SIMADYN D Digital Control System Interface board SB31
The SB31 interface board is used in the SIMADYN D system as changeover function for the SB30 and SA30 output boards. The SB30 and SA30 interface boards switch the output signals of two redundant SIMADYN D systems over when a system fails. The SB31 interface board evaluates up to eight output signals of the two redundant SIMADYN D systems, and supplies the changeover signal for the SB30 and SA30 interface boards when the active system fails. If the redundant system has also failed, a changeover is not made. The eight associated binary inputs of the interface board must be at a high signal level in order to be able to identify correct operation of the SIMADYN D system. The SIMADYN D system is identified as being faulty if one input does not have a high signal level.
User Manual for Interface board SB31 has 3 editions: