Concept for HIQuad X System
Page 18 of 110 HI 803 211 E Rev. 1.01.00
During redundant operation, the signal is processed via both system buses A and B. The
system buses A and B between the I/O processing modules are implemented in a patch cable.
Figure 5 shows the example of an H51X redundancy system with system buses A and B. Up to
16 extension racks can be connected to the system buses in a UP loop, DOWN loop, or UP and
DOWN loop. The extension racks are interconnected with system buses A and B via the I/O
processing module, see F-IOP 01 manual (HI 803 219 E).
The advantage of a redundancy system is that, if one system bus is disconnected, the system
can continue to operate via the redundant system bus. If an I/O processing module fails, all
output modules in the affected rack enter the safety-related, de-energized state. The failsafe
default values are transmitted for the input modules.
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