HIMA HIQuad H41X, System Manual

Page: 21 / 110

System Concept for HIQuad X
HI 803 211 E Rev. 1.01.00 Page 21 of 110
3.3.1 The H41X Mono System
Thanks to the use of safety-related modules (I/O modules, the I/O processing module and a
processor module), the HIQuad H41X system can ensure safety-related signal processing in
accordance with SIL 3 already when operating in a mono structure, see Figure 7.
Figure 7: Example of Safe H41X Mono Operation (1oo2)
The input modules of the HIQuad H41X system safely record the values measured by sensors.
Data is exchanged with the processor module via the I/O processing module. The measured
values are cyclically queried by the processor module and processed by the user program. The
user program's results are sent to the I/O processing module, which writes them to the output
modules. The output modules thus control the field level, e.g., the actuators.
During mono operation, the signal is forwarded by the processor module in slot 16 via system
bus A.
Figure 8 shows the example of an H41X mono system with system bus A. An additional
extension rack can be connected to the system bus A. The extension rack is connected to the
H41X base rack via the I/O processing module and the system bus A, see F-IOP 01 manual
(HI 803 219 E).
If the system bus connection is interrupted in a mono system, all I/O modules located after the
interruption point are no longer available. After the interruption point, all output modules enter
the safety-related, de-energized state. As for the input modules, the failsafe initial values are
processed in the respective processor module.