Sel 751A, Инструкция по эксплуатации

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E.8
SEL-751A Relay Instruction Manual Date Code 20100129
Modbus RTU Communications
Communications Protocol
The relay responses to errors in the query are shown in Table E.8 .
03h Read Holding
Register Command
Use function code 03h to read directly from the Modbus Register Map shown
in
Table E.32 . You can read a maximum of 125 registers at once with this
function code. Most masters use 4X references with this function code. If you
are accustomed to 4X references with this function code, for five-digit
addressing, add 40001 to the standard database address.
816–823 2 Relay Element Status Row 102
824–831 2 Relay Element Status Row 103
832–839 2 Relay Element Status Row 104
840–847 2 Relay Element Status Row 105
848–855 2 Relay Element Status Row 106
856–863 2 Relay Element Status Row 107
864–871 2 Relay Element Status Row 108
872–879 2 Relay Element Status Row 109
880–887 2 Relay Element Status Row 110
888–895 2 Relay Element Status Row 111
896–903 2 Relay Element Status Row 112
904–911 2 Relay Element Status Row 113
912–919 2 Relay Element Status Row 114
920–927 2 Relay Element Status Row 115
928–935 2 Relay Element Status Row 116
936–943 2 Relay Element Status Row 117
944–951 2 Relay Element Status Row 118
952–959 2 Relay Element Status Row 119
a
The input numbers are assigned from the right-most input to the left-most input in the Relay
row as show in the following example.
Address 7 = ENABLED
Address 6 = TRIP
Address 5 = T01_LED
Address 4 = T02_LED
Address 3 = T03_LED
Address 2 = T04_LED
Address 1 = T05_LED
Address 0 = T06_LED
Table E.8 Responses to 02h Read Input Query Errors
Error Error Code Returned
Communication
Counter Increments
Invalid bit to read Illegal Data Address (02h) Invalid Address
Invalid number of bits to read Illegal Data Value (03h) Illegal Register
Format error Illegal Data Value (03h) Bad Packet Format
Table E.7 02h SEL-751A Inputs (Sheet 4 of 4)
Coil Address
(Decimal) Function Code
Supported
Coil Description
a