6-1
Section
Overview of Remote I/O Communications
70
6-1
Overview of Remote I/O Communications
The Master and Slaves can communicate as described below with DeviceNet
remote I/O communications.
•
Input Area:
Inputs at the Slave are read automatically and mirrored in the Master’s input
area.
•
Output Area:
Data written in the output area allocated in the Master’s memory are automati-
cally output to the corresponding Slave.
Reference The names of the input and output areas indicate the direction of I/O from the
perspective of the Master (host).
6-1-1 Data Exchange with the DeviceNet Interface Unit
The DeviceNet Interface Unit using remote I/O communications can exchange
data with the host to control the PT or check its status.
The three allocation settings listed below must be made in order to perform re-
mote I/O communications between the Master (PC) and PT using the DeviceNet
Interface Unit.
1, 2, 3...
1. The settings that allocate PT data (the PT status control/notify areas, win-
dow control area, or other elements) to PT memory
Allocated data
Allocation method
PT status control area, PT status notify
area, and window control area
Set the Control/Notify Area in the
NT-series Support Tool’s PT
Configuration settings.
Other
eleme
Numeral, character string, and
bit memory table data
Set in the NT-series Support Tool’s
Table settings.
nts
Lamps and touch switches
Set in each element’s properties
with the NT-series Support Tool.
The allocation settings above are the same as they are with a regular PT set
for Memory Link method.
2. The settings that allocate the DeviceNet Interface Unit’s input and output
areas in PT memory within the PT
Set the input and output areas with the CompoBus/D setting switches in the
PT’s system menu. (Other DeviceNet memory switch settings are also re-
quired. Refer to 5-5 DeviceNet Memory Switch Settings for details.)
3. The settings that allocate the DeviceNet Interface Unit’s input and output
areas in the I/O memory of the Master (PC) (Free allocation or fixed alloca-
tion can be used.)
