Honeywell 2MLR-AC22 Analog Output Module

Product Details

2MLR-AC22 Product Description

The Honeywell 2MLR-AC22 is a precision analog output module engineered for seamless integration within the Experion PKS distributed control system architecture. Designed to bridge field-level actuators and the upper-layer control network, this module delivers reliable 4–20 mA analog signal output while maintaining full compatibility with Honeywell's Fault Tolerant Ethernet (FTE) backbone — the high-availability, dual-redundant network protocol at the heart of modern Experion PKS deployments. In smart factory environments where continuous uptime and real-time data fidelity are non-negotiable, the 2MLR-AC22 serves as a critical node in the plant-wide data chain, connecting field devices to SCADA platforms, HMI workstations, and enterprise-level MES systems without signal degradation or communication latency.

Within a typical Experion PKS topology, the 2MLR-AC22 resides in a Series C I/O chassis alongside complementary modules such as the Honeywell 2MLR-AI22 analog input module and the 2MLR-DI22 digital input module, forming a tightly integrated I/O subsystem managed by the C300 Process Controller. The C300 controller coordinates all data exchange across the FTE network, ensuring that analog output commands issued from the Experion Station HMI or from a higher-level SCADA server are transmitted with deterministic timing and full redundancy. This architecture eliminates the data silos that commonly plague legacy 4–20 mA point-to-point wiring schemes, replacing them with a unified, protocol-consistent data fabric that spans from the field instrument level to the control room and beyond.

The 2MLR-AC22 supports up to 16 analog output channels per module, each independently configurable for range, fault state, and engineering unit scaling. Output signals are routed to final control elements such as control valves, variable frequency drives (VFDs), and electro-pneumatic positioners, enabling closed-loop regulatory control with sub-millisecond update rates. When paired with a Honeywell Series C Remote I/O (RIO) cabinet and an FTE switch infrastructure — typically built on managed industrial Ethernet switches supporting IEEE 802.1Q VLAN segmentation and IGMP snooping — the module's output data is simultaneously available to the Experion PKS server, the Uniformance Process History Database (PHD), and any OPC DA/UA client connected to the plant network. This multi-consumer data architecture is fundamental to achieving the real-time visibility and remote diagnostic capability demanded by Industry 4.0 smart factory initiatives.

From a system integration perspective, the 2MLR-AC22 participates in Honeywell's Control Execution Environment (CEE), where control strategies built in Experion's Control Builder engineering tool are downloaded directly to the C300 controller and executed at the module level. Alarm and event data generated by the module — including output deviation alarms, hardware fault notifications, and communication loss alerts — are propagated upstream through the FTE network to the Experion Alarm Manager, where they are time-stamped, prioritized, and routed to operator displays or forwarded to an enterprise historian such as the Honeywell Uniformance Asset Sentinel. This closed-loop alarm feedback mechanism ensures that process anomalies detected at the analog output level are immediately visible to control room operators and remote diagnostic engineers, supporting rapid fault isolation and minimizing mean time to repair (MTTR).

For facilities implementing a layered network architecture — with a process control network (PCN) at Level 2, a supervisory network at Level 3, and an enterprise integration layer at Level 3.5 — the 2MLR-AC22's data is accessible across all tiers via the Experion PKS server's built-in OPC UA server interface. This enables seamless data exchange with third-party SCADA platforms, MES systems, and cloud-based analytics engines without requiring additional protocol gateways or middleware. In applications where legacy Modbus RTU or HART field devices must coexist with the Experion PKS network, a Honeywell HART Multiplexer or a dedicated protocol gateway module can be inserted into the I/O chassis to provide transparent protocol conversion, preserving the investment in existing field instrumentation while extending the reach of the smart factory data network.

In a fully realized smart factory deployment, the 2MLR-AC22 sits at the intersection of field execution and network intelligence. At the lowest layer, field instruments — including Honeywell ST 800 SmartLine pressure transmitters, Rosemount 3051 differential pressure transmitters, and Yokogawa EJA series flow transmitters — feed process variable data upward through analog input modules such as the Honeywell 2MLR-AI22, where it is digitized and placed on the C300 controller's I/O link. The C300 controller processes this data against control strategies and issues corrective output commands to the 2MLR-AC22, which converts the digital setpoint back into a precision 4–20 mA signal for delivery to final control elements: Fisher FIELDVUE DVC6200 digital valve controllers, ABB ACS880 variable frequency drives managing pump and compressor speeds, and Rotork IQ3 electric actuators on isolation valves.

