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SEAB 1W

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The SEAB 1W protocol (also referred to as Modnet 1W) developed by AEG is primarily based on the widely known IEC 870-5 standard (see also IEC 60870-5-101) using the FT1.2 format class for the link layer. It supports unbalanced data transmission (master/slave principle) and enables the coupling of several substations to a single line.

Only a small part of the full range of functions supplied by the IEC was implemented, and previously varying parameters, such as the number of address bytes, have now been clearly specified for the first time. Minor changes were made, for instance in the way time stamps are encoded.

ISO/OSI Model

7 Application Layer Seab1N Application Layer
6 Presentation Layer n/a
5 Session Layer n/a
4 Transport Layer n/a
3 Network Layer n/a
2 Link Layer FT 1.2 as specified in IEC 60870-5-1
1 Physical Layer RS232 / V.24 (UART-Conform)

Supported Information Types

Control Direction Single Command
Setpoint [16 bit]
Monitoring Direction Single indication [1 Bit]
Single indication [1 Bit] with time tag
Measured value [8 bit]
Measured value [11 bit]
Counter value [16 bit]

Protocol Features

Physical Layer RS232 / V.24 (UART-Conform), Half-Duplex
Link Layer Unbalanced transmission: Party Line or Point to Point connections
Application Layer Transmission of pulse commands
Transmission of setpoints
Spontaneous transmission of indications with or without time tag, measurands, counters, ...
Requested transmission of indications, measurands, counters, ...
General Interrogation
User defined services
Address Space Physical address: 0..255
Logical adddress: 1..65535
Information object address: 1..65535

Applicable Products

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ipConvLiteipConvLiteinexpensive protocol converter for standardized application
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ipConvPBSipConvPBSUniversal protocol converter with integrated PROFIBUS-DP, slave interface
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ipConvPBMipConvPBMUniversal protocol converter with integrated PROFIBUS-DP, master interface
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ipConvPNMipConvPNMUniversal protocol converter with integrated PROFINET-IO, master interface
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ipConvPNSipConvPNSUniversal protocol converter with integrated PROFINET-IO, slave interface
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