Emerson Process Management Bristol ControlWave PAC - Manual (Page 3)

October 2012
CWPAC
www.EmersonProcess.com/Remote 3
Multi-User Security Access
The ControlWave PAC employs a user name/password
access system protected by a 56-bit encryption technique
through the TCP connection. There can be up to 240 users
who sign in with their user name and password. Both the
user name and the password can be up to sixteen characters
in length.
You can customize the security level for each user based on
64 access rights including the ability to read and write data
values and files via FTP, access and configure historical and
audit data information, edit configuration, run internal
diagnostics, and read and reset system status.
Data Reliability
The ControlWave PAC is designed to provide the optimum
level of data reliability using a distributed database
architecture. All data, including time stamped alarms, alarm
limits, and historical data is stored locally in non-volatile
flash memory in each ControlWave PAC.
When historical data is collected from the ControlWave
PAC, it is converted and appended to a .CSV and ODBC
compliant database. The original historical data is not
changed and is stored in the device flash memory.
Historical Data Collection
The ControlWave Historical Data Collection system provides
time-stamped historical data storage in ControlWave flash
memory. The historical data is collected through OpenBSI
software on a scheduled or on-demand basis. After the data
is collected, it is converted to CSV and ODBC compliant file
formats for use in spreadsheets and reports. If any data is
missed due to a communication failure, it is collected and
the PC historical database is backfilled when the
communication is reestablished. This distributed historical
database architecture provides data reliability and integrity
during communication or PC failure.
Another important historical feature is the audit system. The
audit logs are files stored in ControlWave flash memory that
contain significant events and time-stamped alarms. In
addition to the real-time alarm reporting system, the alarms
stored in the audit alarm log provide a reportable historical
alarm archive.
These files are collected through OpenBSI software and
presented as text files in the PC. This functionality is
extremely useful in providing an event trail during
communication interruption, PC downtime, or other system
problem.
OpenBSI
Emerson’s OpenBSI (Open Bristol System Interface) is an
optional set of network setup, communication, diagnostic,
and data viewing software utilities for use with ControlWave
RTUs, flow computers, and controllers. At the core of
OpenBSI is the communication interface. The interface is
written as a Windows communication server API through
which other client applications communicate. OpenBSI
supports both serial BSAP protocol and Ethernet IP
communication to ControlWave devices.
ControlWave Designer
ControlWave Designer is an optional, fully IEC 61131-3
compliant programming environment for the ControlWave
PAC. ControlWave Designer includes all five IEC 61131-3
process languages for batch, continuous, and discrete
control. These languages are: Function Block Diagram,
Structured Text, Sequential Function Chart, Ladder Logic
Diagram, and Instruction List.
ControlWave Designer includes an extensive library of more
than 200 basic IEC 61131-3 functions and function blocks
common to many IEC 61131-3 based products. These
include:

Flip-flops, counters, and timers
 Ladder diagram functions – coils and contacts, etc.
 Numerical, arithmetic, and Boolean functions – Sine,
Cosine, Add, Sub, Square Root, And, Or, etc.
 Selection and comparison – Min, Max, Greater Than,
Equal, Less Than, etc.
 Type conversions – Integer to Real, Boolean to Word,
etc.
ACCOL III
In addition to the basic functions and function blocks,
ControlWave Designer brings the benefit of over twenty
years of SCADA and plant control experience in Emerson’s
ACCOL III function block library. ACCOL III includes over sixty
function blocks valuable for use in oil and gas, water and
waste, and process measurement and control applications.
ACCOL III is designed to take full advantage of the significant
features offered by ControlWave.
The library consists of many function blocks including:

Average, Compare, Totalize
 Scheduling and Sequencing
 PID and Lead/Lag
 AGA Gas Flow and Liquids Calculations
 File Handling
ObjectServer
ObjectServer is an optional OPC-compliant server that
provides direct communication to the ControlWave family
of controllers, RTUs, PLCs, and flow computers through the
OpenBSI Communications Interface. ObjectServer supports
serial multi-drop, remote telemetry, and Ethernet
communication networks. Unlike traditional OPC servers,
ObjectServer provides reliable access to RTUs that are
connected via low-bandwidth, high-latency, and poor-
quality networks such as radio, satellite, and cellular
modems.