GE IS215UCVDH5A semiconductor card

SOE over Modbus is implemented as a service running on a CI. When enabled, the service manages a “window” of Modbus addresses that implement the protocol, which is automatically available on all ports of that module which are configured as Modbus Slaves. The settings in the Modbus Slave Configuration window define a block of register addresses which provide a window for accessing events. Selecting the Enable check box enables the service. Once enabled, the Base Address and Block Count fields will become active. • Base Address Field: This field specifies that starting address of the window that the protocol will use. It can be located at any valid Modbus holding register address (i.e. Modbus addresses in the 40,000 to 49,984 range). As this field is modified, the End Address field will be updated.

• Block Count Field

 This specifies the number of events that can be read by the Modbus Master in a single Modbus read. Each event block requires 4 Modbus holding register addresses. As the Block Count field is modified, the End Address field will be updated. The Event Block Count must specify at least 2 event blocks. • End Address Field: The End Address field specifies the last address of the Modbus address “window” that the SOE Over Modbus protocol will use. It is calculated as: o start address as specified in the Base Address field o + 7 (for protocol overhead) o + (the number of blocks as specified in the Block Count field * 4)

The Modbus address

 “window” as indicated by the Base Address and End Address fields should be reserved exclusively for use by the SOE over Modbus service. Defining a variable with a conflicting Modbus address may lead to loss of events, corrupted event data, or protocol errors that prevent the continued operation of the SOE over Modbus service. The SOE over Modbus protocol and data block format are described in section 7 of this document

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