Mitsubishi Electric MELSEC iQ-R02CPU - 1.6 Communications Using the Random Access Buffer; Setting Procedure

94
1 FUNCTIONS
1.6 Communications Using the Random Access Buffer
1.6 Communications Using the Random Access
Buffer
With communications using the random access buffer, data can be freely read and written between any external device
(excluding Ethernet-equipped module) and the RJ71EN71 or the RnENCPU (network part). The external device does not
need to be fixed. The random access buffer is used as the common buffer area for external devices connected to the
Ethernet.
Precautions
The CPU module (CPU part for the RnENCPU) cannot exchange data with the random access buffer.
Setting procedure
Set "External Device Configuration" under "Basic Settings". ( Page 244 External Device Configuration)
1. Select the external device to be connected in "Module List" and drag it to "List of devices" or "Device map area".
2. Set "Communication Method" for external device to "Random Access Buffer".
3. Set the IP address of the external device.
4. Set the other parameters required for communication in the connection. ( Page 244 External Device Configuration)
External device name Description
UDP Connection Module Select to communicate with the external device using UDP/IP
Active Connection Module Select to perform the open processing to the external device from the Ethernet-equipped module (Active open)
and communicate using TCP/IP.
Unpassive Connection Module Select to receive the open processing from an unspecified external device (Unpassive open) and communicate
using TCP/IP.
Fullpassive Connection Module Select to receive the open processing from the specified external device (Fullpassive open) and communicate
using TCP/IP.
Writing
External
device
External
device
External
device
External
device
External
device
Random
access
buffer
Reading
Writing
Reading
Writing
Reading
Writing
Reading
Writing
Reading
RJ71EN71 or RnENCPU
(network part)