YOKOGAWA F3SP71-4S, User Manual

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3-14
IM 34M06P15-03E 2nd Edition: Jan. 31, 2012-00
3.12 Read/Write Multiple Registers ($17)
Reads and writes multiple holding registers. Processing consists of writing followed by
reading.
The amount of devices that can be accessed with a single request is 1 to 125 points for
reading and 1 to 121 points for writing.
Request Format (Master => Slave)
F030114.VSD
Function
Code
Data
$17
1-byte 2-byte 2-byte
Read Starting Holding
Register Nos.
($0000 to $FFFF)
Read Points
($0001 to $007D)
n
Response Format (Slave => Master)
(At Normal Completion)
(At Faulty Completion)
Data
$97
1-byte
Error Code
1-byte
Data
$17
1-byte 2-byte 2-byte
Device Data
1
Device Data
n
Data
Write
Length
m×2
2-byte
Write Starting Holding
Register Nos.
（
$0000 to $FFFF
）
1-byte 2-byte
Device Data
1
Device Data
m
2-byte
･･･
2-byte
Write Points
（
$0001 to $0079
）
m
Function
Code
1-byte
Read
Length
n×2
Function
Code
Writing and reading processes are performed using separate scans.