WinCC OA with low band width and high latency period

The communication between the single managers takes place via a TCP/IP message interface. This guarantees a secure and high-performance transmission. The data transmission between the managers is event-oriented. Thereby values are only processed and transferred in case of changes. This provides highest efficiency and performance.

In a TCP/IP communication the messages between the sender and the recipient are confirmed. The sender waits for a message confirmation. If the sender does not receive a confirmation, the data is resent. The data is split into data packets and sent. The data packets are reassembled when receiving the data. The latency period is the time that a data packet needs when it is sent from point A to point B. Furthermore, the time contains the confirmation time.

Since the communica tion in WinCC OA is based on TCP/IP, it is connection-orientated and the messages between the managers must be confirmed.

The minimum band width in the network depends on the transferred amount of data.

A message to send a value for a data point element has a size of 160 bytes. The size for alerts amounts to 220 bytes.

Consider the band width separately for the Oracle database when using the RDB archiving, as well as for other features of third-party suppliers. The frequency with which the data is queried, plays a crucial role in a network and has a decisive effect on the band width requirements.

A nearly latency-free connection is required for redundant systems.

Accelerators can be used to optimize the latency period (the Oracle protocol is an exception).