HIMA F3349

Electrostatic discharge can damage the electronic components within the controllers! 

ƒWhen performing the work, make sure that the workspace is free of static, and 

wear an ESD wrist strap. 

ƒIf not used, ensure that the module is protected from electrostatic discharge, e.g., 

by storing it in its packaging. 

Only personnel with knowledge of ESD protective measures may modify or extend 

the system wiring.

The PFD and the PFH values have been calculated for the HIMax systems in accordance 

with IEC 61508. 

HIMA will gladly provide the PFD, PFH and SFF values upon request. 

A proof test interval of 10 years has been defined for the HIMax systems (offline proof test, 

see IEC 61508-4, paragraph 3.8.5). 

The safety functions, consisting of a safety-related loop (input, processing unit, output and 

safety communication among HIMA systems), meet the requirements described above in 

all combinations. 

Self-Test and Fault Diagnosis 

The operating system of the modules executes several self-tests at start-up and during 

operation. The following components are tested: 

ƒProcessors 

ƒMemory areas (RAM, non-volatile memory) 

ƒWatchdog 

ƒConnections between modules 

ƒIndividual channels of the I/O modules 

If faults are detected during these tests, the defective module or the defective channel of 

the I/O module is switched off. If the tests detect a module fault while starting up the 

module, the module will not begin to operate. 

In non-redundant systems, this means that sub-functions or even the entire PES will shut 

down. In case of a detected failure within a redundant system, the redundant module or 

redundant channel takes over the function to be performed.

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