Ontario Pipeline - Fall 2018 - 28

REPORT | AUTOMATION COMMITTEE

ISA112 Standards Committee
Developing New SCADA Standard

External Applications

J

Enterprise Network

I

DMZ / Process Information Network

H

F
E
D

Alarms

Historian

Applications

Databases
Drivers

Communication Servers

Backhaul networks

Level 4

Process Information Network
Control Network

Control Room network

HMI

Level 5*

Enterprise Network

Site n

G

External Network

Level 3

Level 2

Wide Area Network

Controller Network

C

Local Controllers

B

Field Sensor networks

A

Field Devices

Level 1

Level 0

Notes:
1
2
3
4
*

Letters are used avoid potential conflict with ISA-95 and other 'Layer" models.
Routers and Firewalls between layers are not shown.
Other system-specific servers, applications ,and workstations are not shown.
Remote-hosted external applications (Cloud) could be configured to attach to devices at any level, with appropriate firewalls, tunneling and routing.
We show a Purdue Level 5. The true Purdue Model only has levels 0-4 because it did not anticipate external applications.

Figure 1: ISA112 SCADA System Architecture Model (draft, as of June 25, 2018)
28 | O N T A R I O P I P E L I N E | FALL 2018

Revision June 22, 2018

Purdue Reference Model

K

with SCADA systems. The answers to these questions can vary considerably, depending on who
you talk to.
When working with a large water utility, internal SCADA standards are usually overseen by the
organization's PCS (process control systems) group.
Usually developed in-house, created by a consultant, or a combination of the two, it is a lot of work
to develop SCADA standards and keep them up to
date. In fact the work to keep a set of internal SCADA
standards current at a large utility is a never ending
task. For smaller utilities, dealing with SCADA standards is challenging due to limited staff resources,
limited budgets, and few publicly available SCADA
guidelines. In any utility, capital project work can
also be challenging SCADA-wise, especially when
a utility does not have a full set of SCADA internal

Supervisory Controllers

BY GRAHAM NASBY

hen designing, building, updating, or operating supervisory control and data acquisition (SCADA)
systems, the use of SCADA standards is an essential tool. It is through the use of
common SCADA standards that the inner working
parts of SCADA systems are able to function. For
example, inside a water facility, SCADA standards
are used to define how equipment/instrumentation is wired, what signals are named, how PLCs
are programmed, how servers are configured, how
data is logged, and how information is presented
to operators on view screens.
But where do SCADA standards come from?
And what defines a good set of SCADA standards?
Furthermore, how do I get a copy? These are all
good questions that come up when working



Ontario Pipeline - Fall 2018

Table of Contents for the Digital Edition of Ontario Pipeline - Fall 2018

The OWWA Report
The OMWA Report
The OWWEA Report
Ontario Provincial Standards are Made for Life in Ontario
QA/QC for the Operational Lab & Online Equipment
The Perils of Misreading and Misusing Standards
Control & Prevention of Disinfection By-product Formation
The Great Lakes Water Festival
Committee Reports
Certification Corner
OWWEA Member Listing
Index to Advertisers
Ontario Pipeline - Fall 2018 - Intro
Ontario Pipeline - Fall 2018 - bellyband1
Ontario Pipeline - Fall 2018 - bellyband2
Ontario Pipeline - Fall 2018 - cover1
Ontario Pipeline - Fall 2018 - cover2
Ontario Pipeline - Fall 2018 - 3
Ontario Pipeline - Fall 2018 - The OWWA Report
Ontario Pipeline - Fall 2018 - The OMWA Report
Ontario Pipeline - Fall 2018 - The OWWEA Report
Ontario Pipeline - Fall 2018 - 7
Ontario Pipeline - Fall 2018 - Ontario Provincial Standards are Made for Life in Ontario
Ontario Pipeline - Fall 2018 - 9
Ontario Pipeline - Fall 2018 - 10
Ontario Pipeline - Fall 2018 - 11
Ontario Pipeline - Fall 2018 - QA/QC for the Operational Lab & Online Equipment
Ontario Pipeline - Fall 2018 - 13
Ontario Pipeline - Fall 2018 - 14
Ontario Pipeline - Fall 2018 - The Perils of Misreading and Misusing Standards
Ontario Pipeline - Fall 2018 - 16
Ontario Pipeline - Fall 2018 - 17
Ontario Pipeline - Fall 2018 - Control & Prevention of Disinfection By-product Formation
Ontario Pipeline - Fall 2018 - 19
Ontario Pipeline - Fall 2018 - 20
Ontario Pipeline - Fall 2018 - 21
Ontario Pipeline - Fall 2018 - The Great Lakes Water Festival
Ontario Pipeline - Fall 2018 - 23
Ontario Pipeline - Fall 2018 - Committee Reports
Ontario Pipeline - Fall 2018 - 25
Ontario Pipeline - Fall 2018 - 26
Ontario Pipeline - Fall 2018 - 27
Ontario Pipeline - Fall 2018 - 28
Ontario Pipeline - Fall 2018 - 29
Ontario Pipeline - Fall 2018 - 30
Ontario Pipeline - Fall 2018 - 31
Ontario Pipeline - Fall 2018 - 32
Ontario Pipeline - Fall 2018 - Certification Corner
Ontario Pipeline - Fall 2018 - OWWEA Member Listing
Ontario Pipeline - Fall 2018 - 35
Ontario Pipeline - Fall 2018 - 36
Ontario Pipeline - Fall 2018 - 37
Ontario Pipeline - Fall 2018 - Index to Advertisers
Ontario Pipeline - Fall 2018 - cover3
Ontario Pipeline - Fall 2018 - cover4
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