Dear All,

Our user have existing configuration as follow

1. Redundant PLC Process and Safety using 414-4H (Process : 2 CPU, Safety : 2 CPU)

2. There are 4 standalone HMIs (WinCC v6.0 SP4, OS : Windows XP SP2) as follow

    a. HMI 1 and 2 are monitoring internal process

    b. HMI 3 and 4 are monitoring export metering process

User is planning to upgrade :

1. Redundant PLC Process and safety from 414-4H to 414-5H

2. Upgrade only HMI 4

3. Combine two applications of WinCC so each HMI has identical application

Please advise the SOP to upgrade the PLC and HMI.

regards,

Jerry