Allen-Bradley 1768-L43S
Allen-Bradley 1768-L43S
Allen-Bradley 1768-L43S
Allen-Bradley 1768-L43S
Allen-Bradley 1768-L43S
Allen-Bradley 1768-L43S
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1768-L43S

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Allen-Bradley 1768-L43S integrates standard and safety control into a single Compact GuardLogix platform, combining 2 MB standard memory with 0.5 MB safety memory.
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Technical specifications for 1768-L43S

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1768-L43S
  • Product Family:
    CompactLogix
  • Product Type:
    Compact GuardLogix Controller
  • Embedded Network Port:
    None
  • Local Programming Port:
    1 RS232
  • Memory:
    2 MB
  • Non Volatile Memory Option:
    CompactFlash
  • Safety Memory:
    0.5 MB
  • Number of 1768 modules, max:
    2
  • Number of 1768 motion modules, max:
    2
  • Number of I/O banks, max:
    2
  • Number of 1769 I/O modules, max:
    16
  • Power dissipation:
    7.5 W
  • Slot width:
    1.5
  • Power consumption:
    33.6 W
  • 1768 current draw:
    2.8A @ 5V DC
  • Total 1768 and 1769 current draw:
    4.8A @ 5V DC
  • Backplane current draw:
    1.4A @ 24V DC
  • Available user memory:
    2 MB standard, 0.5 MB safety
  • Communication bus:
    RS-232
  • Number of 1768 communication modules, max:
    2
  • Power supply distance rating:
    4 modules
  • 1769 current draw:
    2.0A @ 5V DC
  • Power supply:
    1768-PA3, 1768-PB3
  • Wire category:
    2 - on communication ports
  • Module expansion capacity:
    Two 1768 modules, Sixteen 1769 modules
  • Module location:
    DIN rail or panel mount
  • Communication ports:
    RS-232, Fully isolated, 38.4 Kbps max
  • Panel-mounting screw torque:
    1.16 Nm (10 in-lb) - use M4 or #8 screws
  • Shock:
    Operating: 30 G
  • Surrounding air temperature, max:
    60 °C
  • Operating temperature:
    0 °C
  • Storage temperature:
    -40 °C
  • Vibration:
    5 G @ 10...500 Hz
  • Relative humidity:
    5...95% noncondensing
  • Emissions:
    CISPR 11 (IEC 61000-6-4)
  • EFT/B immunity:
    ±4kV @ 5kHz on communication ports
  • ESD immunity:
    6 kV contact discharges, 8 kV air discharges
  • Surge transient immunity:
    ±2 kV line-earth (CM) on communication ports
  • Conducted RF immunity:
    10V rms with 1 kHz sine-wave 80% AM from 150 kHz...80 MHz
  • Weight:
    0.34 kg
  • Estimated shipping dimensions:
    6.6x12.2x13cm
  • Tariff Code:
    8480719090
  • 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 Specifications Upgrades Use Cases Diagnostics

Features:

  • Integrated safety and standard control within a single Compact GuardLogix architecture improves system efficiency.
  • Flexible expansion supports both 1768 and 1769 modules for scalable automation design.
  • Robust environmental and electrical immunity ensures reliable operation in demanding industrial conditions.
Allen-Bradley 1768-L43S provides a balanced solution for modern industrial automation systems that require both safety and standard control. By combining two backplane architectures, the controller enables seamless integration of safety functions without the need for separate hardware. This unified approach reduces engineering effort and simplifies system validation. Industrial users benefit from a streamlined configuration environment where safety and logic coexist. The controller supports a wide range of applications, from manufacturing lines to process systems. Such versatility makes Allen-Bradley 1768-L43S a practical choice for integrated control strategies.

In terms of functionality, Allen-Bradley 1768-L43S offers strong processing capability supported by dedicated memory resources for both control types. Standard programming flexibility allows multiple languages, while safety execution remains restricted to certified instructions for compliance. Communication through RS-232 ensures reliable data exchange, especially in legacy or simple network setups. Expansion capabilities further enhance adaptability, allowing additional modules to extend system performance. This combination ensures that Allen-Bradley 1768-L43S meets both operational and regulatory requirements.

From an application perspective, Allen-Bradley 1768-L43S fits well in industries where safety integrity is critical, such as packaging, material handling, and automated production systems. The ability to support motion control modules extends its usability in dynamic environments. Installation flexibility through DIN rail or panel mounting accommodates different cabinet designs. Environmental resilience ensures stable operation even under vibration or electrical interference. With these capabilities, Allen-Bradley 1768-L43S supports long-term reliability and efficient automation system design.

