E.9
Date Code 20081022
Instruction Manual
SEL-787 Relay
Modbus RTU Communications
Communications Protocol
The relay responses to errors in the query are shown in
05h Force Single Coil
Command
Use function code 05h to set or clear a coil. In
, the command
response is identical to the command request.
lists the coil numbers supported by the SEL-787. The physical
coils (coils 1–27) are self-resetting. Pulsing a Set remote bit (decimal address
59 through 99) causes the remote bit to be cleared at the end of the pulse.
Table E.11
04h Read Input Register Command
Bytes
Field
Requests from the master must have the following format:
1 byte
Slave Address
1 byte
Function Code (04h)
2 bytes
Starting Register Address
2 bytes
Number of Registers to Read
2 bytes
CRC-16
A successful response from the slave will have the following format:
1 byte
Slave Address
1 byte
Function Code (04h)
1 byte
Bytes of data (
n
)
n
bytes
Data (2–250)
2 bytes
CRC-16
Table E.12
Responses to 04h Read Input Register Query Errors
Error
Error Code Returned
Communication
Counter Increments
Illegal register to read
Illegal Data Address (02h)
Invalid Address
Illegal number of registers to read
Illegal Data Value (03h)
Illegal Register
Format error
Illegal Data Value (03h)
Bad Packet Format
Table E.13
05h Force Single Coil Command
Bytes
Field
Requests from the master must have the following format:
1 byte
Slave Address
1 byte
Function Code (05h)
2 bytes
Coil Reference
1 byte
Operation Code (FF for bit set, 00 for bit clear)
1 byte
Placeholder (00)
2 bytes
CRC-16
Table E.14
01h, 05h SEL-787 Output
(Sheet 1 of 3)
Coil Address (Decimal)
Function Code Supported
Coil Description
0
01, 05
Pulse OUT101 1 second
1
01, 05
Pulse OUT102 1 second
2
01, 05
Pulse OUT103 1 second
3
01, 05
Pulse OUT301 1 second
4
01, 05
Pulse OUT302 1 second
Summary of Contents for SEL-787
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