Honeywell 2MLL-C22B-CC PLC CPU Module – MasterLogic Series

Honeywell 2MLL-C22B-CC — MasterLogic PLC CPU Module with Integrated CC-Link Fieldbus Interface

The Honeywell 2MLL-C22B-CC is a rack-mount central processing unit module within the MasterLogic programmable logic controller platform, purpose-built for deterministic process control in continuous and batch manufacturing environments. Unlike general-purpose embedded controllers, the MasterLogic CPU architecture is structured around a synchronous scan cycle engine that enforces fixed-interval task execution — a design requirement in applications where control loop jitter directly translates to product quality deviation or process safety risk.

The -CC suffix in the part number designates a factory-integrated CC-Link fieldbus interface, eliminating the need for a discrete communication module and reducing backplane slot consumption. CC-Link (Control & Communication Link) operates at up to 10 Mbps across a maximum network distance of 1,200 m (at 156 kbps), supporting up to 64 remote stations per master. This embedded interface allows the 2MLL-C22B-CC to function as a CC-Link master, coordinating distributed I/O, remote terminal units, and intelligent field devices without an intermediary gateway — a topology that reduces latency and simplifies network diagnostics.

Within the MasterLogic rack, the CPU communicates with I/O modules via a proprietary high-speed backplane bus. This internal bus architecture supports deterministic data exchange between the CPU and local I/O at scan rates that are decoupled from the external fieldbus cycle, ensuring that local control loops are not subject to network-induced variability. The module mounts directly into the MasterLogic base unit and draws operating power from the rack power supply, with no external power connection required at the module level.

The 2MLL-C22B-CC is deployed across oil & gas pipeline automation, chemical plant distributed control, pharmaceutical batch sequencing, and utility load management — environments where the cost of an unplanned shutdown far exceeds the cost of the control hardware itself. Its position in the MasterLogic ecosystem means it integrates natively with Honeywell Experion PKS supervisory systems, enabling end-to-end data continuity from field device to historian without protocol translation layers.

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Technical Parameters

Hardware Logical Analysis

The 2MLL-C22B-CC implements a dual-layer execution architecture that separates the real-time control task from communication handling at the hardware level. The CPU core runs the PLC scan cycle on a dedicated processor, while the CC-Link interface is managed by a co-processor with its own memory buffer. This physical separation means that a burst of CC-Link traffic — such as a diagnostic poll from a SCADA system — does not insert wait states into the control scan cycle. The result is a CPU whose worst-case scan time deviation is bounded by the internal bus arbitration logic rather than by external network load.

The backplane bus in the MasterLogic platform uses a time-division multiplexing scheme to schedule data transfers between the CPU and each I/O module slot. Each slot is allocated a fixed time window per scan cycle, and the CPU reads all I/O image data in a single atomic operation at the start of each scan. This eliminates the partial-update problem seen in asynchronous bus architectures, where I/O data written mid-scan can produce inconsistent logic states within a single program cycle.

From an EMC standpoint, the module’s PCB layout isolates the CC-Link transceiver circuitry from the CPU logic plane using a ground-plane partition and series termination resistors on all high-speed signal lines. The CC-Link physical layer uses RS-485 differential signaling, which provides inherent common-mode noise rejection — a critical property in industrial cabinets where variable-frequency drives and high-current contactors generate broadband electromagnetic interference. The module housing is designed to mate with the MasterLogic rack’s shielded backplane connector, providing a continuous ground path that suppresses conducted emissions at the module interface.

The -CC hardware revision (B) incorporates updated firmware ROM compared to the earlier -CC revision (A), with improvements to the CC-Link station management state machine. Specifically, the B revision reduces the time required to re-establish communication with a dropped remote station, which is relevant in applications where a field device may be temporarily powered down for maintenance without requiring a full network restart.

System Integration Benefits

• Zero-slot CC-Link master: The integrated fieldbus interface preserves backplane slots for I/O expansion, allowing the rack to reach maximum I/O density without dedicating a slot to a communication module.
• Deterministic scan cycle: Fixed-interval task execution with bounded jitter supports closed-loop PID control at update rates consistent with process dynamics in chemical and pharmaceutical applications.
• Native Experion PKS integration: Direct OPC-DA and OPC-UA data paths to Honeywell Experion PKS eliminate the need for third-party protocol gateways, reducing configuration complexity and potential data integrity issues.
• IEC 61131-3 compliance: Programs written in LD, FBD, or ST are portable across MasterLogic CPU variants, reducing re-engineering effort when upgrading hardware revisions.
• Structured diagnostic reporting: The CPU exposes module-level fault codes via the CC-Link network status registers, enabling SCADA systems to identify the specific station and error type without requiring a physical inspection of the cabinet.
• Hot-swap compatible rack design: When used with a MasterLogic redundancy module, the CPU supports bumpless transfer to a standby unit, maintaining process continuity during planned maintenance windows.
• Scalable network topology: CC-Link master capability supports up to 64 remote stations, accommodating distributed I/O architectures across large plant footprints without requiring a secondary fieldbus master.
• Firmware-level watchdog: An independent hardware watchdog timer monitors CPU scan cycle completion. If the scan cycle exceeds the configured timeout — due to a program error or hardware fault — the watchdog forces all outputs to a defined safe state, independent of the application program.

Quality Assurance & Global Logistics

Every Honeywell 2MLL-C22B-CC unit dispatched from our Xiamen, China facility undergoes a structured pre-shipment verification process. Label authenticity is checked against Honeywell’s current part marking standards, including holographic security features where applicable. Date codes are recorded and cross-referenced against known production windows to identify counterfeit or remarked components. Where test equipment is available, modules are subjected to a power-on functional check to confirm that the CPU initializes correctly and that the CC-Link interface responds to a network scan.

Packaging follows IEC 61340-5-1 electrostatic discharge protection requirements: modules are placed in conductive anti-static bags, cushioned with foam inserts rated for the module’s weight class, and boxed in double-wall corrugated cartons. Shipments to international destinations are accompanied by a commercial invoice, packing list, and — on request — a certificate of conformance and traceability documentation.

From Xiamen, we ship via DHL Express, FedEx International Priority, and UCP air freight, with typical transit times of 3–7 business days to Europe, North America, Southeast Asia, and the Middle East. For time-critical orders, same-day dispatch is available for in-stock units confirmed before 14:00 CST. All shipments are fully insured and tracked from dispatch to delivery confirmation.

Our 12-month warranty covers defects in materials and workmanship under normal operating conditions. Warranty claims are processed within 5 business days of receipt of the returned unit, with replacement or credit issued upon verification of the defect.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
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