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Center Communications Protocol or ICCP in the United States). IEC 60870-6-503: TASE.2 Services and Protocol. ABB Systems Control.
IEC 60870 part 5[1] is one of the IEC 60870 set of standards which define systems used for telecontrol (supervisory control and data acquisition) in electrical engineering and power system automation applications. Part 5 provides a communication profile for sending basic telecontrol messages between two systems, which uses permanent directly connected data circuits between the systems. The IEC Technical Committee 57 (Working Group 03) have developed a protocol standard for telecontrol, teleprotection, and associated telecommunications for electric power systems. The result of this work is IEC 60870-5. Five documents specify the base IEC 60870-5:
- IEC 60870-5-1 Transmission Frame Formats
- IEC 60870-5-2 Data Link Transmission Services
- IEC 60870-5-3 General Structure of Application Data
- IEC 60870-5-4 Definition and Coding of Information Elements
- IEC 60870-5-5 Basic Application Functions
- IEC 60870-5-6 Guidelines for conformance testing for the IEC 60870-5 companion standards
- IEC TS 60870-5-7 Security extensions to IEC 60870-5-101 and IEC 60870-5-104 protocols (applying IEC 62351)
The IEC Technical Committee 57 has also generated companion standards:
- IEC 60870-5-101 Transmission Protocols - companion standards especially for basic telecontrol tasks
- IEC 60870-5-102 Transmission Protocols - Companion standard for the transmission of integrated totals in electric power systems (this standard is not widely used)
- IEC 60870-5-103 Transmission Protocols - Companion standard for the informative interface of protection equipment
- IEC 60870-5-104 Transmission Protocols - Network access for IEC 60870-5-101 using standard transport profiles
- IEC TS 60870-5-601 Transmission protocols - Conformance test cases for the IEC 60870-5-101 companion standard
- IEC TS 60870-5-604 Conformance test cases for the IEC 60870-5-104 companion standard
IEC 60870-5-101/102/103/104 are companion standards generated for basic telecontrol tasks, transmission of integrated totals, data exchange from protection equipment & network access of IEC101 respectively.
- 1IEC 60870-5-101
- 2IEC 60870-5-103
IEC 60870-5-101[edit]
IEC 60870-5-101 [IEC101] is a standard for power system monitoring, control & associated communications for telecontrol, teleprotection, and associated telecommunications for electric power systems. This is completely compatible with IEC 60870-5-1 to IEC 60870-5-5 standards and uses standard asynchronous serial tele-control channel interface between DTE and DCE. The standard is suitable for multiple configurations like point-to-point, star, mutidropped etc.
![Abb iccp protocol 2017 Abb iccp protocol 2017](https://docplayer.net/docs-images/40/732986/images/page_2.jpg)
Features[edit]
- Supports unbalanced (only master initiated message) & balanced (can be master/slave initiated) modes of data transfer.
- Link address and ASDU (Application Service Data Unit) addresses are provided for classifying the end station and different segments under the same.
- Data is classified into different information objects and each information object is provided with a specific address.
- Facility to classify the data into high priority (class-1) and low priority (class-2) and transfer the same using separate mechanisms.
- Possibility of classifying the data into different groups (1-16) to get the data according to the group by issuing specific group interrogation commands from the master & obtaining data under all the groups by issuing a general interrogation.
- Cyclic & Spontaneous data updating schemes are provided.
- Facility for time synchronization
- Schemes for transfer of files-Example:IED's will store disturbance recorder file in the memory, When electrical disturbance is occurred in the field. This file can be retrieved through IEC103 protocol for fault analysis
Frame format[edit]
Character format of IEC 101 uses 1 start bit, 1 stop bit, 1 parity bit & 8 data bits. FT1.2 (defined in IEC 60870-5-1) is used for frame format of IEC 101 which is suitable for asynchronous communication with hamming distance of 4. This uses 3 types of frame formats -Frame with variable length ASDU, Frame with fixed length & single character. Single character is used for acknowledgments, fixed length frames are used for commands & variable lengths are used for sending data. The details of variable length frame is given below
Data unit | Name | Function |
---|---|---|
Start Frame | Start Character | Indicates start of Frame |
Length Field (*2) | Total length of Frame | |
Start Character (repeat) | Repeat provided for reliability | |
Control Field | Indicates control functions like message direction | |
Link Address (0,1 or 2) | Normally used as the device / station address | |
Data Unit Identifier | Type Identifier | Defines the data type which contains specific format of information objects |
Variable Structure Qualifier | Indicates whether type contains multiple information objects or not | |
COT (1 or 2) | Indicates causes of data transmissions like spontaneous or cyclic | |
ASDU Address (1 or 2) | Denotes separate segments and its address inside a device | |
Information Object | Information Object Address (1 or 2 or 3) | Provides address of the information object element |
Information Elements (n) | Contains details of the information element depending on the type | |
Information Object-2 | ----- | |
----- | ----- | |
Information Object-m | ||
Stop Frame | Checksum | Used for Error checks |
Stop Char | Indicates end of a frame |
Types supported[edit]
- Single indication without / with 24 / with 56 bit timestamps.
