GE IS200VSVAH1A IS200VSVAH1ADD MARK VI SERVO CARD

Description

GE General Electric Technical Specifications: IS200VSVAH1A

All Event Recorder data can be read from Modbus registers found in the address range 2000h – 20FFh.

The ‘Number of Events Since Last Clear’ register at address 2001h is incremented by one every time a new

event occurs. The register is cleared to zero when the Event Recorder is cleared. When a new event occurs, it

IS200VSVAH1A is assigned an ‘event number’ which is equal to the incremented value of this register; the newest event will

have an event number equal to the Number of Events. This register can be used to determine if any new

IS200VSVAH1A events have occurred by periodically reading the register to see if the value has changed. If the Number of

Events has increased then there are new events available.

Only the data for a single event can be read from the Modbus memory map in a single data packet. The ‘Event

Number Selector’ register at address 2000h selects the event number for which data can be read from the

memory map. For example, to read the data for event number 123, the value 123 must first be written to this

register. All the data for event number 123 can now be read from the ‘Event Record Data’ registers at

IS200VSVAH1A addresses 2010h to 201Dh. Only the last 128 events are actually stored in the relay’s memory. Attempting to

retrieve data for elder events that are not stored will result in a Modbus exception response when writing to the

‘Event Number Selector’.

The following example illustrates how information can be retrieved from the Event Recorder:

A SCADA system polls the Number of Events register once every minute. It now reads a value of 27 from the

register when previously the value was 24 which means that three new events have occurred. The SCADA

system writes a value of 25 to the Event Number Selector register. It then reads the data for event number 25

from the Event Record Data registers and stores the data to permanent memory for retrieval by an operator.

The system now writes the value 26 to the selector and then reads the data for event number 26. Finally, the

value 27 is written to the selector followed by reading the data for this event. All the data for the new events

has now been retrieved by the SCADA system so it resumes polling the Number of Events register.

The data for an event should be straightforward to interpret from the information given in the Memory Map

except for the ‘Cause of Event’ register. Data format F24 describes the event cause register which contains

several ‘fields’ of information. The ‘Event Type’ field determines how to interpret the remainder of the register.

Interpreting the event cause register is most easily described with several examples.

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