Section 1 - Introduction Introduction; Figure 1-1. Distribution Protection Unit Product Family - ABB TPU2000 Technical Manual

TPU2000/2000R Modbus/Modbus Plus/ Modbus TCP/IP Automation Guide
Section 1 - Introduction
With the introduction of a microprocessor based protective relay, today's relay protection engineer must be
familiar with topics outside of traditional relaying schemes. It is intended that the production of this manual will
enable the relay engineer to understand the principles of a microprocessor-based relay's inclusion in a substation
automation project.
Substation automation is heavily dependent upon integration of the appropriate components to allow reporting of
metering and event data. The foundation of a successful automation solution is thorough engineering of a
communication system. The Transmission Protection Unit (TPU) is the culmination of intensive design efforts and
relaying experience, which combine protective relaying and communication capabilities at an economical price.
Through the evolution of protective relays, it was decided that a special manual needed to serve today's power
automation specialist.
This manual is intended to give the reader an in-depth explanation of the communication interfaces available with
the Transmission Protection Unit. Successful integration of microprocessor based relays like the TPU depends
on not just understanding the bits and bytes of a particular protocol. It is the inherent understanding and
application of such esoteric topics as physical interfaces, real time control, manufacturer independent device
integration, throughput vs. speed of communication, ... which influences the success of an automation project.
In many cases the individual performing the SCADA integration is not a relay protection engineer. This manual
departs from the standard type of relay manual in that each data type is explained and each bit, byte and word
meaning is explained. Several application examples are given within each section. A description of each protocol
command is illustrated for the benefit of the user. Appendices are included detailing application notes, which
augment the text. An explanation of the product's physical interfaces and the connectivity required is explored in
depth. Explanations of register's uses to increase overall throughput are also explored. Throughput is always an
issue when the system is commissioned. Understanding ways to improve the system data update is explained.
Several steps are required to permit successful communication between devices:
1. Identification of the hardware components (Section 2)
2. Correct physical connection between devices (Section 3).
3. Correct device configuration of port protocol and operation parameters (Section 4).
4. Generation and interpretation of the protocol command strings (Section 5).
The following sections shall explore the following procedures in depth when establishing a communication
automation system, utilizing the TPU2000 and TPU2000R.
troubleshooting and commissioning of the Modbus/Modbus Plus Networks.
The TPU2000, and TPU2000R all have networking capabilities. Figure 1-1 shows the general look of the units as
viewed from the front.
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Figure 1-1. Distribution Protection Unit Product Family

An additional Section (Section 6) illustrates
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