Link layer - Arc protection - Bay control and measurement - Motor protection - Transformer protection - 2 winding - Busbar differential protection (low impedance) - Feeder protection - Voltage regulation - Busbar protection (voltage and frequency) - Capacitor bank protection - Interconnection protection - Power management/Load shedding - Back-up protection - IEC 60870-5-101/104 Communication Manual - SSC600 Smart substation control and protection - 1.5 - IEC - ANSI - 16.02.2023

SSC600 and SSC600 SW IEC 60870-5-104 Communication Protocol Manual

(Network-specific parameter, mark all used options with an “X“. Specify the maximum frame length. If a non-standard assignment of class 2 messages is implemented for unbalanced transmission, indicate the Type ID and COT of all messages assigned to class 2.)

Frame format FT 1.2, single character 1 and the fixed time-out interval are used exclusively in this companion standard.

Link transmission procedure

Address field of the link

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Balanced transmission

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Not present (balanced transmission only)

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Unbalanced transmission

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One octet

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Two octets

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Structured

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Unstructured

Frame length

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Maximum length L (control direction)

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Maximum length L (monitor direction)

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Time during which repetitions are permitted (Trp) or number of repetitions

When using an unbalanced link layer, the following ASDU types are returned in class 2 messages (low priority) with the indicated causes of transmission:

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The standard assignment of ASDUs to class 2 messages is used as follows:

Type identification

Cause of transmission

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A special assignment of ASDUs to class 2 messages is used as follows:

Type identification

Cause of transmission