S-Bus Driver

The WinCC OA S-Bus driver is used for the connection from SAIA PCD control devices to WinCC OA projects. The client mode of the SAIA S-Bus driver is used in WinCC OA together with the UDP protocol. The serial variant of the SAIA S-Bus driver is not supported.

Characteristics S-Bus

  • Ease of handling

  • Built into every PCD processor

  • Fail-safe data transfer due to using CRC-16 error detection

  • High transfer rate due to efficient binary protocol

  • Connection monitoring and retransmit function

Supported telegram types in WinCC OA

Following telegram types are supported in the WinCC OA S-Bus driver:

  • Read Flag

  • Write Flag

  • Read Register

  • Write Register

  • Read PCD Status

  • Write System Program Version

  • Read Text

  • Write Text

  • Input signals are only received on demand, i.e. "spontaneous" input mode is not supported.

  • To increase performance, when polling data is grouped together to obtain higher transfer rate (see also MaxGap). Commands are not grouped together.


Redundant systems are supported by the S-Bus driver. In this case both drivers (active and passive) access the PLC at the same time. Commands are only sent from the active server, while data can be read from both drivers. The requirement is that both drivers can access the PLC at the same time.

Redundant connection to a PLC or redundant PLCs are not supported.

Chapter Description
S-Bus, basics Basic information about the S-Bus driver in WinCC OA.
Requirements and Installation Information about requirements and installation of the S-Bus driver in WinCC OA.
Configuration of the S-Bus driver Information about the configuration of the S-Bus driver.
Defining the peripheral addresses of the S-Bus driver How to configure the peripheral addresses of the driver.
Possible Config Entries of the S-Bus driver List of possible Config entries for the S-Bus driver.
Details of the S-Bus driver Additional details of the S-Bus driver.