ProSoft Technology MVI69-MCM User Manual
Page 143
MVI69-MCM ♦ CompactLogix or MicroLogix Platform
Reference
Modbus Communication Module
User Manual
ProSoft Technology, Inc.
Page 143 of 167
March 22, 2011
5.6.10 Preset Multiple Registers (Function Code 16)
Query
Holding registers existing within the controller can have their contents changed
by this message (a maximum of 60 registers). However, because the controller is
actively scanning, it also can alter the content of any holding register at any time.
The values are provided in binary up to the maximum capacity of the controller
(16-bit for the 184/384 and 584); unused high order bits must be set to zero.
Note: Function codes 5, 6, 15, and 16 are the only messages that will be recognized as valid for
broadcast.
Adr
Func
Hi
Add
Lo Add
Quantity
Byte
Cnt
Hi
Data
Lo
Data
Hi
Data
Lo Data Error Check
Field
11
10
00
87
00
02 04
00
0A
01
02
CRC
Response
The normal response to a function 16 query is to echo the address, function
code, starting address and number of registers to be loaded.
Adr
Func
Hi Addr
Lo Addr
Quantity
Error Check Field
11
10
00
87
00
02
56