Schweitzer Engineering Laboratories SEL-700G Series, Инструкция по эксплуатации

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E.16
SEL-700G Relay Instruction Manual Date Code 20170814
Modbus RTU Communications
Communications Protocol
The Parameter Conversion field is defined in Table E.24.
Use Equation E.1 to calculate the actual (not scaled) value of the parameter
(setting):
Equation E.1
Use Equation E.2 to calculate the scaled setting value:
Equation E.2
The relay response to errors in the query are shown Table E.25.
2 DBL: 32-bit 1 when the following setting is a fractional value of this
setting
3 RA: RAM-only 1 when the setting is not saved in nonvolatile memory
4 RR: Read-only if running 1 when the setting is read-only if in running/operational
state
5‘ P: Power Cycle or Reset 1 when the setting change requires a power cycle or
reset
6 0 Reserved
7 Extend Reserved to extend the descriptor table
Table E.24 60h Read Parameter Conversion Field Definition
Conversion
Value
Type Multiplier Divisor Offset Base
0 Boolean 1 1 0 1
1 Unsigned Integer 1 1 0 1
2 Unsigned Integer 1 10 0 1
3 Unsigned Integer 1 100 0 1
4 Unsigned Integer 1 1000 0 1
5 Hexadecimal 1 1 0 1
6 Integer 1 1 0 1
7 Integer 1 10 0 1
8 Integer 1 100 0 1
9 Integer 1 1000 0 1
10 Enumeration 1 1 0 1
11 Bit Enumeration 1 1 0 1
Table E.25 Responses to 60h Read Parameter Information Query Errors
Error Error Code Returned
Communications
Counter Increments
Illegal parameter to read Illegal Address (02h) Invalid Address
Table E.23 60h Read Parameter Descriptor Field Definition (Sheet 2 of 2)
Bit Name Description
value
ParameterValue Offset +
 
Multiplier Base • •
Divisor
---------------------------------------------------------------------------------------------------------------------------- =
value
value Divisor •
Multiplier Base •
---------------------------------------------- Offset – =