ABB NMBA-01 - Terms Used in this Guide

Chapter 1 – Introduction to This Guide
1-2 NMBA-01 Installation and Start-up Guide
Appendix A – Technical Data contains the technical information on
the Modbus module.
Appendix B – Modbus Protocol describes the Modbus protocol.
Appendix C – Ambient Conditions contains a specification of the
ambient conditions allowed during the transportation, storing and use
of the Modbus module.
Terms Used in This
Guide
Parameter A parameter is an operating instruction for the drive. Parameters can
be read and programmed with the drive control panel, or through the
NMBA-01 Module.
Communication Module Communication Module is a parameter name/parameter selection
name for a device (e.g. a fieldbus adapter) through which the drive is
connected to an external serial communication network (e.g. a
fieldbus). The communication with the communication module is
activated with a drive parameter.
NMBA-01 Modbus
Adapter Module
The NMBA-01 Adapter Module is one of the optional fieldbus adapter
modules available for ABB drives. The NMBA-01 is a device through
which an ABB drive is connected to a Modbus serial communication
bus.
Data Sets and
Data Words
Data sets are clusters of data sent through the DDCS link between the
NMBA-01 Adapter Module and the drive. Each data set consists of
three 16-bit words, i.e. data words. The Control Word (sometimes
called the Command Word) and the Status Word, References and
Actual Values (see Chapter 6) are types of data words; the contents of
some data words are user-definable.
Broadcast Write Modbus network allows the Modbus master to perform a write to every
slave station at the same time. This write is called Broadcast. This ser-
vice does not give verification back to the master that the value has
been received by each one of the slaves properly.
4XXXX Register Area Modicon PLCs have a signed integer data table area, which is used for
Analogue Output modules and for storing temporary or set-point val-
ues. These registers are in the address area starting from 40001. The
last register address available on PLCs depends on the available mem-
ory, but is less than 49999. The drive simulates this area by providing a
read and write access to its parameters through this register address
area.
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