ABB 07KR51-HSB is a hot standby redundant CPU based on the 50-series central unit. It is specially designed for the CS31 bus and supports master/slave hot standby function. When the master station fails, the slave station can take over control within 3 cycles to ensure uninterrupted production processes. It integrates 8 channels of digital input (24V DC) and 6 channels of relay output, suitable for industrial automation scenarios requiring high reliability. 100% brand new original, with a 1-year warranty.