Omron Sysmac NX1P2-10 1 Series, Руководство пользователя

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1st send
request
2nd send
request
Data B
2,000 bytes
Data A
2,000 bytes
Data B
Data A (upper bytes)
Data A (lower bytes)
4,000 bytes
Data B
Data A (upper bytes)
Data A (lower bytes)
1,000 bytes
2,000 bytes
1,000 bytes
Built-in EtherNet/IP port
User program
Sending node (host computer)
Receiving node (Controller)
Receive buffer
(9,000 bytes)
User program
Ethernet line
(1) Data received to
receive buffer.
(2) 1st receive
request (request
for 1,000 bytes)
(3) 2nd receive
request (request
for 2,000 bytes)
The remaining
data is discarded.
• When Only One Receive Request Is Made for Data Sent for Multiple Send Requests
If data is sent for multiple sent requests, you cannot receive the entire data with one receive request
regardless of the size of the data.
Example 2: 1,000-Byte Receive Request Is Made for 200-Byte Data Sent for Two Send Requests
1. The data is divided to be sent in two sends from the sending node, and is stored in the receive
buffer.
2. Even if a receive request is made for 2,000 bytes, only 100 bytes of the data is received as re-
quested with the first send request.
100 bytes
Data A
Data B
100 bytes Data A Data A
Data B 100 bytes
Sending node (host computer) Receiving node (Controller)
Data B
1st send
request
2nd send
request
Built-in EtherNet/IP port
User program
200 bytes
Receive buffer
(9,000 bytes)
User program
You can receive the rest
of the data with another
receive request.
Ethernet line
(1) Data received to
receive buffer.
(2) 1st receive request
(request for 1,000
bytes)
9 Socket Service
9-8
NJ/NX-series CPU Unit Built-in EtherNet/IP Port User’s Manual (W506)