Manual

8: ETHERNET USER COMMUNICATION
8-2 WEB SERVER CPU MODULE USER’S MANUAL FC9Y-B1278
User Communication Client
When a client connection is configured as the user communication client, the Web server CPU module communicates
with the specified server device according to the settings configured in the ETXD and ERXD instructions that are
programmed for the client connection. The remote host number and other communication settings can be configured in
the Connection Settings tab in the Function Area Settings dialog box.
Specifications (User Communication Client)
Note 1: The settings can be configured in the Connection Settings tab in the Function Area Settings dialog box.
Establishing/Disconnecting User Communication Client Connections
When user communication clients are configured, connections are established on TCP/IP protocol. The connections are
established when ETXD/ERXD instructions are executed or when the Web server CPU module is started to run (See Note
1 above). After a connection has been established, the connection will be kept open until either the Web server CPU
module is stopped or a special internal relay allocated to the connection is turned on.
User Communication Client Receive Instruction (ERXD) Cancel Flag
The allocation of the user communication receive instruction cancel flags for each client connection is shown in the table
below. For details about the user communication receive instruction cancel flag, see chapter 10 of the FC5A user’s
manual basic volume.
Item User Communication Client
Remote host number 1 to 255
Establish connection
• When ETXD/ERXD Instructions are executed
• When the Web server CPU module starts to run (Note 1)
Disconnect connection
• When the Web server CPU module is stopped
• When special internal relays (M8230 to M8232) are turned on
Number of remote hosts that the CPU
module can communicate simultaneously
One remote host per a user communication client
Receive timeout (Note 1) 10 to 2550 ms (10 ms increments); Default: 500 ms
Device Address Description Operation
M8230 Client Connection 1 Disconnect
When the reply is turned on, the corresponding
connection is disconnected.
M8231 Client Connection 2 Disconnect
M8232 Client Connection 3 Disconnect
Device Address Description
M8171 User Communication Receive Instruction Cancel Flag (Client Connection 1)
M8172 User Communication Receive Instruction Cancel Flag (Client Connection 2)
M8173 User Communication Receive Instruction Cancel Flag (Client Connection 3)