ABB REO 517 Applications Manual page 404





394
Serial communiction, IEC
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The IEC 60870-5-103 communication protocol is mainly used when a protection termi-
nal communicates with a third party control or monitoring system. This system must
have a software that can interpret the IEC 60870-5-103 communication messages.
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The IEC 60870-5-103 is an unbalanced (master-slave) protocol for coded-bit serial
communication exchanging information with a control system. In IEC terminology a
primary station is a master and a secondary station is a slave. The communication is
based on a point to point principle. The master must have a software that can interpret
the IEC 60870-5-103 communication messages. For detailed information about IEC
60870-5-103, refer to the IEC60870 standard part 5: Transmission protocols, and to the
section 103: Companion standard for the informative interface of protection equipment.
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The protocol implementation in REx 5xx consists of the following functions:
• Event handling
• Report of analog service values (measurands)
• Fault location
• Command handling
- Autorecloser ON/OFF
- Teleprotection ON/OFF
- Protection ON/OFF
- LED reset
- Characteristics 1 - 4 (Setting groups)
• File transfer (disturbance files)
• Time synchronization
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When communicating locally with a Personal Computer (PC) or a Remote Terminal
Unit (RTU) in the station, using the SPA/IEC port, the only hardware needed is:
• Optical fibres, glass/plastic
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