ABB INNPM12 Control Network, Cnet

The local interface supports hardware redundancy. Redundancy requires a full set of duplicate  modules (four INNIS01 modules and two INIIT03 modules). The secondary INIIT03 module continuously monitors the primary over dedicated Controlway. A failover occurs when the secondary  detects a primary module failure. When this happens, the secondary assumes responsibility and  the primary is taken offline.

Cnet-to-HCU Communication Interface

The Harmony control unit interface consists of the INNIS01 Network Interface Module and the  INNPM12 or INNPM11 Network Processing Module (Fig. 4). This interface can be used for a node  on the central network or on a satellite network (Fig. 1). Through this interface the Harmony control unit has access to Cnet and to Controlway at the same time. Controlway is an internal cabinet  communication bus between Harmony rack controllers and the communication interface  modules.

The HCU interface supports hardware redundancy. Redundancy requires a full set of duplicate  modules (two INNIS01 modules and two INNPM12 or INNPM11 modules). The secondary network processing module (INNPM12 or INNPM11) continuously monitors the primary through a  direct ribbon cable connection. A failover occurs when the secondary detects a primary module  failure. When this happens, the secondary assumes responsibility and the primary is taken offline.