Excellent PLC
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Introduction
The Allen Bradley 1756-L84ES is part of the GuardLogix 5580 family, offering an integrated platform for both standard and safety control tasks. With advanced memory and communication capabilities, this controller is designed for applications that require a combination of standard control and functional safety logic. It supports 20 MB of user memory and 6 MB of safety memory, as well as a high-speed 1 Gb Ethernet port. This makes the 1756-L84ES ideal for managing large automation systems that require both safety and control in one solution.
Product Parameters
| Parameter | Value | Notes / Comments |
|---|---|---|
| Standard (user) memory | 20 MB | For standard control logic. |
| Safety memory | 6 MB | For safety logic tasks. |
| Maximum digital I/O points | 128,000 | Upper bound for digital I/O. |
| Maximum analog I/O points | 4,000 | Upper bound for analog I/O. |
| Embedded Ethernet port | 1 Gb/s | For EtherNet/IP communication. |
| USB port | USB 2.0 (12 Mbps) | Programming/configuration only. |
| EtherNet/IP device limit | 250 nodes | Maximum devices connected via EtherNet/IP. |
| Current draw @1.2 V DC | ~5 mA | Typical draw at low voltage. |
| Current draw @5.1 V DC | ~1.20 A | Typical draw at standard logic voltage. |
| Power dissipation | ~6.2 W | Approximate at full load. |
| Operating temperature | 0°C to +60°C | Standard industrial ambient. |
| Storage temperature | –40°C to +85°C | For non-operating storage. |
| Relative humidity | Up to 95% non-condensing | Environmental rating. |
| Dimensions (H × W × D) | 145 mm × 140 mm × 35 mm | Approx. 5.7″ × 5.5″ × 1.4″. |
| Mounting | Compatible with 1756/ControlLogix chassis | Install in standard rack slot. |
Application Scenarios
The 1756-L84ES controller is ideal for scenarios such as:
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Safety-integrated machine control: Machines requiring both standard automation logic and certified safety logic (e.g., safety I/O, emergency stop processing, guard monitoring) can use one controller instead of separate units.
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Large I/O systems: With high I/O capacity (up to 128,000 digital, 4,000 analog) and support for many EtherNet/IP nodes, it suits large production lines, processing plants or distributed architectures.
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Networked automation & motion: With built-in 1 Gb Ethernet and support for EtherNet/IP, the controller supports high-speed motion and coordinated devices on the same network.
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Future-proof systems: The generous memory and device support provide headroom for system expansion, additional I/O modules, networked devices or more complex logic.
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Industrial environments with high requirements: Designed for robust operation in industrial control panels with standard ambient and electrical characteristics, suited for demanding plants or OEM machines.
Advantages (Key Strengths)
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Combined Standard + Safety Logic: Enables one controller to handle both standard control and safety tasks (via GuardLogix safety memory segment), simplifying architecture and reducing system complexity.
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High Memory & Capacity: 20 MB user memory and 6 MB safety memory provide strong capacity for large logic sets, data handling, and complex safety logic.
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High-Speed Ethernet: The embedded 1 Gb Ethernet port allows fast communication, large data throughput, and supports high device count (up to 250 EtherNet/IP nodes).
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Large I/O and Device Support: With capability to manage up to 128,000 digital and 4,000 analog points, and a large number of networked devices, it suits large-scale automation.
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Integrated Motion Support: Supports integrated motion over EtherNet/IP, allowing motion axes to be managed from the same controller platform.
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Flexible Programming: Supports typical automation languages (Ladder, ST, FBD, SFC) for standard tasks; safety tasks support Ladder only.
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Robust Industrial Design: Rated for standard industrial ambient, supports RIUP (removal/insertion under power) in suitable chassis, with conformal-coated variants available.
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Ecosystem Compatibility: Part of the Rockwell Automation ControlLogix / GuardLogix ecosystem, ensuring broad module compatibility, software support, and long-term availability.
