1761-L16BBB Allen-Bradley

1761-L16BBB Allen-Bradley I / O module

Product  Description：

The 1761-L16BBB belongs to the first generation of MicroLogix controllers. The "BBB" suffix indicates its specific electrical configuration: it uses DC power and features DC inputs and DC outputs. It is built for rugged industrial environments and utilizes a dedicated RS-232 communication port (8-pin mini-DIN) that supports the DF1 protocol for programming and interfacing with Human Machine Interfaces (HMIs).

Product Parameters

• Input Power: $24 \text{ VDC}$

• Total I/O Count: 16 points

• Discrete Inputs: 10 points ($24 \text{ VDC}$ Sink/Source)

• Discrete Outputs: 6 points ($24 \text{ VDC}$ Source/FET)

• Memory Type: EEPROM based, storing approximately 1,000 words (500 instructions)

• Communication Port: RS-232 (8-pin mini-DIN) supporting DF1 Full-Duplex, DF1 Half-Duplex Slave, and DH-485 via an external converter.

• Operating Temperature: $0\text{°C}$ to $55\text{°C}$ ($32\text{°F}$ to $131\text{°F}$)

• Mounting Options: DIN rail or panel mount

• Dimensions: Approximately $120 \text{ mm} \times 73 \text{ mm} \times 80 \text{ mm}$

Product Advantages

The MicroLogix 1000 series is celebrated for its Compact Design, which allows it to fit into tight control panels where larger modular PLCs cannot. Because it is an All-In-One Solution, there is no need to purchase separate power supplies or I/O cards, which reduces total system cost for simple applications. The High-Speed Counter feature included in the DC models allows the controller to interface with encoders or high-speed sensors at rates up to $6.6 \text{ kHz}$. Additionally, the use of EEPROM Memory ensures that the user program is retained without the need for a battery, reducing long-term maintenance requirements.

Important Considerations and Precautions

Users must be aware that the 1761-L16BBB is a Legacy Product. Rockwell Automation has moved this series to "End of Life" status, meaning it is largely superseded by the Micro800 series. Finding replacements may require sourcing through surplus or refurbished channels.

When wiring, ensure that the $24 \text{ VDC}$ polarity is correct; reversing the polarity can damage the internal power supply. The DC outputs are FET-type (Source), which means they provide voltage to the load; ensure your field devices are compatible with this "Sourcing" configuration. Finally, the RS-232 port is not isolated; if you are connecting it to a PC or HMI over a long distance with potential ground loops, an optical isolator (such as the 1761-NET-AIC) is strongly recommended to protect the communication circuitry.

Product Applications

The 1761-L16BBB is ideal for localized, small-scale control tasks that do not require extensive networking or a high number of I/O points.

• Material Handling: Small conveyor systems, sorting gates, and basic pick-and-place stations.

• Packaging Machinery: Bagging machines, labeling equipment, and heat sealers.

• Commercial Building Automation: Control of lighting systems, simple HVAC fans, and security gate entry/exit logic.

• Pumping and Irrigation: Automated well pumps, localized irrigation timers, and tank level control.

• OEM Equipment: Manufacturers of specialized tools often embed this PLC to handle internal machine logic due to its small footprint and low cost.

The structure and details of the product：

Our services：

Shipping Port:  China

Payment: Bank of Chicago, Bank of Singapore

Express cooperation: fedex, DHL, UPS and your express account

Service: Professional Sales provides 24 hours /7 days online service

Warranty: one year

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