Opc Server - Siemens SIMATIC S7-400H Manual

Communication Functions

OPC Server

If several HMI devices OPC are connected to the H system for visualization, then
keep the number of the OPC servers accessing the H system low. The OPC
clients should access a common OPC server, which then reads the data from the
H system.
You can optimize data exchange by using WinCC and its client/server concept.
Some HMI devices of other manufacturers support the S7 communication protocol,
use this option.
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Automation System S7-400H Fault-tolerant Systems
A5E00068197-07