Systems With Standard And Fault-Tolerant Communications; Standard Communication; Fault-Tolerant Communication - Siemens SIMATIC S7-400H Manual

A.2.3 Comparison of System Configurations With Standard and
Fault-Tolerant Communications
The following section gives you a comparison between standard and fault-tolerant
communication for a configuration consisting of a fault-tolerant system, a
fault-tolerant CPU in single operation and a single-channel OS.
By comparison, only the communication components CP and cable were taken into
account.

Systems with standard and fault-tolerant communications

Standard communication

Single-user OS

Fault-tolerant communication

Single-user OS
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07
Characteristic Values of Redundant Programmable Logic Controllers
S7-400H system
S7-400H system
S7-400 with
fault-tolerant
CPU
S7-400 with
fault-tolerant
CPU
Baseline
1
Factor
83
A-9