This technical note describes an issue when using DeltaV DC/DC Power Supplies along with VIM1's. This problem impacts both M and S Series VIM's, and simplex and redundant applications of all firmware types.
Background: A problem has been identified using the DeltaV DC/DC Power Supplies (VE5009 and SE5009) with the DeltaV Virtual IO Module (VIM1). It has been observed that after power failure or power cycle, the commissioned and online VIM1 will lose its configuration or enter decommissioned state. The user must re-commission the VIM1 to its placeholder and re-upload the configuration. This behavior does NOT occur when the DeltaV AC/DC Power Supply (VE5001) or the older model of the DC/DC Power Supply (VE5008) is used.
MYNAH Technologies is working with Emerson’s DeltaV Development team for a solution to this issue. Users can verify if they have the older or newer type of DC/DC Power Supply by looking at assembly part numbers. The assembly part numbers are imprinted on the label located on the bottom of the Power Supply. KJ1501X1-BC2 is the part number for the older DC/DC Power Supply (VE5008). The new enhanced DC/DC Power Supplies are KJ1501X1-BC3 (VE5009) and KJ1501X1-BK1 (SE5009).
All Virtual IO Module firmware revisions are affected.
Firmware Solution: To work around this issue, the VIM saves its configuration in two places. Non Volatile RAM is the primary location. A copy of this is stored in EPROM as the secondary location. If the configuration in primary location is missing or corrupted, the configuration from EPROM is copied from secondary location into primary location. If the secondary location is also missing, the VIM will become decommissioned or not have any network to work with. Both these configuration locations are updated only when you upload from the VIMNet Explorer.
All firmware versions apply this solution.
Procedure: After a VIM is flashed with new firmware, the secondary configuration location is erased because it is in EPROM. After firmware flash completion, the VIM configuration must be uploaded. This writes the configuration into the secondary EPROM location. Thereafter if the VIM loses power and its NV RAM gets corrupted, the configuration is restored from EPROM. If the VIM is not uploaded after firmware flash completion, there will be no backup to restore.
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