Appendix E Modbus RTU Communication Protocol
Appendix E-8
L-PRO 4000 User Manual
D02706R02.30
• The L-PRO IED model number is 4000.
• Version and issue will each be positive integers, say X and Y.
• The L-PRO is defined as “Model 4000, Version X Issue Y”
Issue Number
Read Only
4 and 5
Issue number
Report Slave ID (Function Code 17/0x11)
Accessing L-PRO Event Information
All L-PRO detector event messages displayed in the Event Log are available via Modbus. This includes fault location information.
The following controls are available.
Refresh Event List
(Function Code 6, address 40513): Fetches the latest events from the relay'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 40514): 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 40515): 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 40516): Indicates the number of 16 bit registers used to contain
the current event. Event data is stored with 2 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
(Function Code 3, address 40517): Identifies fault location events. These events are identi-
fied by “FL” in this register. Non-fault location events contain “” in this location.
Read Event Message
(Function Code 3, addresses 40518 – 40570): Contains the current message. Two.
ASCII characters are packed into each 16 bit register. All unused registers in the set are set
to 0.
Fault Information – Type
(Function Code 3, address 40571): If the current event is a fault location event, this register
contains the type of 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 the relay could not determine the
fault type, then the register will not have any flags set and will read 0x0000.
Fault Information – Fault Dis-
tance
(Function Code 3, address 40572): 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 40573 to 40576): 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 reg-
isters contains an 8-bit portion of a 32-bit time value. Register 40573 contains the upper
most 8 bits, and register 40576 contains the lowest 8 bits.
Summary of Contents for L-PRO 4000
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