Allen-Bradley 1747-L552 PLC CPU

Product Details

1747-L552 Product Description

The Allen-Bradley 1747-L552 is the SLC 5/05 CPU module within the Rockwell Automation SLC 500 programmable controller family, purpose-built to serve as the central intelligence and Ethernet communication node in industrial network architectures. With a native 10/100 Ethernet port supporting TCP/IP, combined with onboard DF1 full-duplex and DH-485 multi-drop serial protocols, the 1747-L552 bridges legacy field devices and modern SCADA/HMI platforms across a single, unified data backbone. For system integrators and plant engineers managing smart factory transitions, this CPU delivers the protocol versatility, deterministic scan performance, and network stability required to sustain continuous production data flow from sensor to supervisory system.

At NANKMOS, every 1747-L552 unit is sourced from verified supply channels, subjected to pre-shipment functional testing, and backed by a 12-month warranty — ensuring your automation project timeline is protected from day one.

In a smart factory deployment, the 1747-L552 operates as the network-connected control core of the SLC 500 chassis, orchestrating data exchange across every layer of the automation hierarchy. At the field level, discrete sensors, proximity switches, and analog transmitters feed real-time process values into the SLC 500 I/O chassis via 1746-series I/O modules — including digital input cards such as the 1746-IB16 and analog input modules like the 1746-NI4 — which the 1747-L552 CPU scans deterministically to maintain accurate process state awareness.

On the drive and motion side, variable frequency drives communicating over DF1 or DH-485 — such as Allen-Bradley PowerFlex 40 and PowerFlex 400 series drives — receive speed references and status commands directly from the 1747-L552 via its Channel 0 RS-232 port, enabling closed-loop speed regulation without requiring a separate communication adapter. For installations where DeviceNet or PROFIBUS field devices are present, a 1747-SDN DeviceNet Scanner module installed in the SLC 500 chassis extends the 1747-L552's reach to distributed I/O nodes and smart field instruments across the plant floor.

Upstream, the 1747-L552's Ethernet port connects to the plant LAN through an industrial-grade managed switch — such as a Stratix 2000 or Stratix 5700 series switch — ensuring deterministic packet delivery and VLAN segmentation between the control network and the enterprise IT layer. SCADA platforms including Rockwell FactoryTalk View SE, Wonderware System Platform, and Inductive Automation Ignition connect to the 1747-L552 via EtherNet/IP or OPC-DA drivers, pulling live tag data for real-time dashboards, trend logging, and alarm management. HMI panels such as the PanelView Plus 6 or PanelView 800 communicate directly with the CPU over Ethernet, presenting operators with process graphics, setpoint controls, and fault acknowledgment screens at the machine level.

For remote monitoring and diagnostics, the 1747-L552's Ethernet connectivity enables RSLogix 500 programming software to connect from any networked engineering workstation, allowing engineers to perform online program edits, force I/O states, monitor data table values, and capture fault history without physical access to the control panel. In multi-site or geographically distributed installations, edge gateway devices — such as Moxa MGate or Red Lion Data Station Plus — can bridge the 1747-L552's DF1 or DH-485 data to cloud-based IoT platforms, enabling remote KPI dashboards, predictive maintenance alerts, and OEE analytics at the enterprise level. This end-to-end data chain — from field sensor through PLC CPU, industrial switch, SCADA server, and edge gateway to cloud visualization — represents the complete smart factory connectivity value delivered by the 1747-L552 in modern industrial network architectures.

Many industrial sites operating SLC 500 systems face a common set of connectivity challenges: protocol fragmentation between legacy serial devices and modern Ethernet infrastructure, data silos that prevent SCADA systems from accessing real-time field values, and limited remote visibility into machine states during off-hours or multi-shift operations. The 1747-L552 directly addresses these gaps through its multi-protocol architecture.

Where legacy DH-485 networks connect older Allen-Bradley SLC 5/03 or SLC 5/04 controllers, the 1747-L552 can serve as a protocol bridge — accepting DF1 serial data on Channel 0 while simultaneously publishing process values to Ethernet-connected SCADA and MES systems. This eliminates the need for standalone protocol converters and reduces network latency between field data acquisition and supervisory visualization. For plants managing alarm tracking and production reporting, the 1747-L552's Ethernet connectivity enables SCADA historians to log fault codes, cycle counts, and process deviations with millisecond-level timestamps, providing the audit trail required for ISO compliance and root-cause analysis.

System expansion is equally straightforward: additional 1746-series I/O modules can be added to the SLC 500 chassis without disrupting existing network configuration, and remote I/O drops connected via 1747-ASB Remote I/O Adapter modules extend the 1747-L552's control reach to distributed machine stations across large plant floors. For sites planning migration toward ControlLogix or CompactLogix platforms, the 1747-L552 supports phased integration — operating alongside newer Logix controllers on the same Ethernet network while legacy SLC 500 programs continue to run unmodified.

Q1: Does the Allen-Bradley 1747-L552 support EtherNet/IP communication with FactoryTalk View SCADA?Yes. The 1747-L552 SLC 5/05 CPU communicates natively over Ethernet TCP/IP and is fully compatible with Rockwell FactoryTalk View SE and ME via EtherNet/IP drivers. RSLinx Classic or RSLinx Enterprise can be configured to expose 1747-L552 data tags to FactoryTalk View, Wonderware, and OPC-compliant SCADA platforms without additional hardware.

Q2: Can the 1747-L552 communicate with third-party HMI and SCADA systems over Modbus TCP?The 1747-L552 does not natively support Modbus TCP; however, Modbus TCP integration is achievable through an edge gateway or protocol converter — such as a Moxa MGate MB3170 or ProSoft MVI56-MCM — that bridges EtherNet/IP or DF1 data to Modbus TCP for third-party SCADA, BMS, or energy management systems.

Q3: What is the maximum network response time for remote diagnostics via RSLogix 500 over Ethernet?Under normal plant LAN conditions with a managed industrial switch providing QoS prioritization, RSLogix 500 online monitoring of the 1747-L552 typically achieves sub-100ms response times for data table reads and program status updates. Network latency is primarily determined by switch configuration, VLAN segmentation, and concurrent Ethernet traffic load on the control network segment.

Q4: Does NANKMOS provide a warranty and pre-shipment testing for the 1747-L552?Yes. Every Allen-Bradley 1747-L552 unit supplied by NANKMOS undergoes pre-shipment functional verification and is covered by a 12-month warranty from the date of delivery. In-stock units are available for immediate dispatch to support urgent project timelines. Contact NANKMOS at [email protected] or +86 18359268345 for availability and lead time confirmation.