5-64 L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUALPRODUCT SETUP CHAPTER 5: SETTINGS5Figure 5-24: Insert new logical nodeIf the edit option is selected for the Master logical device, the Product LD inst name setting is not editable.Figure 5-25: Edit logical nodeWhen the Ok button is clicked, the entered values for Product LD inst name and Functional ldName are checked foruniqueness within the UR, and they are updated in the pane.The settings are explained as follows, where is a syntactic variable representing the present value of the IEDNAME setting. When adding or editing a logical device entry, these are the fields that need to be completed.Product LD inst nameRange: 1 to 64 VisibleString charactersDefault: as per the following tableEach logical device has this setting. The value is fixed at "Master" in the first logical device and configurable in all others.Valid characters are upper and lowercase letters, digits, and the underscore (_) character. The entered value sets thelogical device inst name. Each logical device inst name is required to be unique within the device, and it cannot be blank.Also, if the corresponding functional ldName setting is blank, the concatenation of the IED name and the logical deviceCustomized logical nodes are not saved in the URS file.
