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Appendix D Modbus Functions
D03283R01.10 TESLA LITE User Manual Appendix D-11
Accessing TESLA LITE Event Information
All TESLA LITE detector event messages displayed in the Event Log are available via Modbus. This includes fault location infor-
mation. The following controls are available.
Refresh Event List (Function Code 6, address 42049): Fetches the latest events from the TESLA's event log and
makes them available for Modbus access. The most recent event becomes the current event
available for reading.
Acknowledge Current Event
and Get Next Event (Function Code 6, address 42050): Clears the current event from the read registers and
places the next event into them. An acknowledged event is no longer available for reading.
Get Next Event (Function Code 6, address 42051): Places the next event in the read registers without
acknowledging the current event. The current event will reappear in the list when Refresh
Event List is used.
Size of Current Event
Message (Function Code 3, address 42052): Indicates the number of 16 bit registers used to contain
the current event. Event data is stored with two characters per register. A reading of zero indi-
cates that there are no unacknowledged events available in the current set. (NB. The Refresh
Event List function can be used to check for new events that have occurred since the last
Refresh Event List.)
Fault Location Event Preset
When Set to 0x464C (Function Code 3, address 42053): Identifies fault location events. These events are identified
by “FL” (0x464C) in this register. Non-fault location events contain “ ” in this location.
Read Event Message (Function Code 3, addresses 42054 - 42137): Contains the current event message. Two
ASCII characters are packed into each 16 bit register. All unused registers in the set are set to
0.
Fault Location – Fault Locator
ID (Function Code 3, address 42138): If the current event is a fault location event, this register
contains the ID of the fault locator. The numbers from 1 to 5 are used for 18-channel record-
ers; the numbers from 1 to 10 are used for 36-channel recorders.
Fault Information – Type (Function Code 3, address 42139): If the current event is a fault location event, this register
contains the type of the fault.
The following type bitmap:
0x0001 - Phase A
0x0002 - Phase B
0x0004 - Phase C
0x0008 - Ground
Any number of the flags may be set for a given fault. If recorder could not determine the fault
type, then the register will not have any flags set and will read 0x0000.
Fault Information – Fault
Distance (Function Code 3, address 42140): If the current event is a fault location event, this register
contains the distance to the fault. It is scaled up by a factor of 10. The units are the same as
the units set in the relay configuration.
Fault Information –Time of
Fault (Function Code 3, addresses 42141 and 42144): If the current event is a fault location event,
these registers contain the time of the fault in seconds since 1970. Each of these 16-bit regis-
ters contains an 8-bit portion of a 32-bit time value. Register 42141 contains the upper 16 bits,
register 42144 contains the lower 16 bits.