OPTO 22 001818K AC24 AT Thermocouple Input Module

Product Details

001818K AC24 AT Product Description

The OPTO 22 001818K AC24 AT is a high-precision thermocouple input module engineered for demanding industrial environments where accurate temperature data is the backbone of process control and smart factory connectivity. Designed to operate within the OPTO 22 G4 I/O platform, this module bridges the gap between field-level sensing devices and upper-layer control systems — delivering real-time thermal data across the full automation data chain, from signal acquisition at the sensor level all the way through to SCADA dashboards and enterprise MES platforms.

In modern smart manufacturing, temperature data is not merely a process variable — it is a critical input for predictive maintenance, energy optimisation, alarm management, and production quality assurance. The 001818K AC24 AT is purpose-built to serve this role, accepting thermocouple inputs and converting them into clean, protocol-ready signals that can be consumed by PLC controllers, remote I/O racks, HMI terminals, and industrial gateways without signal degradation or communication latency.

The OPTO 22 001818K AC24 AT sits at the front end of the industrial data chain, where thermocouple sensors — measuring furnace temperatures, motor winding heat, coolant loop conditions, or ambient process zones — feed raw millivolt signals into the module's precision analog input circuitry. The module performs cold-junction compensation and linearisation internally, producing a calibrated engineering-unit value that is immediately available to the host controller.

Within a typical OPTO 22 SNAP PAC architecture, the 001818K AC24 AT mounts into a SNAP PAC EB-series Ethernet brain rack, which aggregates data from multiple I/O modules — including digital input modules for discrete sensor states, analog output modules for valve positioner control, and serial communication modules for legacy device integration. The SNAP PAC brain transmits all I/O data over Ethernet to a SNAP PAC R-series controller, where ladder logic or flowchart programs execute closed-loop temperature control algorithms in real time.

From the controller layer, data flows upward via Modbus TCP or OPC-UA to SCADA platforms such as Ignition by Inductive Automation or Wonderware, where operators monitor temperature trends, configure alarm thresholds, and generate compliance reports. The same data stream can be simultaneously routed to groov View HMI panels — OPTO 22's browser-based operator interface — providing plant-floor technicians with live temperature readings without requiring dedicated HMI hardware.

For facilities adopting IIoT architectures, the 001818K AC24 AT integrates seamlessly with the groov EPIC processor, OPTO 22's edge programmable industrial controller, which combines I/O, control, and edge computing in a single DIN-rail unit. The groov EPIC can publish temperature data via MQTT to cloud platforms such as AWS IoT, Microsoft Azure, or on-premise historians, enabling remote diagnostics, machine learning-based anomaly detection, and digital twin synchronisation across distributed factory sites.

In multi-zone process plants, the 001818K AC24 AT is commonly deployed alongside SNAP PAC analog output modules for PID loop control, SNAP serial communication modules for integrating legacy RS-485 instruments, and industrial managed Ethernet switches that segment the control network from the enterprise IT backbone. This layered network design ensures that temperature data from the field reaches the SCADA historian with deterministic latency, even under high network load conditions.

Where variable-speed drives control heating elements or cooling fans, the 001818K AC24 AT's temperature readings serve as the primary feedback signal for drive speed adjustment — closing the loop between thermal process conditions and motor output. Integration with OPTO 22 groov RIO remote I/O modules further extends the data acquisition reach to geographically distributed measurement points, all managed from a centralised SCADA or MES platform without additional field controllers.

Protocol Fragmentation: Many industrial sites operate a mix of legacy serial instruments alongside modern Ethernet-based controllers. The OPTO 22 G4 platform, anchored by modules like the 001818K AC24 AT, resolves this by providing a unified I/O layer that translates field-level analog signals into Modbus TCP and OPC-UA data objects — eliminating the need for standalone protocol converters and reducing network complexity.

Data Silos and Production Transparency: Temperature data trapped in standalone PLCs or paper-based logs cannot contribute to production optimisation. By connecting the 001818K AC24 AT to a SNAP PAC controller with SCADA integration, all thermocouple readings become part of a centralised data historian, enabling cross-zone temperature correlation, shift-based trend analysis, and real-time production transparency dashboards accessible to both plant engineers and remote management teams.

Remote Monitoring and Alarm Management: Undetected thermal excursions cause equipment damage, product loss, and safety incidents. The 001818K AC24 AT, when integrated with OPTO 22's PAC Control software, supports configurable alarm thresholds with automatic notification routing — sending alerts via email, SMS gateway, or SCADA alarm server the moment a temperature deviation is detected, enabling rapid remote response without requiring on-site personnel.

System Scalability: As production capacity grows, additional 001818K AC24 AT modules can be added to existing SNAP PAC racks without controller replacement or network reconfiguration. The modular G4 architecture supports incremental expansion, protecting the initial infrastructure investment while accommodating new measurement points, additional process zones, or integration with new equipment lines.

Q1: What communication protocols does the OPTO 22 001818K AC24 AT support for SCADA integration? The 001818K AC24 AT is an analog input module that interfaces with OPTO 22 SNAP PAC or groov EPIC controllers. These controllers natively support Modbus TCP, EtherNet/IP, and OPC-UA, making the module's thermocouple data directly accessible to SCADA platforms such as Ignition, Wonderware, and FactoryTalk without additional protocol gateways.

Q2: Is the 001818K AC24 AT compatible with third-party PLCs or only OPTO 22 systems? The module is designed for the OPTO 22 G4 rack system and requires a compatible SNAP PAC brain or groov EPIC I/O chassis. For integration with third-party PLCs (e.g., Siemens S7, Allen-Bradley ControlLogix), the SNAP PAC controller acts as a data concentrator, exposing thermocouple values via Modbus TCP or OPC-UA to the upstream PLC or DCS.

Q3: How does the system maintain network stability and data integrity under continuous operation? OPTO 22 SNAP PAC systems use deterministic Ethernet communication with watchdog timers and automatic reconnection logic. The 001818K AC24 AT module performs continuous self-diagnostics, and the SNAP PAC brain monitors I/O module health in real time — flagging communication faults to the SCADA alarm system immediately, ensuring data integrity is maintained across 24/7 production cycles.

Q4: What warranty and pre-shipment testing does NANKMOS provide for the 001818K AC24 AT? All OPTO 22 001818K AC24 AT units supplied by NANKMOS carry a 12-Month Warranty covering manufacturing defects and functional failures under normal operating conditions. Each unit undergoes pre-shipment functional verification before dispatch. In-stock units are available for immediate shipment, with lead-time confirmation provided at the time of order. For volume procurement or project-specific requirements, contact our technical team directly.