In Ecostruxure Process Expert 2020R2, after creating a Safety controller in Topology, by default "BME P58 4040S" safety controller will be selected in hardware configuration.

When user tries to change the default Controller part number to any Hot standby Safety Controller, System gives error as mentioned below.



This means, the current selected controller is in Cyclic MAST task and the replacement controller (Hot standby safety) does not support Cyclic MAST task. There fore replacement had failed.

In order to replace a Hot standby Safety Controller, first change the Mast Task Property from Cyclic to Periodic as shown in below picture.



After performing this setting, User can able to change/replace default Safety Controller to required Hot Standby Safety Controller.

This document is applicable for Ecostruxure Process Expert 2020R2 Software.

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