The Allen‑Bradley 1753‑L28BBBM is a GuardPLC 1600 safety controller with integrated I/O. It provides 28 onboard I/O points (20 digital inputs and 8 digital outputs) in a compact, integrated design, making it suitable for small to medium‑sized safety applications such as emergency stop systems, safety gate interlocking, and machine guarding.
Item No :
1753-L28BBBMOrder(MOQ) :
1 PiecePayment :
EXWProduct Origin :
USAShipping Port :
WuhanLead Time :
3-5daysWeight :
5KGPart Number: 1753‑L28BBBM
Product Type: Safety Controller, GuardPLC 1600 Series
Digital Inputs: 20 non‑isolated, 24V DC (on‑state voltage 15–30V DC)
Digital Outputs: 8 non‑isolated, transistor outputs (output voltage range 18.4–26.8V DC, 0.5–1A)
Memory: 250 KB user program memory + 250 KB application data memory
Communication: Modbus RTU slave via RS‑485 (COMM1 port); 4‑port embedded Ethernet switch
Operating Voltage: 24V DC (‑15% to +20%), max current consumption 8A
Protection: IP20
Safety Time: ≥20 ms minimum
Watchdog Time: ≥10 ms minimum
Dimensions (WxHxD): 114 x 257 x 66 mm (4.49 x 10.1 x 2.60 in)
Weight: approx. 1.1‑1.2 kg (2.4‑2.6 lb)
| Category | Model | Key Features |
|---|---|---|
| Safety Output Module | 1753‑OB16 | 16‑point 24V DC safety digital outputs, SIL 3, 2A per point |
| Safety Input Module | 1753‑IB16 | 16‑point 24V DC safety digital inputs |
| Mixed I/O Module | 1753‑IB20XOB8 | 20 inputs / 8 outputs combo module for flexible configurations |
| Higher‑End Controller | 1753‑L32BBBM‑8A | GuardPLC 1800 series with analog inputs and high‑speed counters |
| Programming Software | RSLogix Guard PLUS! | Required for configuration, programming, and safety logic development |
Q1: What safety certifications does the 1753‑L28BBBM hold?
It is certified to SIL 3 per IEC 61508 and PLe / Category 4 per ISO 13849‑1 for use in safety‑critical applications .
Q2: Can I expand I/O beyond the onboard points?
Yes. The controller integrates with distributed GuardPLC I/O modules (such as 1753‑IB16 and 1753‑OB16) via the GuardPLC Ethernet network .
Q3: What communication protocols are supported?
The controller supports Modbus RTU slave via the RS‑485 COMM1 port, enabling data exchange with external systems. It also includes a 4‑port Ethernet switch for GuardPLC networking .
Q4: What is the function of the watchdog timer?
The watchdog timer (minimum 10 ms monitoring interval) supervises the execution cycle and forces a controlled reset if scan execution exceeds defined limits, ensuring deterministic safety operation .
Q5: What are the output current ratings?
Each output supports 0.5A to 1A, with a total group current limit of 8A. Performance should be derated at higher operating temperatures.
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