This document is a manual for the MOVITRAC® 31 frequency inverter, which introduces the communication interfaces and parameter list. The document provides detailed information on the working mode of the communication interfaces, the connection and technical data of the RS-232 and RS-485 interfaces, and the system requirements for communicating with a PLC.
This document serves as a manual for the SEW MOVITRAC 31.. frequency inverter, specifically focusing on its communications capabilities. It describes the two independent serial interfaces (X4 and X20) available on inverters of sizes 1 to 4, detailing their connection to PCs, PLCs, and other automation units via RS-232 and RS-485 standards.
The text provides a comprehensive overview of the communications protocol used by the inverter, including message types such as ENQUIRY, DATA, SELECT, and ACK/NACK frames. It also lists various operator control and serial communication options, such as the FGB31 keypad and FFI 31 InterBus-S interface, along with a complete parameter list for configuration.
| Interface connectors | X4 and X20 |
|---|---|
| Interface independence | Two independent serial interfaces |
| Master-slave principle | Higher-level control acts as master |
| Data traffic type | Acyclic, acknowledged |
MOVITRAC 31.. frequency inverters of sizes 1 to 4 have two independent serial interfaces.
Connector X20 is used for option pcbs.
The last value sent will be the one which is effective.