Redundant Cpus With Redundant I/O; Single–Channel, One–Way I/O; Single–Channel Switch I/O - Siemens SIMATIC S7-400H Manual

Redundant CPUs with redundant I/O

Single–channel, one–way I/O
2 fiber-optic cables
ET 200M
Single–channel switch I/O
2 fiber-optic cables
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07
Characteristic Values of Redundant Programmable Logic Controllers
ET 200M
Active
backplane bus
MTBF factor
65
MTBF factor
70
A-7