Description
NTCL01 (material number 6636997D1, German Abschlusseinheit means “terminal unit”) is a communication terminal board in ABB INFI 90/Advant series control systems. Its core function is to provide electrical terminal matching for INFI-NET communication networks or factory loops, eliminate bus signal reflections, and ensure signal integrity of communication links.
ABB NTCL01 6636997D1 Abschlusseinheit
core functionality
NTCL01 is essentially a communication bus terminator. In an INFI-NET network, a terminator must be connected at each end of the bus to match the characteristic impedance (usually 93 Ω or 120 Ω), otherwise the signal will reflect at the end of the bus, causing communication errors or even the entire network to collapse. NTCL01 is the hardware node responsible for this terminal matching task. At the same time, it also provides physical connection endpoints for network interface slave modules (INNIS01) or loop interface modules (INLIM03), enabling these interface modules to connect to the INFI-NET backbone network or factory circuits.
connection method
Onboard jumpers are used to select communication cable types: Twinax or Coax. Through jumper configuration, the same NTCL01 can adapt to different physical layer media, simplifying spare parts management. It connects INNIS01 or INLIM03 to the INFI-NET communication network, and can also connect LIM to the factory circuit. It is a plug and play device that does not require additional software configuration.
affiliated system
NTCL01 belongs to the communication infrastructure layer of ABB INFI 90 system (later evolved into Advant OCS), deployed in the aPCU (Application Process Control Unit) rack. In INFI-NET network topology, it is usually installed at the physical end of the bus and works in conjunction with the terminal at the other end. INFI-NET is a token passing high-speed fieldbus used to connect controllers, I/O stations, operator stations, and engineering tools, with a transmission rate of up to 10Mbps.
Electrical Characteristics
The working power is provided by the rack bus, and the module implements electrical isolation between the communication side and the system side, effectively blocking the impact of on-site grounding circuits and transient interference on the controller. Equipped with overvoltage protection and surge protection. Automatically detect the electrical ID of the module when powered on, and refuse to enter the running state when it does not match the system configuration, to prevent communication failures caused by mismatches.
Physical specifications
Standard printed circuit board, installed in the aPCU rack of the INFI 90 system, compact in size. The onboard LED indicator lights display real-time communication status and fault conditions, making it easy to quickly locate problems on site. Supports hot swapping and can be replaced without interrupting INFI-NET communication when the rack is powered on.
Typical application scenarios
Mainly used for brownfield sites such as power plants, petrochemical plants, pulp and paper mills that are still operating ABB INFI 90 systems. In these scenarios, NTCL01 ensures deterministic synchronous communication between the HMI screen updates, alarm propagation, and historical data recording of the operator station and the on-site control layer, enabling stable operation even in high electrical noise environments. It can also be used in configurations that require remote I/O connection through factory circuits.
Regarding the suffix D1 of material number
The D1 in 6636997D1 usually indicates that this version is at a specific revision level and may differ from earlier versions (such as L1) in terms of terminal layout or jumper configuration. When replacing, it is necessary to confirm compatibility with the existing INNIS01/INLIM03 module.
