ABB CI801

Description

Detailed parameter table

ABB CI801

Product introduction

The CI801 is a dedicated Modbus communication module from ABB, engineered to enable seamless data exchange between ABB’s AC800M controller and Modbus-enabled field devices. As a key component of the S800 I/O system, it acts as a translator, converting data between the controller’s internal protocol and Modbus RTU/ASCII, which are widely used in industrial sensors, actuators, and legacy equipment.

Designed for flexibility, the CI801 integrates effortlessly with the AC800M controller, supporting both cyclic data transmission (for real-time control) and acyclic communication (for configuration and diagnostics). Its compact form factor and rugged build make it suitable for harsh industrial environments, from chemical plants to water treatment facilities, where reliable communication is critical for process efficiency and safety.

Core advantages and technical highlights

Dual-protocol support

The CI801 handles both Modbus RTU and ASCII, eliminating the need for separate modules for different Modbus variants. In a factory with mixed equipment—some using RTU for fast data exchange and others using ASCII for text-based commands—the CI801 ensures all devices communicate smoothly with the AC800M controller. This versatility reduces hardware costs and simplifies system design.

Configurable data rates

With adjustable speeds from 300 bps to 115.2 kbps, the CI801 adapts to network requirements. For long cable runs in a mining operation, it can slow to 9600 bps to reduce signal loss, while in a high-speed packaging line, it can operate at 115.2 kbps for rapid updates from conveyor sensors. This adaptability ensures optimal performance in diverse installations.

Robust industrial design

Built to withstand extreme temperatures (-25°C to +70°C) and electrical noise, the CI801 delivers consistent performance in challenging environments. Its 2.5 kV AC isolation protects the controller from voltage spikes in the field wiring, a common issue in factories with large motors. This durability minimizes unplanned downtime, a key advantage in 24/7 production facilities.

Typical application scenarios

In a chemical processing plant, the CI801 serves as the communication link between the AC800M controller and a network of Modbus devices:

• 4-20 mA pressure transmitters (converted to Modbus RTU)
• Temperature controllers with ASCII output
• Solenoid valve banks with Modbus RTU feedback

The CI801 transmits real-time pressure and temperature data to the controller, which uses this information to adjust valves via AO801 modules. If a valve reports a fault via Modbus, the CI801 relays this to the controller, triggering an alarm (via DO910) and preventing unsafe pressure buildup.

In a wastewater treatment plant, the CI801 connects legacy flow meters (using Modbus ASCII) to the modern AC800M system. It enables the controller to log flow data for regulatory compliance while sending setpoints to the meters, avoiding the cost of replacing functional but older equipment.

ABB CI801

Related model recommendations

• CI810B: A Profibus DP module that, like the CI801, expands the AC800M’s communication capabilities but for Profibus networks.
• TB820V2: A terminal base that provides secure wiring connections for the CI801, simplifying installation and maintenance.
• AI810: An analog input module that works with the CI801by sending sensor data to the controller, which then adjusts Modbus devices via the CI801.
• AO801: An analog output module that receives commands from the controller, while the CI801monitors the status of Modbus-enabled actuators.
• CI854A: An Ethernet/IP module that complements the CI801in hybrid networks, connecting Modbus and Ethernet devices to the controller.

Installation, commissioning and maintenance instructions

Installation preparation

Before installing the CI801, ensure the control cabinet is clean and dry, with ambient temperatures between -25°C and +70°C. Use shielded twisted-pair cables (0.5-1.5 mm²) for the RS485 bus, grounding shields at both ends to reduce noise. Mount the CI801 on a 35 mm DIN rail, leaving 15 mm of space for ventilation. Connect power (24 V DC) via the terminal block, verifying polarity to avoid damage.

Maintenance suggestions

Daily checks involve verifying the CI801’s LEDs: green for power, flashing green for communication, and red for faults. If a red LED appears, check for loose connections or overloaded buses (more than 32 slaves). Quarterly, inspect terminal blocks for corrosion and tighten if needed. Clean the module with compressed air to remove dust.

For communication issues, use ABB’s configuration software to check baud rates and parity settings—mismatches are a common cause of failures. If the CI801 fails, replace it with an ABB-approved spare, ensuring it’s configured with the same protocol and speed settings as the original to minimize downtime.

Service and guarantee commitment

The CI801 comes with a 3-year warranty, covering defects in materials and workmanship. ABB’s technical support team provides 24/7 assistance for installation, configuration, and troubleshooting, including guidance on integrating with AC800M controllers and Modbus devices.

Customers receive access to detailed manuals and software tools for seamless setup. Extended service contracts offer on-site support and priority response times, ensuring the CI801 remains reliable throughout its lifecycle. ABB’s global network ensures fast delivery of spare parts, reducing downtime in critical applications. With the CI801, customers gain a communication solution backed by ABB’s decades of expertise in industrial automation.