ACS550-02/U2 User’s Manual 219Embedded fieldbusEmbedded fieldbusOverviewThe ACS550 can be set up to accept control from an external system using standardserial communication protocols. When using serial communication, the ACS550 caneither:• receive all of its control information from the fieldbus, or• be controlled from some combination of fieldbus control and other availablecontrol locations, such as digital or analog inputs and the control panel.Two basic serial communications configurations are available:• embedded fieldbus (EFB) – Using the RS485 interface at terminals X1:28…32 onthe control board, a control system can communicate with the drive using theModbus® protocol. (For protocol and profile descriptions, see sections Modbusprotocol technical data and ABB control profiles technical data later in thischapter.)• fieldbus adapter (FBA) – See chapter Fieldbus adapter on page 251.Control interfaceIn general, the basic control interface between Modbus and the drive consists of:• Output words– Control Word– Reference1– Reference2• Input words– StatusWord– Actual value 1– Actual value 2FieldbusFieldbus controllerOther devicesConnect using either:• standard embedded fieldbus (EFB) atterminals X1:28…32• fieldbus adapter (FBA) module mountedin slot 2 (option Rxxx).Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com
