HIMA F7553

Product Dimensions：

The module contains a redundant, safety-related processor system. Because of this, all the

tests are executed directly on the module. The main test routines are:

一Linearity of the A/D converters

- Overflow of the A/D converters

- Cross talking between the eight input channels

Function of the input filters

一Function of the I/0 bus communication

- Self tests of the microcontrollers

- Tests of the memories

Notes to the safety-related operation and use

Screened cables have to be used for the field input circuits, twisted cables are recommended.

If it is sure that the environment of the transmitter up to the module is free from interferences

and the distance is relatively short (e. g. inside a cabinet) then the cabling can be performed

without screened cables or twisted cables. However, the interference immunity of the analog

inputs can only be achieved by using screened cables.

Planning notes for ELOP II

For each input channel of the module exists an analog input value and an appertaining channel

fault bit. With activated channel fault bit a safety-related reaction has to be programmed in

ELOP II related to the corresponding analog input.

Recommendations for the use of the module according to IEC 61508, SIL 3

- Cables for power supply shall be locally separated from the input circuits,

- Application of a suitable earthing must be regarded,

Measures against rising of the temperature have to be taken outside of the module, e. g. .

fans in the cabinet,

- Recording events in a logbook for operation and maintenance.

A maintenance of the module is not required. In case of fault there is a switch-off. The failed

module must be replaced.

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