E.4
SEL-2414 Transformer Monitor Instruction Manual Date Code 20130214
Modbus Communications
Function Code Details
The device responses to errors in the query are shown in Table E.7.
05h Force Single Coil
Command
Use function code 05h to set or clear a coil. In Table E.8, the command response
is identical to the command request.
Table E.8 lists the coil numbers supported by the SEL-2414. The physical coils
(coils 0–34) are self-resetting. Pulsing a Set remote bit (decimal address 67–98)
causes the remote bit to be cleared at the end of the pulse.
Coil addresses start at 0000 (i.e., Coil 1 is located at Coil address 0000). If the
device is disabled, it will respond with error code 4 (Device Error). In addition to
Error Code 4, the device responses to errors in the query are shown in Table E.9.
06h Preset Single
Register Command
The SEL-2414 uses this function to allow a Modbus master to write directly to a
database register. Refer to the Modbus Register Map in Table E.15 for a list of
registers that can be written by using this function code. For six-digit addressing,
add 400001 to the standard database addresses.
Table E.7 Responses to 04h Read Holding Registry Query Errors
Error Error Code Returned
Communication Counter
Increments
Invalid register to read Illegal Data Address (02h) Invalid Address
Invalid number of registers to read Illegal Data Value (03h) Illegal Register
Format Error Illegal Data Value (03h) Bad Packet Format
Table E.8 05h Force Single Coil Command
Coil Address
in Decimal
Coil Address
in Hex
Function Code
Supported
Coil Description
0 0 01h OUT101
1 1 01h OUT102
2 2 01h OUT103
3–10 3–A 01h OUT301–OUT308
a
a
Returns 0 if not installed.
11–18 B–12 01h OUT401–OUT408
a
19–26 13–1A 01h OUT501–OUT508
a
27–34 1B–22 01h OUT601–OUT608
a
35–50 23–32 01h RB01–RB16
51–66 33–42 01h RB17–RB32
67–98 43–62 05h Pulse RB01–RB32
(1 SEL
OGIC Processing Interval)
Table E.9 Responses to 05h Force Single Coil Query Errors
Error Error Code Returned
Communication Counter
Increments
Invalid bit (coil) to read Illegal Data Address (02h) Invalid Address
Invalid bit state requested Illegal Data Value (03h) Illegal Register
Format Error Illegal Data Value (03h) Bad Packet Format
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