Allen-Bradley 1753-L28BBBM GuardPLC Safety Controller Module
$123.00
$320.00
Description
Allen-Bradley 1753-L28BBBM GuardPLC Safety Controller Module
The Allen-Bradley 1753-L28BBBM, also cataloged as the 1753-L28BBBM Safety Controller, operates as a dedicated hardware component for deterministic safety logic execution within GuardPLC 1600 control architectures. Configured for processing digital I/O states and executing safety program sequences in real-time, the module provides direct control over distributed GuardPLC I/O subsystems while maintaining RS-485 Modbus RTU slave communication via COMM1 interface for external system integration.
The controller executes program logic using 250 KB user program memory and 250 KB application data memory, supporting structured safety task execution with defined scan timing constraints and watchdog supervision.
Suffix Breakdown & Model Matrix
No formal suffix segmentation is defined for 1753-L28BBBM. The full part number represents a fixed GuardPLC 1600 safety controller configuration.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1753-L28BBBM |
| Brand | Allen-Bradley |
| Weight | 1.11 kg |
| Power Consumption | 8 A max (24 V DC system supply) |
| Product Type | Safety Controllers |
| Product Line | GuardPLC |
| User Program Memory | 250 KB |
| Application Data Memory | 250 KB |
| Digital Inputs | 20 |
| Digital Outputs | 8 |
| Operating Voltage | 24 V DC |
| Output Voltage Range | 18.4 to 26.8 V DC |
| Output Current | 0.5 to 1 A |
| Safety Time | ≥ 20 ms |
| Watchdog Time | ≥ 10 ms |
| Communication | Modbus RTU (RS-485 slave via COMM1) |
| Protection Class | IP20 |
GuardPLC Deterministic Safety Execution and Communication Handling
The 1753-L28BBBM executes safety control logic within a GuardPLC scan cycle governed by watchdog supervision (10 ms minimum monitoring interval). Input sampling (20 digital inputs) and output actuation (8 channels) are synchronized to internal task scheduling to ensure deterministic state transitions.
The RS-485 COMM1 interface supports Modbus RTU slave communication, enabling integration with supervisory controllers through both star and daisy-chain network topologies. Internal memory segmentation separates user program execution (250 KB) from application data storage (250 KB), ensuring deterministic separation between logic code and runtime data buffers.
Frequently Asked Questions (FAQ)
Q: Can the 1753-L28BBBM execute safety logic while communicating over Modbus RTU?
A: Yes. Modbus RTU communication runs concurrently via RS-485 COMM1 without interrupting the safety task execution cycle.
Q: What is the function of the watchdog timer in this controller?
A: The watchdog timer monitors execution cycle timing and forces a controlled reset state if scan execution exceeds defined limits (minimum 10 ms supervision window).
Q: Are the outputs configurable for different voltage levels?
A: Outputs operate within a fixed range of 18.4 to 26.8 V DC and are not dynamically voltage-configurable.
Features
Minimum Order Quantity (MOQ)
We welcome bulk orders and have a minimum order quantity of just one unit.
Certificates and Documentation
Upon request, we can provide all necessary documentation, including Certificates of Origin/Conformance and other required export documents.
Delivery Time
For items in stock, we aim to deliver within 1-3 days after payment confirmation. Items with specified lead times will be delivered according to the quoted schedule.
Payment Methods
We accept 100% T/T (Telegraphic Transfer) payment before shipping. For items with lead times, a 30% deposit is required upfront, with the remaining 70% due before shipment. For RMB transfers, please contact us if you have an agent in China.
Warranty
We offer a standard one-year warranty on all new and original items. If you require an extended warranty, please contact us for additional cost details.
Refund and Return Policy
Your satisfaction is important to us. If you need to return an item, it must be done within 30 days of the order date. The product must be unused, unopened, and in its original packaging with all accessories included. Refunds are processed within 5-7 business days after we receive the returned item. Please note that shipping and related charges are non-refundable.
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