Figure 4.15 command frame, Figure 4.16 response frame, Write variable address – Rockwell Automation 900 Temperature Controller Communications Functions - Series B User Manual
Page 73: Variable write, single/operation command -15, Variable write, single/operation command
Publication 900-UM004D-EN-E - July 2010
Modbus Communications Procedure
4-15
Variable Write, Single/Operation Command
This function performs operations such as writing to the variable area (single)
and operation commands (communications writing, RUN/STOP, multi-SP,
AT execute/cancel, write mode, save RAM data, software reset, move to setup
area 1, move to protect level, auto/manual switch, initialize settings, alarm
latch cancel, invert direct/reverse operation, and program start.) Writing is
enabled in only the 2-byte mode.
Figure 4.15 Command Frame
Figure 4.16 Response Frame
Write variable address
Specify the address of the setting data that is to be written. For details
on addresses, refer to Communications Data for Modbus on page 5-1.
For an operation command, specify 0000 or FFFF.
CRC-16
1
1
2
2
H'06
Write data
2 bytes
Slave
address
Function
code
Write variable
address
CRC-16
1
1
2
2
H'06
Write data
2 bytes
Slave
address
Function
code
Write variable
address