Applied Materials RAYMID10LTCB3 Retrofit IR Module for Legacy Systems

Applied Materials RAYMID10LTCB3 Retrofit IR Module for Legacy Systems

The Applied Materials RAYMID10LTCB3 is a ruggedized infrared thermometer communication module from the Raytek Marathon MID series, engineered for non-contact temperature measurement in demanding industrial environments. As a retrofit-compatible replacement unit, the RAYMID10LTCB3 addresses the growing challenge faced by maintenance engineers and system integrators who must sustain legacy temperature monitoring infrastructure without disrupting active production lines. Whether you are replacing a failed communication board in an existing Marathon MID installation, upgrading a legacy control cabinet to support modern serial communication protocols, or extending the service life of a discontinued temperature measurement system, the RAYMID10LTCB3 provides a direct-fit solution backed by verified pre-shipment testing and a 12-month warranty.

The CB3 communication board variant integrates RS-485 and RS-232 serial interfaces, enabling seamless data exchange with PLCs, DCS controllers, and SCADA systems that rely on Modbus RTU or proprietary Raytek communication protocols. For facilities running older Siemens S5 or S7 series PLCs, Allen-Bradley SLC 500 controllers, or GE Fanuc Series 90 systems, the RAYMID10LTCB3 can be configured to match existing baud rates, parity settings, and device addresses without requiring changes to the host control program. This compatibility is critical in retrofit scenarios where rewriting PLC ladder logic or function block diagrams would introduce unacceptable project risk and extended downtime.

Upgrade Compatibility Table

Retrofit Planning for Existing Automation Systems

Successful integration of the RAYMID10LTCB3 into a legacy automation system requires a structured pre-retrofit assessment. Begin by auditing the existing control cabinet layout to confirm available installation space, backplane slot assignments, and cable routing paths. In many legacy installations, the Marathon MID sensor head — such as the RAYMID10LT base unit — remains serviceable while only the communication board has failed or become obsolete. In these cases, replacing only the CB3 communication module avoids the cost and complexity of replacing the entire sensor assembly.

For systems where the earlier RAYMID10LTCB1 communication board was originally installed, the CB3 variant offers expanded protocol support and improved noise immunity on long RS-485 cable runs. Engineers should verify terminal block wiring assignments against the original CB1 wiring diagram, as pin assignments for the TX, RX, and GND lines may differ between board revisions. A signal isolator — such as a DIN rail-mounted galvanic isolator for RS-485 — is recommended when cable runs exceed 50 metres or when the sensor is installed near high-voltage drive cabinets.

In control systems where the RAYMID10LTCB3 feeds temperature data to a Yokogawa DCS or a Beckhoff EtherCAT I/O network, a protocol gateway or serial-to-Ethernet converter may be required to bridge the RS-485 Modbus RTU output to the host network. Devices such as Moxa NPort serial device servers or similar industrial gateways are commonly used in this migration path. Confirm IP addressing, baud rate, and Modbus slave ID settings before commissioning to avoid address conflicts with other field devices on the same serial bus.

Where the RAYMID10LTCB3 is integrated into a broader temperature monitoring upgrade — for example, alongside a RAYMI31001 Marathon MI series sensor or a RAYCI3ACBSF Compact CI series unit — ensure that each device is assigned a unique Modbus address and that the host PLC or DCS polling cycle is adjusted to accommodate the additional device. Analog output signals from the 4–20 mA channel should be wired to dedicated AI channels on the I/O rack; avoid sharing a single AI channel between multiple sensors through passive signal splitters, as this degrades measurement accuracy.

For HMI panel integration, update the SCADA or HMI tag database to reflect the new device address and register map of the RAYMID10LTCB3. Legacy HMI screens built on Siemens WinCC, Wonderware InTouch, or iFIX may require tag remapping if the original communication board used a different register layout. Retain a backup of the original HMI project before making changes, and perform a full I/O check with the sensor in a safe, non-process state before returning the line to production.

