SCYC51010 58052515G ABB Spare parts of circuit board controller system module

SCYC51010 58052515G ABB Spare parts of circuit board controller system module

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For SIL3 loops the configured diagnostic cycle time (FDRT) setting can be

replaced, by a shorter FDRT calculated according to the formula below. The use of a

shorter calculated FDRT assumes that the user takes care of the safety reaction,

bringing the affected loop to a safe state. The configurd diagnostic cycle time

(FDRT) can be set higher but it is still active, setting shall be based on requirement

for the SIL2 loops.

FDRTmax= (Input error detection) + 2*(Application interval time) + (Output error

detection)

The (Input error detection) is given by the maximum value of one of the following

parameters:

• Modulebus scan time.

• DI880 or AI880A FDRT from Table 14. Response times for SIL2 systems on

page 104.

The largest value of the two parameters shall be used in the calculation see

Table 15. SIL3 FDRT Example 1 on page 107 and Table 16. SIL3 FDRT example 2

on page 108.