Concept of the HIMA PES
3
2 Concept of the HIMA PES
The HIMA PES of the H41q and H51q system families consist of 19 inches subracks for central
devices 5 HU and modules for binary and analog input/output signals which are assembled in
H51q systems within 19 inches subracks, 4 HU.
The HIMA PES use PCs (PADTs) with the tool ELOP II for programming, configuration, mon-
itoring, operation and documentation. The entry of the user program and the compilation into
the machine code is made only on the PC without connected PES. To load, test and to monitor
the PES the PC is connected via a serial interface RS 485 or a bus system to the PES.
2.1 Safety and Availability
HIMA PES are designed both for safety-related applications up to SIL 3 (definition according
to IEC 61508) and for high availability. Depending on the required safety and availability, HIMA
PES can be supplied as one-channel or two-channel (redundant) devices with the same mod-
ules in the central device as well as in the input/output level. Redundant modules increase the
availability, as in case of an error in a safety-related module this is automatically switched off
while the redundant module continues the operation.
The following table gives an overview:
1)
Individual I/O modules can also be used as redundant modules or connected to sensors in
a 2-out-of-3 voting to increase the availability.
The inputs have to be therefore configured on 3 different I/O modules.
Mono = single channel system structure
Redundant = redundant central modules and/or separated I/O bus system structure
Safety SIL 3 SIL 3 SIL 3
Availability normal (MS) high (HS) very high (HRS)
Central module mono redundant redundant
I/O modules
mono
1)
mono
1)
redundant
I/O bus mono mono redundant
Table 1: Safety and Availability
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