ABB CI853K01 3BSE018103R1 Retrofit-Ready RS232-C for AC 800M

ABB CI853K01 3BSE018103R1 Retrofit-Ready RS232-C Module for AC 800M Control Systems

The ABB CI853K01 (part number 3BSE018103R1) is a dual-port RS232-C serial communication module engineered for the AC 800M Modular Controller platform. As legacy AC 800M installations approach end-of-life support cycles, the CI853K01 has become one of the most sought-after retrofit and replacement components for engineers tasked with modernizing distributed control systems (DCS) and process automation architectures without full platform migration. Whether you are replacing a failed unit, upgrading communication capacity, or restoring a discontinued spare, the CI853K01 delivers seamless backward compatibility with existing AC 800M backplane infrastructure.

The module slots directly into the AC 800M controller rack alongside companion modules such as the PM861AK01 processor module, the CI854AK01 PROFIBUS DP communication interface, and the CI855K01 Ethernet communication module. In multi-module configurations, engineers frequently pair the CI853K01 with the TB807 terminal base and the SD821 power supply unit to maintain stable rack-level power distribution during retrofit operations. Understanding the interaction between these components is critical before initiating any field replacement.

Upgrade Compatibility Table

Retrofit Planning for Existing Automation Systems

Successful retrofit of the CI853K01 into an operating AC 800M system requires methodical pre-installation planning. Begin by auditing the existing rack configuration: document the slot positions of all installed modules, including the PM861AK01 processor, any CI854AK01 PROFIBUS DP interfaces, and existing CI853 serial modules. Confirm that the SD821 or SD822 power supply unit has sufficient headroom to support the replacement module — the AC 800M backplane distributes 24 VDC internally, and adding or swapping modules without verifying the power budget can cause unexpected controller resets.

Terminal wiring is the most common source of commissioning delays during serial module replacement. The CI853K01 connects to field devices through the TB807 terminal base. Before removing the legacy module, photograph and document all field cable terminations. RS232-C wiring is polarity-sensitive, and incorrect TX/RX/GND assignments will prevent serial communication from establishing after the swap. If the existing installation uses a custom cable harness to interface with third-party HMI panels or SCADA gateways, verify the pinout against the CI853K01 hardware manual before proceeding.

Module address assignment is handled through ABB Control Builder M software. After physically installing the CI853K01, perform a hardware scan in CBM to detect the new module. Re-import or update the hardware configuration file to reflect the replacement, and verify that the module address matches the address referenced in the application program. Mismatched addresses will cause the controller to report a hardware fault and may prevent the application from running. If the original CI853 was configured with a specific serial communication function block — for example, a Modbus RTU master block polling a flow meter or a third-party variable frequency drive — confirm that the function block parameters (baud rate, parity, stop bits, station address) are correctly mapped to the new module instance.

HMI screen updates are often overlooked during serial module retrofits. If the existing operator interface — whether an ABB Panel 800 HMI or a third-party SCADA system — displays communication status or diagnostic data sourced from the CI853 module, verify that the tag addresses and communication paths remain valid after the replacement. In systems where the CI853K01 serves as the serial gateway between the AC 800M controller and a legacy third-party device such as a Modbus RTU energy meter or a serial-connected barcode reader, the HMI communication link must be re-validated after commissioning.

Downtime Control During System Migration

Minimizing unplanned downtime is the primary operational concern when replacing a communication module in a live production environment. The CI853K01 replacement procedure can typically be completed within a planned maintenance window of 2–4 hours when pre-commissioning steps are completed in advance. The following approach is recommended to protect program logic and maintain field control continuity:

First, export and back up the complete AC 800M application project from Control Builder M before initiating any hardware changes. This backup preserves all function block configurations, serial communication parameters, I/O mappings, and controller task schedules. Store the backup on an offline engineering workstation and verify the export is complete before proceeding.

Second, place the AC 800M controller in a controlled stop state using the CBM online interface. Do not remove the CI853K01 while the controller is in RUN mode, as this may cause the processor module to log a hardware fault and trigger an uncontrolled shutdown of connected field devices. In systems where the serial link carries critical process data — for example, a Modbus RTU connection to a flow controller or a serial interface to a third-party safety relay — coordinate the module swap with the process control team to ensure field devices are placed in a safe state before communication is interrupted.

Third, after installing the replacement CI853K01 and completing terminal wiring verification, perform a cold restart of the AC 800M controller and allow the hardware scan to complete before downloading the application. Confirm that the new module appears in the CBM hardware tree with the correct slot address and no fault indicators before initiating the application download. Once the application is running, verify serial communication by monitoring the function block diagnostic outputs and confirming that field device responses are received within the expected cycle time.

Retrofit Support FAQ

Q: Is the CI853K01 3BSE018103R1 a direct drop-in replacement for the earlier CI853 revision?
A: Yes. The CI853K01 is mechanically and electrically compatible with the earlier CI853 module. It uses the same TB807 terminal base, the same backplane connector, and the same module bus interface. No hardware adapters or wiring modifications are required. After installation, a hardware configuration update in Control Builder M is necessary to register the new module revision.

Q: What pre-shipment testing is performed on the CI853K01 before delivery?
A: Each CI853K01 unit undergoes functional verification prior to shipment, including power-on self-test, backplane interface continuity check, and serial port loopback testing. Units are supplied with a 12-month warranty covering manufacturing defects. Test records are available upon request for quality-critical applications.

Q: Can the CI853K01 support Modbus RTU communication with third-party field devices?
A: Yes. The CI853K01 RS232-C ports support Modbus RTU master and slave configurations when implemented through the appropriate ABB Control Builder M function blocks. Baud rate, parity, stop bits, and station address are all configurable in software. Confirm that the field device baud rate and protocol settings match the CBM configuration before commissioning.

Q: What should I verify regarding rack power capacity before installing the CI853K01?
A: The CI853K01 draws power from the AC 800M backplane, supplied by the SD821 or SD822 power supply unit. Before installation, calculate the total power consumption of all modules in the rack and confirm that the power supply unit’s output capacity is not exceeded. ABB publishes rack power budget calculation guidelines in the AC 800M Hardware Configuration and Maintenance manual. If the existing power supply is operating near its rated capacity, consider upgrading to the SD822 before adding the replacement module.

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