LSIS XBE-DC08A, Руководство пользователя, Страница: 905 / 1284

Chapter 1 Built-in FEnet communication
1-26
Buil
t-
in
Comm
(3)
Function code h03 : Reading output word (Read Holding Registers)
• Request
Items Size Range
Function code 1 byte h03
Initial address 2 bytes h0000 ~ hFFFF
Number of inputs 2 bytes h0001 ~ h007D (125word)
• Response
Items Size Range
Function code 1 byte h01
Number of bytes 2 bytes 2 x N
Input status N x 2 bytes -
• Error
Items Size Range
Function code 1 byte h83 (Function code + h80)
Exceptional code 1 byte h01,h02,h03,h04
• Example of application
Request frame Response frame
Items HEX Items HEX
Function code h03 Function code h03
Initial address (upper byte) h00 Number of bytes h06
Initial address (lower byte) h6B Word status (108) h02
Number of words
(upper byte)
h00 Word status (108) h2B
Number of words
(lower byte)
h03 Word status (109) h00
Word status (109) h00
Word status (110) h00
Word status (110) h64
(4)
Function code h04 : Writing input word (Read Input Registers)
• Request
Items Size Range
Function code 1 byte h04
Initial address 2 bytes h0000 ~ hFFFF
Number of inputs 2 bytes h0001 ~ h007D (125word)
• Response
Items Size Range
Function code 1 byte h04
Number of bytes 2 bytes 2 x N
Input status N x 2 bytes -