Rockwell Automation 2711P Creating Modbus Applications - Manual (Page 77)

77 Publication 2711P-UM002B-EN-P - March 2007
Appendix
E
Modbus (RTU) Serial Address Definitions
This appendix describes valid tag addressing for Modbus (RTU) Serial
communications. This information is also available in the Modbus
driver online help in KEPServer Enterprise. KEPServer drivers use
decimal addressing.
Output Coils
Example:
The 255th output coil would be addressed as ’0255’ using decimal
addressing or ’H0FF’ using hexadecimal addressing.
Input Coils
Example:
The 127th input coil would be addressed as ’1127’ using decimal
addressing or ’H17F’ using hexadecimal addressing.
Output Coils (Function Codes: 01, 05, 15)
Decimal Addressing Hexadecimal Addressing
Type Boolean
Format 0xxxxx H0yyyyy
Security Read/Write
Range 000001 - 065536 H000001 - H0FFFF
Input Coils (Function Code 02)
Decimal Addressing Hexadecimal Addressing
Type Boolean
Format 1xxxxx H1yyyyy
Security
Read
(1)
(1) For unsolicited device 127.0.0.1.0, these locations are Read/Write.
Range 100001 - 165536 H100001 - H1FFFF