Siemens SIMATIC S7-400H System Manual page 318

Characteristic values of redundant automation systems
A.2 Comparison of MTBF for selected configurations
Redundant CPUs with redundant I/Os
Single-channel, one-sided I/O
Redundant I/O
Table A-1 MTBF factors of the redundant I/Os
Module
Digital input modules, distributed
DI 24xDC24V
DI 8xNAMUR [EEx ib]
DI16xDC24V, Alarm
Analog input modules, distributed
AI 6x13-bit
AI8x12-bit
Digital output modules, distributed
DO 10xDC24V/2A
DO8xDC24V/2A
DO32xDC24V/0.5A
318
MLFB
6ES7 326–1BK00–0AB0
6ES7 326–1RF00–0AB0
6ES7 321–7BH00–0AB0
6ES7 336–1HE00–0AB0
6ES7 331–7KF02–0AB0
6ES7 326–2BF00–0AB0
6ES7 322–1BF01–0AA0
6ES7 322–1BL00–0AA0
MTBF factor
1
MTBF factor
see table below
MTBF factor MTBF factor
CCF = 1 % CCF = 0.2 %
100 500
100 500
4 4
100 500
5 5
100 500
3 4
3 4
System Manual, 09/2007, A5E00267695-03
S7-400H