- Double indication without / with 24 / with 56 bit timestamps.
- Step position information without / with 24 / with 56 bit timestamps.
- Measured value – normalized, scaled, short floating point without / with timestamps.
- Bitstring of 32 bit without / with timestamps.
- Integrated totals (counters) without / with timestamps.
- Packed events (start & tripping ) of protection equipments
- Single commands
- Double commands
- Regulating step command
- Set point commands of various data formats
- Bitstring commands
- Interrogation commands
- Clock synchronization & delay acquisition commands
- Test & reset commands
--
IEC 60870-5-103[edit]
IEC 60870-5-103 [IEC103] is a standard for power system control and associated communications. It defines a companion standard that enables interoperability between protection equipment and devices of a control system in a substation. The device complying with this standard can send the information using two methods for data transfer - either using the explicitly specified application service data units (ASDU) or using generic services for transmission of all the possible information. The standard supports some specific protection functions and provides the vendor a facility to incorporate its own protective functions on private data ranges.
Frame format[edit]
IEC 103 uses FT1.2 (defined in IEC 60870-5-1) for frame format having options of Frame with variable length, Frame with fixed length & single character similar to IEC 101. Single character is used for acknowledgments, fixed length frames are used for commands & variable lengths are used for sending data. However the frame format of IEC 103 differs from IEC 101 in information object address which is split into function type (ftype) and information number (inumber) in IEC 103. Also IEC 103 can have only single information object in a frame whereas IEC 101 can have multiple information objects. Many of the field sizes are also restricted in IEC 103. The details of variable length frame is given below
Data unit | Name | Function |
---|---|---|
Start Frame | Start Character | Indicates start of Frame |
Length Field (*2) | Total length of Frame | |
Start Character (repeat) | Repeat provided for reliability | |
Control Field | Indicates control functions like message direction | |
Link Address (1 or 2) | Normally used as the device / station address | |
Data Unit Identifier | Type Identifier | Defines the data type which contains specific format of information objects |
Variable Structure Qualifier | Indicates whether type contains multiple information objects or not | |
COT | Indicates causes of data transmissions like spontaneous or cyclic | |
ASDU Address | Denotes separate segments and its address inside a device | |
Information Object | Function Type | Provides function type of the protection equipment used |
Information Number | Defines the information number within a given function type | |
Information Elements (n) | Contains details of the information element depending on the type | |
Stop Frame | Checksum | Used for Error checks |
Stop Char | Indicates end of a frame |
Supported Types[edit]
![Abb Iccp Protocol Abb Iccp Protocol](/uploads/1/2/5/1/125132922/983197374.jpg)
- Type 1 — Time-tagged message
- Type 2 — Time-tagged message with relative time
- Type 3 — Measurands I
- Type 4 — Time-tagged measurands with relative time
- Type 5 — Identification
- Type 6 — Time synchronization
- Type 7 — Start of General interrogation
- Type 8 —- General interrogation termination
- Type 9 — Measurands II
- Type 10 — Generic data
- Type 11 — Generic identification
- Type 23–31 — Used for transferring disturbance files
IEC 60870-5-104[edit]
IEC 60870-5-104 (IEC 104) protocol is an extension of IEC 101 protocol with the changes in transport, network, link & physical layer services to suit the complete network access. The standard uses an open TCP/IP interface to network to have connectivity to the LAN (Local Area Network) and routers with different facility (ISDN, X.25, Frame relay etc.) can be used to connect to the WAN (Wide Area Network). Application layer of IEC 104 is preserved same as that of IEC 101 with some of the data types and facilities not used. There are two separate link layers defined in the standard, which is suitable for data transfer over Ethernet & serial line (PPP - Point-to-Point Protocol). The control field data of IEC104 contains various types of mechanisms for effective handling of network data synchronization.
The security of IEC 104, by design has been proven to be problematic,[2] as many of the other SCADA protocols developed around the same time. Though the IEC technical committee (TC) 57 have published a security standard IEC 62351, which implements end-to-end encryption which would prevent such attacks as replay, man-in-the-middle and packet injection. Unfortunately due to the increase in complexity vendors are reluctant to roll this out on their networks.
References[edit]
- ^Gordon R. Clarke et al, Practical modern SCADA protocols: DNP3, 60870.5 and related systems, Newnes, 2004 ISBN0-7506-5799-5
- ^Maynard, Peter; McLaughlin, Kieran; Haberler, Berthold (11 September 2014). 'Towards Understanding Man-In-The-Middle Attacks on IEC 60870-5-104 SCADA Networks'. 2nd International Symposium for ICS & SCADA Cyber Security Research 2014: 30–42. doi:10.14236/ewic/ics-csr2014.5. Retrieved 30 June 2015.
External links[edit]
- Eclipse NeoSCADA™, IEC 60870-5-104 client and server Java implementation in Eclipse NeoSCADA™, EPL-licensed
- j60870, IEC 60870-5-104 client and server Java library at openmuc.org, GPL-licensed
- part5 IEC 60870-5-101 & IEC 60870-5-104 client and server Go implementation, public domain
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