FPL and LVL software modification procedures

NOTE Modification appiies primariiy to changes occurring during the cperationai phase of the software. 

1 The objective of the requirements of this clause is to ensure that the software continues to meet the software safety requirements specification after modifications. 

1 Modifications shall be carried out in accordance with 5.2.6.2.2, 5.2.7 and Clause 17 with the foiiowing additionai requirements. 

Wherever possible, on-line modifications to a safety instrumented system should be avoided. If on-line modifications are required, the complete procedure should be documented and approved according to the safety planning. 

The following process is recommended for all changes to programmable safety instrumented systems  

A program to modify a programmable safety instrumented system should be managed, planned and resourced to the appropriate level to ensure the safe implementation of the change. 

Copyright International Society of Automation Provided by IMS under license with ISA 

No reproduction or networking permitted without license from IMS 

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