PROFIBUS Redundancy Switch

HIGHLIGHTS

• A double address conflict cannot occur, even if the failed DP Master is still active on the PROFIBUS level
• Realisation of very complex redundancy systems, i.e. in connection with PROFIBUS OPC Servers or overlying Ethernet based cell networks
• PRS can be controlled via both integrated Ethernet connections if direct control via the PROFIBUS is not possible
• There is no single point of failure with the PRS as the Master to Slave communication would continue without interruption if the device does develop a fault

DESCRIPTION

In times of just in time production as well as increased safety requirements plants have to imply redundancy. In case of failure of the operational system the complete control function must be taken over by a stand-by system. The optimal solution is PRS – PROFIBUS DP Redundancy Switch

PRS is a compact 24 Volt hat rail module containing the switching logic as well as an intelligent double DP Slave. The device allows the connection of two DP Masters and the PROFIBUS connection to the DP Slaves. The Switch controls the status of the operational DP Master system on the PROFIBUS protocol and application level.In case of failure of the operational Master the device physically switches over to the stand-by Master, which seamlessly takes over the DP Slaves.

In contrast to the established Flying Master principle a double address conflict cannotn occur with PRS, even if the failed DP Master is still active on the PROFIBUS level.

Furthermore, many DP Master implementations on the market do not support the Flying Master principle. As both DP Masters are prevented from being connected to the bus at the same time, the device avoids all disadvantages of current redundancy concepts.

PRS provides the DP Master systems with important information about the redundancy operation, i.e. the alive state of the complementary system It also allows the execution of a switch-over command. The device can be used in very complex redundancy systems, i.e. in connection with PROFIBUS OPC servers or overlying Ethernet based cell networks. Furthermore, PRS can be controlled via both integrated Ethernet connections if direct control via the PROFIBUS is not
possible.

There is no single point of failure with PRS because if the device does develop a fault the Master to Slave communication would continue without interrupted.