Eaton Cutler Hammer MN05001002E Installation Manual

Intelligent Technologies QCPort System Install ManualNovember 2005MN05001002E For more information visit www.eatonelectrical.com Page 10QCPort Operating ModesOverviewThe QCPort system is capable of two operating modes:• Master-Slave• PeerWhen the system is intended to be used in a master-slave setting there is noconfiguration necessary other then setting the address (group ID) of each device to aunique addressPeer devices require a configuration setting for normal operation. Devices that willcommunicate peer are the S811 soft start and the user display (DIM).Understanding Master-SlaveMaster-Slave is when a single device (master) is responsible for scheduling allcommunication to the remainder of the devices (slaves). In most cases, this will belimited to IO applications where a Network Adapter is controlling the IO and motor controldevices. A slave only communicates when it is communicated to; thus eliminatingcollisions. Since there are no unscheduled communications in a Master-Slave system,the scan time of a QCPort system will be deterministic.An example of a Master-Slave system can be found in Figure 3: Example of RemoteConnection Using QCPort.Understanding PeerPeer communication is when devices broadcast their messages on event transitions or atime base to a specific device or groups of devices. Unlike Master-Slave, this mode hasno master scheduler in the system, and all devices produce data on an internal scheduleor when an event occurs (e.g., input transition, fault). In this mode, there is collisiondetection to detect if a message is damaged by two devices talking at the same time. Ifthis occurs, then the devices both stand off (at different stand off times) for a period oftime and attempt to re-transmit the message.An example of a Peer-to-Peer system can be found in Figure 2: Example of MultiplePeripherals on One Device Using QCPort.