NAiS FP2, Technical Manual

Page: 38 / 144

4-4
4.1.2
General-purpose Serial Communciation Mode
•
In general-purpose serial comm unication, data is sent and received over the COM ports to and from
an external device such as an image processing device or a bar code reader.
•
Data is read from and written to an external device connected to the COM port by means of an
FP2/FP2SH ladder program.
- Applicable communication block
For 1:1 communication RS232C FP2-CB232 (Product No.: AFP2803)
RS422 FP2-CB422 (Product No.: AFP2804)
For 1:N communication RS485 FP2-CB485 (Product No.: AFP2805)
(C-NET)
4.1.3
Computer Link Mode
•
Computer link is used for comm unication with a computer connected to the PLC. Instructions
(command messages) are transmitted to the PLC, and the PLC responds (sends response messages)
based on the instructions received.
•
A proprietary MEWNET protoco l called MEWTOCOL-COM is used to exchange data between the
computer and the PLC. There are two different communication methods, 1:1 and 1:N communication. A
1:N network is called a C-NET.
•
The PLC answers automatically to the commands received from the computer, so no program is
necessary on the PLC side in order to carry out communication.
- Applicable communication block
For 1:1 communication RS232C FP2-CB232 (Product No.: AFP2803)
RS422 FP2-CB422 (Product No.: AFP2804)
For 1:N communication RS485 FP2-CB485 (Product No.: AFP2805)
(C-NET)