Removable field terminals
1745-LP151 and 1745-LP152 use removable input and output terminal blocks with self-lifting pressure plates.
32 I/O BASE · VOLTAGE-SPECIFIC INPUTS
Allen-Bradley 1745-LP151 / 1745-LP152 SLC 150 Programmable Controllers
Two SLC 150 base units separated by AC input voltage class.
TWO INPUT CLASSES150
SLC 150
Variant Overview
Allen-Bradley 1745-LP151 and 1745-LP152 are SLC 150 processor units. Each combines the processor, program memory and 32 local I/O points used by an SLC 150 ladder program.
The input circuits distinguish 1745-LP151 from 1745-LP152: LP151 has twenty 85–132 V AC inputs with a red input cover, while LP152 has twenty 170–265 V AC inputs with a black input cover. Both units provide ten triac outputs and two hard-contact outputs.
Both 1745-LP151 and 1745-LP152 use 1200 words of CMOS RAM and have a typical scan time of 4 ms for a 1000-word program. Their capacitor backup retains memory for approximately two weeks at 30 °C, and the optional lithium battery has a 2–3 year life.
VERIFIED OPERATING VALUES
Verified Operating Data
| Technical Item | 1745-LP151 | 1745-LP152 |
|---|---|---|
| Brand | Allen-Bradley | Allen-Bradley |
| Product Type | SLC 150 programmable controller | SLC 150 programmable controller |
| Brand Country | United States | United States |
| Supply Voltage | 85–132 / 170–265 V AC | 85–132 / 170–265 V AC |
| Onboard I/O | 32 points | 32 points |
| Inputs | 20 | 20 |
| Input Voltage | 85–132 V AC | 170–265 V AC |
| Input Cover | Red | Black |
| Outputs | 10 triac + 2 hard contact | 10 triac + 2 hard contact |
| Program Memory | 1200 words, CMOS RAM | 1200 words, CMOS RAM |
| Typical Scan | 4 ms per 1000 words | 4 ms per 1000 words |
| Internal Relays | Up to 177 | Up to 177 |
| Timer / Counter / Sequencer Instructions | Up to 32 | Up to 32 |
| Capacitor Retention | About 2 weeks at 30 °C | About 2 weeks at 30 °C |
| Optional Battery | 1745-B1, approximately 2–3 years | 1745-B1, approximately 2–3 years |
| Operating Temperature | 0–60 °C | 0–60 °C |
INSTALLATION FEATURES
Removable Terminal and Expansion Connections
Circuit identification
The hinged terminal covers include write-on areas for identifying external circuits.
Expansion connection
A 20-pin to 10-pin ribbon cable connects an expansion unit or a high-speed input module to the processor.
PROGRAMMING FUNCTIONS
SLC 150 Internal Status Instructions
Three SLC 150-only addresses expose memory, battery and triac-control functions to the ladder program.1745-LP151 / 1745-LP152
1745-LP151 and 1745-LP152 use address 864 for programmable EEPROM auto-load after a detected memory checksum error.
- Address 865 is ON while the optional battery voltage is normal and turns OFF below the battery threshold.
- Address 866 is the triac zero-cross turn-on instruction.
- The zero-cross instruction synchronizes the triac outputs with the AC line.
FIELD QUESTIONS
Selection FAQs
What is the decisive difference between 1745-LP151 / 1745-LP152?+
The input voltage. LP151 uses 85–132 V AC inputs, while LP152 uses 170–265 V AC inputs. The cover colors provide a visual cross-check.
Do 1745-LP151 / 1745-LP152 have the same output arrangement?+
Yes. Each has ten triac outputs and two hard-contact outputs, but the connected loads must still meet the detailed ratings.
How much program memory is available in 1745-LP151 / 1745-LP152?+
Both provide 1200 words of CMOS RAM with a typical scan of 4 ms per 1000 words.
How long can 1745-LP151 / 1745-LP152 retain memory without the optional battery?+
The manual gives approximately two weeks at 30 °C for the internal capacitor, falling to about one week at 60 °C.
Why is the cover color important on 1745-LP151 / 1745-LP152?+
Red identifies the LP151 low input-voltage class and black identifies the LP152 higher input-voltage class. Wiring checks must still confirm the actual catalog number.
What should be recorded before exchanging 1745-LP151 / 1745-LP152?+
Save the program, I/O map, field-voltage identification, output-load list and memory-retention status before the controller is powered down.
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