IED IEDIEDSubstation LANIEC05000715-4-en.vsdRemotemonitoringUtility LANWANIEC05000715 V4 EN-USFigure 161: SPA communication structure for a remote monitoring system via asubstation LAN, WAN and utility LANSPA communication is mainly used for the Station Monitoring System. It caninclude different IEDs with remote communication possibilities. Connection to aPC can be made directly (if the PC is located in the substation), via a telephonemodem through a telephone network with ITU (former CCITT) characteristics orvia a LAN/WAN connection.glass <1000 m according to optical budgetplastic <25 m (inside cubicle) according to optical budgetFunctionality SEMOD115767-25 v3The SPA protocol V2.5 is an ASCII-based protocol for serial communication. Thecommunication is based on a master-slave principle, where the IED is a slave andthe PC is the master. Only one master can be applied on each fiber optic loop. Aprogram is required in the master computer for interpretation of the SPA-bus codesand for translation of the data that should be sent to the IED.For the specification of the SPA protocol V2.5, refer to SPA-bus CommunicationProtocol V2.5.18.5.2 Setting guidelines M11876-3 v7SPA, IEC 60870-5-103 and DNP3 use the same rear communication port. This portcan be set for SPA use on the local HMI under Main menu /Configuration /Communication /Station communication/Port configuration/SLM opticalserial port/PROTOCOL:1. When the communication protocol is selected, theIED is automatically restarted, and the port then operates as a SPA port.The SPA communication setting parameters are set on the local HMI under Mainmenu/Configuration/Communication/Station communication/SPA/SPA:1.Section 18 1MRK 505 393-UEN BStation communication382 Line differential protection RED650 2.2 IECApplication manual
