ABB ACS850 User Manual

Control through the embedded fieldbus interface 319
 Control Word and Status Word
The fieldbus Control Word (CW) is a 16-bit or 32-bit packed boolean word. It is the
principal means of controlling the drive from a fieldbus system. The CW is sent by the
fieldbus controller to the drive. The drive switches between its states according to the
bit-coded instructions of the CW. In the embedded fieldbus communication, the CW is
written to drive parameter 02.36 EFB main cw from where you can use it in the
control of the drive. The fieldbus CW is either written to the drive CW as it is, or the
data is converted. See section About the EFB communication profiles on page 321.
The fieldbus Status Word (SW) is a 16-bit or 32- bit packed boolean word. It contains
status information from the drive to the fieldbus controller. In the embedded fieldbus
communication, the SW is read from drive parameter 02.37 EFB main sw. The drive
SW is either written to the fieldbus SW as it is or the data is converted. See section
About the EFB communication profiles on page 321.
 References
Fieldbus references (REF1 and REF2) are 16-bit or 32-bit signed integers. The
contents of each reference word can be used as the speed, frequency, torque or
process reference. In the embedded fieldbus communication, the REF1 and REF2
are written to 02.38 EFB main ref1 and 02.39 EFB main ref2 from where you can use
them in the control of the drive. The references are either written to the drive
references as they are, or the values are scaled. See section About the EFB
communication profiles on page 321.
 Actual values
Fieldbus actual signals (ACT1 and ACT2) are 16-bit or 32-bit signed integers. They
convey selected drive parameter values from the drive to the master. The drive
values are either written to the fieldbus actual values as they are, or the values are
scaled. See section About the EFB communication profiles on page 321.
 Data inputs/outputs
Data input/output (I/O) are 16-bit or 32-bit words containing selected drive parameter
values. Parameters 58.35 Data I/O 1 … 58.58 Data I/O 24 define the addresses from
which the master either reads data (input) or to which it writes data (output).
 Register addressing
The address field of Modbus requests for accessing holding registers is 16 bits. This
allows the Modbus protocol to support addressing of 65536 holding registers.
Historically, Modbus master devices used 5-digit decimal addresses from 40001 to
49999 to represent holding register addresses. The 5-digit decimal addressing limited
to 9999 the number of holding registers that could be addressed.

ABB ACS850 Specifications

General

Safety	STO (Safe Torque Off)
Communication	CANopen
Enclosure	IP21
Output Voltage	Up to 1000 V DC
Protection Features	Overcurrent, Overvoltage, Undervoltage
Cooling Method	Air or liquid cooling
Input Voltage	380 to 690 V AC

Summary

About the manual

Compatibility

Compatibility with ACS850 standard control program version UIFI2200 and later.

Safety instructions

Follow all safety instructions delivered with the drive for installation, commission, or use.

Reader

Assumes knowledge of electrical wiring practices, components, and schematic symbols.

The ACS850 control panel

Features

Alphanumeric control panel with LCD, copy function, context-sensitive help, and real-time clock.

Installation

Covers mechanical and electrical installation procedures for the control panel.

Layout

Describes the physical layout and key functions of the ACS850 control panel.

Status line

Explains the basic status information displayed on the top line of the LCD.

Operating instructions

Guides on basic operation, menu navigation, and task execution using the control panel.

Control locations and operating modes

Local control vs. external control

Explains the two main control locations: external and local, selected via LOC/REM key or PC tool.

Operating modes of the drive

Describes the different control modes: speed control, torque control, and special control modes.

Program features

Drive configuration and programming

Details the two parts of the drive control program: firmware and application programs.

Control interfaces

Covers programmable analog and digital inputs/outputs, and I/O extensions.

Motor control

Discusses constant speeds, critical speeds, and speed controller tuning methods.

Application control

Details application macros and process PID control for advanced functions.

Safety and protections

Covers emergency stop and thermal motor protection features for safe operation.

Diagnostics

Includes signal supervision and maintenance counters for monitoring and service reminders.

Load analyzer

Tools for monitoring peak values and amplitude distribution of signals.

Backup and restore of drive contents

Allows backing up and restoring drive settings and configurations.

Application macros

General

Pre-defined parameter sets used as a basis for drive setup and customization.

Factory macro

Suited for straightforward speed control applications like conveyors and pumps.

Hand/Auto macro

For speed control applications with two external control devices.

PID control macro

Suitable for process control applications like pressure, level, or flow control.

Torque control macro

Used for applications requiring torque control of the motor.

Sequential control macro

For speed control applications with multiple constant speeds and ramps.

