Hardware manual

Communication profiles

The PROFIdrive communication profile

The Control Word and the Status Word

The Control Word (PROFIBUS Parameter 967) is the principal means for controlling

the drive from a fieldbus system. It is sent by the fieldbus master station (PLC) to the

drive through the adapter module. The drive switches between its states according

to the bit-coded instructions on the Control Word, and returns status information to

the master in the Status Word (PROFIBUS Parameter 968).

The contents of the Control Word and the Status Word are detailed in the tables

below. The meaning of vendor-specific bits is defined by the drive application

program. The drive states are presented in The general PROFIBUS state machine

for all operating modes, page 30.

References and scaling

ABB drives can receive control information from multiple sources including analogue

and digital inputs, the drive control panel and a communication module (e.g. FPBA-

01). In order to have the drive controlled through PROFIBUS, the communication

module must be defined as the source for control information, e.g. Reference. See

pages from 14 to 17 for the drive parametrization.

References in speed control mode

In the speed control mode, references are 16-bit or 32-bit words containing a sign bit

and a 15-bit or 31-bit integer. A negative reference (indicating reversed direction of

rotation) is formed by calculating the two’s complement from the corresponding

positive reference. The 32-bit reference value consists of a 16-bit integer value and

a 16-bit fractional value.

A 16-bit speed reference (REF or NSOLL_A) in hexadecimal (0 … 4000h)

corresponds to 0 … 100% of maximum reference. The speed scaling is defined by

the drive parameter 19.01.

For example: to set the PROFIdrive communication profile scaling ratio 1:1. The

drive parameter 19.01 is set to 16384 (4000h).

A 32-bit speed reference (NSOLL_B) in hexadecimal (0 … 4000 0000h)

corresponds to 0 … 100% of maximum reference (as defined by the drive

parameter).

References in torque control mode

References are 16-bit words containing a sign bit and a 15-bit integer. A negative

reference (indicating reversed direction of rotation) is formed by calculating the two’s

complement from the corresponding positive reference.

A 16-bit torque reference in hexadecimal (0 … 4000h) corresponds to 0 … 100% of

maximum reference. The torque scaling is defined by the drive parameter 24.05.

Actual values and scaling

Actual values are 16-bit or 32-bit words containing information on the operation of

the drive. The parameters to be monitored are selected by a drive parameter. See