The 1768-L43S Allen-Bradley Compact GuardLogix Controller may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Allen-Bradley 1768-L43S Compact GuardLogix Controller Manuals,Datasheets,Link 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.
Allen-Bradley 1768-L43S Compact GuardLogix Controller Specs

General

  • Manufacturer Allen-Bradley
  • Model 1768-L43S
  • Condition New Original ready stock
  • Product Family 1768-L43,1768-L45,1768-L45S
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.
  • Firmware Version Migration: The controller firmware can be flashed online or offline using the ControlFLASH utility provided by Rockwell Automation to adapt to different hardware network systems.
  • Programming Environment Compatibility: The controller firmware must be updated to the same revision as the currently used RSLogix 5000 software version (up to V20) to ensure successful connection establishment.
  • Non-Volatile Memory Synchronization: After a firmware update, the latest user programs, flag data, and network configuration parameters can be imported via the controller's CompactFlash flash memory card slot.
  • Non-Volatile Memory Synchronization: Time Synchronization Master Station Upgrade: Supports configuration as a Coordinated Common Time (CST) master station, enabling the upgraded system to provide a unified timestamp for the entire baseboard and production network.
  • Integrated Safety Control: Suitable for complex industrial equipment requiring SIL 3 or PLe safety levels, handling both standard and safety logic control within a single project.
  • Multi-Axis Motion Control: Combined with Sercos interface modules, enabling synchronous motion control of up to 16 axes in high-precision automated assembly lines such as packaging and material handling.
  • Distributed Network Communication: For device-level automation systems that interconnect multiple field sensors and distributed 1769 I/O modules via EtherNet/IP or ControlNet bridging modules.
  • Standalone Automation Equipment: Suitable for small to medium-sized, independently operating manufacturing units, utilizing its built-in RS-232 serial port for local data acquisition and HMI terminal connection.
  • Hardware Status Indication: Status LEDs on the front of the controller provide real-time monitoring of system operation, safety locks, and battery status, enabling efficient visual location of low-level faults.
  • Main Fault Routing Handling: A main fault handler can be configured in RSLogix 5000 programming to automatically capture and respond to non-fatal anomalies in backplane communication and operation.
  • Secure Network Monitoring: Real-time monitoring of the Security Network Number (SNN) status and security task signatures prevents downtime caused by unauthorized configuration changes or communication interruptions.
  • I/O Module Status and Connectivity: The programming software can perform connectivity diagnostics on each local I/O module on the backplane, reading module-level channel disconnection or power supply fault information.
Description
Allen-Bradley 1768-L43S belongs to the Compact GuardLogix L4x family, combining a 1768 backplane with a 1769 I/O platform to unify safety and standard control within one controller. This architecture allows users to manage both safety and non-safety tasks in a single project environment, simplifying configuration and reducing system complexity. The controller supports up to two 1768 modules and sixteen 1769 I/O modules, providing scalable expansion for various automation requirements.

Memory resources in Allen-Bradley 1768-L43S include 2 MB of standard user memory and 0.5 MB dedicated safety memory. Standard tasks support all programming languages, while safety tasks are executed using relay ladder logic and certified safety instructions. This separation ensures compliance with SIL 3 and PLe requirements while maintaining flexibility in general control programming.

Communication in Allen-Bradley 1768-L43S is handled through a fully isolated RS-232 port with a maximum transmission rate of 38.4 Kbps. The controller supports up to two additional 1768 communication modules, allowing system designers to extend connectivity when required. Isolation voltage for communication circuits reaches 30V continuous, with type testing at 500V AC for 60 seconds, enhancing reliability in industrial environments.

From a hardware perspective, Allen-Bradley 1768-L43S operates with a power consumption of 33.6 W and a power dissipation of 7.5 W. The module draws 2.8A at 5V DC on the 1768 backplane and contributes to a total system current draw of 4.8A when combined with 1769 modules. The controller supports DIN rail or panel mounting, ensuring flexible installation options across control cabinets.

Environmental performance allows Allen-Bradley 1768-L43S to function within 0 to 60°C operating temperatures, withstanding vibration up to 5 G and shock up to 30 G. Immunity features include ESD protection up to 8 kV air discharge and EFT immunity up to ±4 kV, ensuring stable operation in demanding industrial conditions. Compatibility with CompactFlash for non-volatile memory further enhances data retention and system reliability.
Revisions

Revision Part #

Also known as

1768-L43S Ser A
1768-L43S/A, Series A, Rev A
1768-L43S Ser B
1768-L43S/B, Series B, Rev B
Alternative Names
I768-L43S I768L43S 1768L43S 1768-L43 1768-L45 1768-L45S I76BLA3S I76B-LA3S
Technical notes
The Allen-Bradley 1768-L43S is a discontinued Compact GuardLogix controller delivering integrated SIL 3/PLe safety and motion capabilities via a dual-bus architecture, featuring 2 MB of standard memory, 0.5 MB of dedicated safety memory, and compatibility with RSLogix 5000 software up to version 20.
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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.
What type of control capability does Allen-Bradley 1768-L43S provide in automation systems?
Allen-Bradley 1768-L43S combines standard and safety control, enabling SIL 3/PLe safety applications alongside conventional automation tasks within one controller.
How expansion capacity is handled by Allen-Bradley 1768-L43S in larger systems?
Allen-Bradley 1768-L43S supports up to two 1768 modules and sixteen 1769 I/O modules, allowing flexible system scaling.
Why Allen-Bradley 1768-L43S uses separate safety memory?
Allen-Bradley 1768-L43S includes 0.5 MB dedicated safety memory to ensure certified execution of safety logic independent from standard control tasks.
How communication is achieved using Allen-Bradley 1768-L43S?
Allen-Bradley 1768-L43S uses a fully isolated RS-232 port with up to 38.4 Kbps transmission and supports additional communication modules.