6.1 Fast introductionThe CPU has a PROFIBUS/PtP interface with a fix pinout. After an overall reset the inter-face is deactivated. By appropriate configuration the PtP function (point to point) can beenabled:n PtP functionality– Using the PtP functionality the RS485 interface is allowed to connect via serialpoint-to-point connection to different source res. target systems.– The activation of the PtP functionality happens by embedding theSPEEDBUS.GSD from VIPA in the hardware catalog. After the installation theCPU may be configured in a PROFIBUS master system and here the interfacemay be switched to PtP communication.The protocols res. procedures ASCII, STX/ETX, 3964R, USS and Modbus are supported.The parametrization of the serial interface happens during runtime using the FC/SFC 216(SER_CFG). For this you have to store the parameters in a DB for all protocols exceptASCII.The FCs/SFCs are controlling the communication. Send takes place via FC/SFC 217(SER_SND) and receive via FC/SFC 218 (SER_RCV). The repeated call of the FC/SFC217 SER_SND delivers a return value for 3964R, USS and Modbus via RetVal that con-tains, among other things, recent information about the acknowledgement of the partnerstation. The protocols USS and Modbus allow to evaluate the receipt telegram by callingthe FC/SFC 218 SER_RCV after SER_SND. The FCs/SFCs are included in the consign-ment of the CPU.The following FCs/SFCs are used for the serial communication:FC/SFC DescriptionFC/SFC 216 SER_CFG RS485 parameterizeFC/SFC 217 SER_SND RS485 sendFC/SFC 218 SER_RCV RS485 receiveMore information about the usage of these blocks may be found in themanual "SPEED7 Operation List" from VIPA.GeneralProtocolsParametrizationCommunicationOverview FCs/SFCs forserial communicationVIPA System 300S+ Deployment PtP communicationFast introductionHB140 | CPU | 317-4PN23 | en | 18-01 85