Parameters

Terms and abbreviations

Defines common terms and abbreviations used throughout the parameter descriptions.

Parameter listing

Comprehensive list of all drive parameters, their values, descriptions, and units.

Additional parameter data

Terms and abbreviations

Defines technical terms and abbreviations used in the manual.

Fieldbus equivalents

Explains scaling between panel values and integers used in serial communication.

Pointer parameter format in fieldbus communication

Details the format for value and bit pointer parameters transferred via fieldbus.

Fault tracing

Safety

Warning that only qualified electricians should maintain the drive.

How to reset

Instructions on how to reset the drive after a fault or alarm occurs.

Fault history

Stores information on the 16 latest faults, including time stamps.

Alarm messages generated by the drive

Lists alarm codes, causes, and recommended actions for troubleshooting.

Control through the embedded fieldbus interface

System overview

Explains connecting the drive to external control systems via a serial communication link.

Connecting the embedded fieldbus to the drive

Details connecting the fieldbus interface to the JCU control unit terminal XD2D.

Setting up the embedded fieldbus interface

Guides on configuring communication parameters for embedded fieldbus.

Setting the drive control parameters

Details drive control parameter adjustments for fieldbus control.

Basics of the embedded fieldbus interface

Explains cyclic and acyclic data transfer using communication profiles.

Control Word and Status Word

Defines the fieldbus Control Word (CW) and Status Word (SW) for drive control and status.

References

Explains fieldbus references (REF1, REF2) for speed, frequency, torque, or process.

Actual values

Describes fieldbus actual values (ACT1, ACT2) conveying selected drive parameter values.

Data inputs/outputs

Explains how drive parameters are accessed via Modbus registers.

Modbus register addresses for the ABB Drives classic profile

Shows Modbus register addresses for ABB Drives classic profile.

Modbus register addresses for the ABB Drives enhanced profile

Shows Modbus register addresses for ABB Drives enhanced profile.

DCU 16-bit profile

Details control/status words, references, and actual signals for the DCU 16-bit profile.

Modbus register addresses for the DCU 16-bit profile

Lists Modbus register addresses for the DCU 16-bit communication profile.

DCU 32-bit profile

Details control/status words and references for the DCU 32-bit profile.

Modbus register addresses for the DCU 32-bit profile

Lists Modbus register addresses for the DCU 32-bit profile.

Modbus function codes

Explains Modbus function codes supported by the embedded fieldbus interface.

Modbus exception codes

Lists Modbus exception codes for communication errors.

Control through a fieldbus adapter

System overview

Explains connecting the drive to external control systems via a fieldbus adapter module.

Setting up communication through a fieldbus adapter module

Guides on configuring parameters for fieldbus adapter communication.

Setting the drive control parameters

Details drive control parameter adjustments for fieldbus control.

Basics of the fieldbus adapter interface

Explains cyclic and acyclic data transfer using fieldbus adapter.

Control Word and Status Word

Defines FBA Control Word (CW) and Status Word (SW) for drive control.

Actual values

Describes fieldbus actual values (ACT) conveying selected drive parameter values.

FBA communication profile

Describes state machine models for FBA communication profiles.

Drive-to-drive link

General

Describes daisy-chained RS-485 communication with master/follower drives.

Wiring

Refers to the Hardware Manual for drive-to-drive link wiring instructions.

Datasets

Explains DDCS messages and dataset tables for data transfer.

Types of messaging

Covers point-to-point, standard multicast, broadcast, and chained multicast messaging.

Control chain and drive logic diagrams

Speed feedback

Illustrates the process of obtaining and conditioning speed feedback signals.

Speed reference modification and ramping

Shows how speed references are modified, scaled, and ramped.

Speed error handling

Details the logic for managing speed errors, including compensation and limits.

Torque reference modification, operating mode selection

Explains torque reference handling and selection of operating modes.

Process PID control

Illustrates the block diagram and operation of the process PID controller.

Drive logic 1

Presents a state machine diagram for the drive's overall logic.

Drive logic 2 (Fieldbus interface)

Shows logic diagrams for control via fieldbus interface.

Direct torque control

Illustrates the DTC control loop, including flux optimization and torque control.

Further information

Product and service inquiries

Contact local ABB representative for product inquiries, quoting type and serial number.

Product training

Information on ABB product training available on the www.abb.com/drives website.

Providing feedback on ABB Drives manuals

Welcome for comments on manuals via the feedback form on the ABB website.

Document library on the Internet

Access manuals and product documents in PDF format via the www.abb.com/drives website.