NZQA registered unit standard
2662 version 6
Page 1 of 3
Title
Demonstrate knowledge of distributed control systems
Level
4
Credits
2
Purpose
People credited with this unit standard are able to demonstrate
knowledge of:
 distributed control systems; and
 signal transmission used in distributed control systems.
Classification
Industrial Measurement and Control > Industrial Measurement
and Control - Theory
Available grade
Achieved
Outcomes and evidence requirements
Outcome 1
Demonstrate knowledge of distributed control systems.
Evidence requirements
1.1
Describe limitations of panel mounted discrete controllers.
Range
1.2
Describe advantages of distributed control systems.
Range
1.3
loop, star, serial, multidrop, nodes, gateways.
Describe and compare cable types for connections.
Range
1.5
flexibility, reduced cabling, multiple operator workstations, reduced
hardware, data highway.
Describe and compare distributed control system interconnection methods.
Range
1.4
lack of flexibility, wiring, panel space.
twin axial, coaxial, fibre optic, unshielded twisted pair (UTP).
Describe, with the aid of diagrams, simple distributed control systems.
Range
ring nodes, supervisory computer, distributed controllers,
engineering workstation, personal computer.
Outcome 2
The Skills Organisation
SSB Code 100401
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
2662 version 6
Page 2 of 3
Demonstrate knowledge of signal transmission used in distributed control systems.
Evidence requirements
2.1
Explain digital data transmission terminology.
Range
2.2
parity, baud rate, software, hardware.
Describe and compare data transmission methods.
Range
2.3
serial RS232, serial RS422, serial RS485, parallel, synchronous,
asynchronous, Universal Serial Bus (USB).
Describe and compare distributed control system data transmission protocols.
Range
carrier sense multiple access/collision detection (CSMA/CD),
token passing.
2.4
Describe the differences between transmission control protocol (TCP) and
TCP/internet protocol (IP).
2.5
Describe and compare data control systems (DCS) and a programmable logic
controller (PLC).
2.6
Describe applications for each PLC and DCS and explain the integration
between the two.
Planned review date
31 December 2017
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
31 October 1995
31 December 2013
Revision
2
30 October 1997
31 December 2013
Revision
3
3 April 2001
31 December 2013
Review
4
22 June 2001
31 December 2013
Review
5
19 May 2008
31 December 2019
Review
6
28 November 2013
N/A
Consent and Moderation Requirements (CMR) reference
0003
This CMR can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Please note
Providers must be granted consent to assess against standards (accredited) by NZQA,
before they can report credits from assessment against unit standards or deliver courses
of study leading to that assessment.
The Skills Organisation
SSB Code 100401
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
2662 version 6
Page 3 of 3
Industry Training Organisations must be granted consent to assess against standards by
NZQA before they can register credits from assessment against unit standards.
Providers and Industry Training Organisations, which have been granted consent and
which are assessing against unit standards must engage with the moderation system that
applies to those standards.
Requirements for consent to assess and an outline of the moderation system that applies
to this standard are outlined in the Consent and Moderation Requirements (CMR). The
CMR also includes useful information about special requirements for organisations wishing
to develop education and training programmes, such as minimum qualifications for tutors
and assessors, and special resource requirements.
Comments on this unit standard
Please contact The Skills Organisation reviewcomments@skills.org.nz if you wish to
suggest changes to the content of this unit standard.
The Skills Organisation
SSB Code 100401
 New Zealand Qualifications Authority 2016