LSIS XGL-EFMT - Type of P2 P Service; Type of P2 P Instructions

Chapter 7 P2P Service
7-3
7.2 Type of P2P Service
7.2.1 Type of P2P Instructions
(1) P2P instructions
6 instructions are available for programming P2P communication service, and each instruction
will be used with different purpose according to respective service methods as described in the
table below, for reference.
Classification
Instruction
Purpose
XGT Client
Read
Reads the area specified by destination station.
Write
Transmits native station’s area data to destination station.
Write_NC
Transmits native station’s area data to destination station.
(No confirmation)
User defined
frame
Send
Transmits native station’s area data to destination station.
Send_NC
Transmits native station’s area data to destination station.
(No confirmation)
Receive
Saves the data received from destination station.
Modbus TCP
Client
Read
Reads the area specified by destination station.
Write
Transmits native station’s area data to destination station.
E-mail
ESend
Transmits a message if an event occurs.
EReceive
Receives a message if an event occurs.
[Table 7.2.1] Type of P2P instructions
Note
1) Difference between Write (Send) and Write_NC (Send_NC)
In general P2P communication, it sends the request data at start condition, and then it sends the
request data again at next start condition after receiving the response. If you use “Write_NC
(Send_NC)” instruction, it sends data at next start condition without receiving response. Because of
that, faster communication is available. The Read (Receive) service that requires response does
not support this option.
※ TX data for one start condition should be less than 3KB. If not, communication error may occur
2) For Write_NC, Send_NC instructions, the following version is needed.
Item
Version
XG5000
V3.61 or above
XGR CPU
V1.91 or above