GE Multilin F650 - B.1 Introduction

GEK-106310-AF F650 DIGITAL BAY CONTROLLER B-1
F650 Digital Bay Controller
Appendix B: MODBUS protocol
GE
Grid Solutions
MODBUS PROTOCOL
B.1 Introduction
This section describes the MODBUS memory map and how to read and write data from and to the F650 relay using
MODBUS protocol. The MODBUS protocol is an industrial communications protocol based on a master/slave architecture
(RTU-Serial) or a client/server architecture (TCP/IP). Refer to http://www.modbus.org/ for more information about this
protocol.
A generic memory map has been created, compatible between versions, with all possible items that an F650 may have,
independent of type or configuration to prevent an existing integration from being affected by version changes. This
memory map describes each item including the data type, length, memory position, object version, etc. Moreover, the
memory map groups the different objects into subgroups, such as status and settings groups.
Each object has a unique memory position for the whole family. Only after reading the objects of a particular relay model,
it is possible to elaborate its own MODBUS memory map. This map is only valid for that particular relay and memory
version. From one version to another the memory positions of existing objects remain fixed, and new objects are assigned
new addresses, which again remain the same for following versions.
View the Memory Map using EnerVista 650 Setup software, menu:
View > MODBUS Memory map