Power supply capacity is a frequently overlooked factor in retrofit projects. The RAYMID10LTCB3 draws 24 VDC from the cabinet power rail. If the existing DIN rail power supply — such as a Phoenix Contact QUINT or a Siemens SITOP unit — is already operating near its rated output current, adding the communication module may trigger overcurrent protection. Calculate the total load on the 24 VDC rail, including all PLCs, I/O modules, relays, and communication devices, and add a dedicated PSU if the margin is less than 20%.

Programming cable compatibility should also be confirmed before on-site commissioning. The Raytek DataTemp Multidrop software, used for configuring Marathon MID series devices, communicates via a dedicated RS-232 programming cable. Ensure the laptop or configuration terminal used on-site has a compatible COM port or USB-to-RS-232 adapter, and that the DataTemp software version supports the CB3 firmware revision installed on the RAYMID10LTCB3.

Downtime Control During System Migration

Minimising production downtime during a communication module replacement requires careful pre-migration preparation. Before removing the existing communication board, document all current configuration parameters: device address, baud rate, parity, stop bits, temperature range calibration offsets, and analog output scaling. Use the DataTemp Multidrop software to export the device configuration file if the existing board is still partially functional.

Where possible, pre-configure the replacement RAYMID10LTCB3 on a bench test setup before the scheduled maintenance window. Connect the module to a laptop via the RS-232 programming cable, load the saved configuration file, and verify that the device responds correctly to Modbus read commands. This bench validation step eliminates the risk of discovering configuration errors during the live maintenance window, when time pressure is highest.

During the physical swap, follow lockout/tagout (LOTO) procedures for the sensor and associated control circuits. Label all terminal connections before disconnecting wiring, and photograph the original wiring layout as a reference. Re-terminate connections to the RAYMID10LTCB3 terminal block in the same order, verify continuity with a multimeter, and restore power in a controlled sequence — power supply first, then the PLC or DCS, then the sensor communication module.

After power restoration, confirm that the host PLC or DCS is receiving valid temperature data from the RAYMID10LTCB3 before releasing the line to production. Check for communication error flags in the PLC diagnostic buffer, verify that the analog 4–20 mA output is within the expected range for the current process temperature, and confirm that HMI displays are updating correctly. A brief soak period of 15–30 minutes under normal operating conditions is recommended before declaring the retrofit complete.

Retrofit Support FAQ

Q: Is the RAYMID10LTCB3 a direct replacement for the RAYMID10LTCB1 communication board?
A: The CB3 variant is functionally compatible with the CB1 in most Marathon MID installations, but terminal wiring assignments and firmware register maps may differ between revisions. Always compare the wiring diagrams for both variants before re-terminating connections, and update the host PLC communication driver if the Modbus register layout has changed.

Q: What pre-shipment testing is performed on the RAYMID10LTCB3?
A: Each unit undergoes functional verification prior to dispatch, including power-on self-test, serial communication response check, and analog output calibration verification. A test report is available upon request. The unit is covered by a 12-month warranty against manufacturing defects from the date of shipment.

Q: Can the RAYMID10LTCB3 communicate with a Modbus TCP/IP network directly?
A: The RAYMID10LTCB3 natively supports Modbus RTU over RS-485 and RS-232. For integration with Modbus TCP/IP networks, a serial-to-Ethernet gateway is required. Industrial-grade serial device servers are widely available and provide transparent protocol conversion without requiring changes to the sensor configuration.

Q: What is the stock availability and lead time for the RAYMID10LTCB3?
A: The RAYMID10LTCB3 is held in service-ready inventory. Standard orders are dispatched within 3–5 business days. For urgent requirements or bulk procurement, contact our team directly to confirm current stock levels and arrange priority dispatch. Long-term supply agreements and reserved inventory arrangements are available for facilities with ongoing retrofit programmes.