Binary inputs and outputs 

The REF 542plus unit acquires the primary objects status with auxiliary contacts, which are read by binary inputs, and sends commands using binary outputs. Several signals coming from other components are also monitored. Among others, the following operations are implemented using binary inputs and outputs: 

• primary objects control and interlocking in the switchgear

 • primary objects status acquisition (for example circuit breaker in opened/closed position) 

• circuit breaker spring supervision (when applicable). Binary inputs are isolated by opto-couplers. Binary outputs can be implemented either with mechanical relays or with static (semiconductor) devices. In a switchgear with directly driven motors, static power outputs are usually required.

 Life Cycle Traceability 

This feature will enable the management of the whole product life cycle, from the ordering until the refurbishment phase, by using a software structure within the ABB organization to automatically collect, store and retreive the relevant data, e.g. hardware module composition, software version etc. Therefore the firmware of each REF 542plus terminal is extended for detection of changes in the hardware composition or in the firmware. Due to the existing history record, technical support and services as well as repairs can be provided by ABB within the shortest possible time. 

Interfacing a station automation system 

An optional communication module can be provided for interfacing a station automation system. The four different protocols available for the REF 542plus make possible to interface any kind of station automation system, both from ABB or from third parties. The following typical functions are possible:

 • primary objects status monitoring 

• primary objects control 

• protections parameterization 

• measurements, alarms end events acquisition 

• fault recorder data acquisition. The available protocols are: 

• SPA • ABB LON according to LON Application Guide (LAG) 1.4 definitions