Controller
Brand: ALLEN-BRADLEY
SKU: 2909806
Price: 1 USD
Availability: InStock

A 16-point base controller with AC inputs and relay outputs.

16 I/O BASE100

SLC 100

Controller Summary

Allen-Bradley 1745-LP101 is an SLC 100 processor unit. It combines the processor, user memory and local I/O used to execute an SLC 100 ladder program and control the connected input and output circuits.

The local I/O on 1745-LP101 consists of ten 85–132 V AC inputs and six hard-contact outputs rated for 10–250 V AC or 10–125 V DC circuits. Incoming power accepts either 85–132 V AC or 170–265 V AC at 50/60 Hz, and the 16-point base can be expanded to a 112-I/O system.

Program storage in 1745-LP101 is 885 words of CMOS RAM with lithium-battery backup, and an optional 1745-M1 EEPROM can store the program outside RAM. Typical scan time is 15 ms, with the actual value dependent on program length.

SLC 100 processor unit with labeled terminals indicators ports and compartments — SLC 100 processor-unit hardware callouts.

VERIFIED OPERATING VALUES

Hardware Data

Technical Item	1745-LP101
Brand	Allen-Bradley
Product Type	SLC 100 programmable controller
Brand Country	United States
Supply Voltage	85–132 / 170–265 V AC, 50/60 Hz
Onboard I/O	16 points
Input Count	10
Input Type	85–132 V AC
Output Count	6
Output Type	Hard contact, 10–250 V AC / 10–125 V DC
Maximum System I/O	112 points with expansion
Program Memory	885 words, CMOS RAM
Typical Scan Time	15 ms, program dependent
Memory Backup	Lithium battery, 2–3 year life
Power Fuse	315 mA / 250 V
Input Filter Time	10–25 ms
Optical Isolation	1500 V
Operating Temperature	0–60 °C

LOCAL DIAGNOSTICS

Processor Status Diagnostics

Processor state

1745-LP101 uses DC POWER and PC RUN indicators to show energized and Run-mode states.

Fault and retention

CPU FAULT identifies a detected CPU or memory error, while BATTERY LOW indicates that backup-battery voltage has crossed its threshold.

Forced and field I/O

FORCED I/O identifies forced addresses; ten input LEDs and six output LEDs correspond to the local terminal addresses.

OPERATING MODE

Power-Up and Run-Mode Control

The Auto/Manual switch determines whether the processor resumes Run mode after startup checks.1745-LP101

On 1745-LP101, the Auto position allows the processor to complete diagnostics and return to Run mode when it was running before power-down.

In Manual, startup diagnostics still run but the processor does not enter Run mode automatically.
Run mode can then be entered by moving the switch to Auto or by using the pocket programmer or a personal computer.
The same switch behavior applies after a brownout or correction of a CPU fault.

FIELD QUESTIONS

Maintenance Questions

How many onboard I/O points does 1745-LP101 provide?+

It provides 16 points: ten AC inputs and six hard-contact outputs. Expansion can increase a complete system to 112 I/O points.

What supply range can 1745-LP101 accept?+

The controller accepts either 85–132 V AC or 170–265 V AC at 50/60 Hz. Verify the terminal selection and site supply before energizing.

Why can a field signal appear delayed on 1745-LP101?+

The published AC input filter is 10–25 ms. Mechanical contact bounce and ladder scan behavior can add to the perceived response.

Can 1745-LP101 relay outputs switch any load below 250 V?+

No. Voltage is only one limit; current, inrush and load type also matter. Use the manual ratings and suppression for inductive devices.

What should be backed up before replacing 1745-LP101?+

Preserve the program, I/O documentation, timer/counter settings and an annotated wiring record before disturbing the installed controller.

How should 1745-LP101 be grounded and enclosed?+

Install it in a suitable industrial enclosure, bond the grounding path as instructed and separate noisy power conductors from sensitive control wiring.

MOORE AUTOMATION

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MULTI-BRAND INDUSTRIAL INVENTORY

Product Name	Allen-Bradley 1745-LP101 SLC 100 Programmable Controller
Item NO.	2909806
Weight	0.1 kg = 0.2205 lb = 3.5274 oz
Category	AB
Brand	ALLEN-BRADLEY
Creation Time	2026-09-20

Allen-Bradley 1745-LP101 SLC 100 Programmable Controller Item NO.: 2909806