Simultaneously, the C300 controller publishes all process data — including the 2MLR-AC22's output values, channel health status, and deviation alarm states — onto the FTE network, where it is consumed by the Experion PKS server. The server aggregates data from all controllers across the plant and makes it available to Experion Station HMI clients in the control room, to remote operator workstations connected via a secure plant WAN, and to the Uniformance PHD historian for long-term trend storage. A Honeywell Experion HS gateway module bridges the Experion PKS network to higher-level enterprise systems, enabling the plant's MES platform and ERP system to access real-time production data without direct access to the process control network — maintaining the ISA-99 / IEC 62443 network segmentation required for industrial cybersecurity compliance.

For remote diagnostic scenarios, a Honeywell OneWireless field network or a dedicated industrial cellular gateway can extend visibility to field devices beyond the wired FTE infrastructure, feeding data back through the Experion PKS server to remote engineering workstations. Maintenance engineers can monitor the 2MLR-AC22's channel-level diagnostics — output current deviation, open-loop detection, and module temperature — from any OPC UA-enabled SCADA client, enabling predictive maintenance decisions without requiring physical access to the I/O cabinet. This end-to-end data chain, from the 4–20 mA field signal through the FTE network to the enterprise dashboard, represents the complete connectivity value of the 2MLR-AC22 in a modern smart factory environment.

Many industrial facilities operating legacy DCS or PLC architectures face persistent data gaps: analog output modules that lack network visibility, proprietary protocols that cannot communicate with modern SCADA platforms, and I/O subsystems that generate no diagnostic data beyond a simple hardware fault LED. The Honeywell 2MLR-AC22 addresses these challenges directly within the Experion PKS framework. Its integration with the FTE network means that every output channel's value, status, and alarm condition is continuously published to the control network — eliminating the blind spots that occur when field-level analog signals are invisible to the supervisory layer.

Protocol fragmentation — where legacy Modbus RTU devices, HART instruments, and modern Ethernet-based controllers coexist without a common data exchange standard — is resolved through the Experion PKS server's OPC UA interface, which presents all I/O data in a unified namespace accessible to any compliant client. Data islands created by isolated PLC subsystems or standalone remote I/O panels can be absorbed into the Experion PKS architecture by deploying additional Series C I/O chassis with 2MLR-AC22 modules, extending the FTE network to new areas of the plant without requiring a separate SCADA integration project. Alarm rationalization is simplified because all 2MLR-AC22 channel alarms are managed centrally in the Experion Alarm Manager, where alarm shelving, suppression, and escalation rules can be applied consistently across the entire plant. For facilities pursuing ISA-18.2 alarm management compliance or IEC 62443 cybersecurity certification, the 2MLR-AC22's network-native architecture provides the audit trail and data integrity foundation required by both standards.

Q1: What is the communication latency of the 2MLR-AC22 on the Experion PKS FTE network? The 2MLR-AC22 operates on Honeywell's Fault Tolerant Ethernet (FTE) network, which provides deterministic, sub-10 ms update rates for analog output channel data under normal plant network loading conditions. FTE's dual-redundant 100 Mbps architecture ensures that network failover — in the event of a cable fault or switch failure — occurs transparently within the controller scan cycle, with no perceptible impact on output signal continuity or SCADA data refresh rates.

Q2: Is the 2MLR-AC22 compatible with third-party SCADA and HMI platforms beyond Experion Station? Yes. The Experion PKS server exposes all I/O data — including 2MLR-AC22 output values and diagnostics — via an OPC DA and OPC UA server interface. Any SCADA or HMI platform with an OPC UA client (including Wonderware InTouch, Ignition by Inductive Automation, Siemens WinCC, and GE iFIX) can subscribe to 2MLR-AC22 data without requiring custom drivers or protocol gateways. For Modbus TCP integration, a third-party OPC-to-Modbus gateway can bridge the data to legacy systems.

Q3: How is the 2MLR-AC22 tested before shipment, and what warranty coverage is provided? Every 2MLR-AC22 unit supplied by NANKMOS undergoes pre-shipment functional testing, including channel-level output current verification across the full 4–20 mA range, FTE communication link validation, and hardware diagnostic self-test confirmation. All units are covered by a 12-month warranty from the date of shipment, with in-stock availability ensuring rapid delivery to minimize plant downtime. Replacement units are available from verified inventory for emergency procurement requirements.

Q4: Can the 2MLR-AC22 be expanded to support additional I/O points as the plant grows? Yes. The Experion PKS Series C I/O architecture is designed for modular expansion. Additional 2MLR-AC22 modules can be added to existing I/O chassis up to the chassis slot limit, or new Series C I/O chassis can be deployed in remote I/O cabinets connected to the FTE network via standard managed industrial Ethernet switches. The C300 controller supports up to 40 I/O modules per controller pair, and multiple C300 controllers can be deployed on a single FTE network segment, providing a scalable path from small process units to plant-wide DCS architectures without requiring system re-engineering.