IDEC MicroSmart Pentra - Manual (Page 81)

W EB S ERVER CPU M ODULE U SER ’ S M ANUAL FC9Y-B1278 8-1
8: E
THERNET
U
SER
C
OMMUNICATION
Introduction
This chapter describes the Ethernet user communication for the Web server CPU module. Ethernet user communication
works on TCP/IP protocol. The Web server CPU module can be used as a user communication client/server. With Ethernet
user communication instructions (ETXD and ERXD instructions), the Web server CPU module can exchange the data with
devices on the network.
Except for the port number and the allocation of user communication receive instruction cancel flags, Ethernet user
communication instructions (ETXD and ERXD instructions) are identical to TXD and RXD instructions. For details about
TXD and RXD instructions, see chapter 10 of the FC5A user’s manual basic volume.
Ethernet User Communication Overview
The Web server CPU module can be used as an Ethernet user communication client/server. It can be used simultaneously
with the maintenance communication server, Modbus TCP server, and Modbus TCP client.
When using the Web server CPU module user communication server, the client devices can access the Web server CPU
module, and the communication can be performed between the Web server CPU module and the client devices. A
maximum of eight server connections of the Web server CPU module can be allocated to user communication. If all eight
connections are allocated to user communication, a maximum of eight client devices can simultaneously access and
communicate with the Web server CPU module.
When using the Web server CPU module user communication client, the Web server CPU module can access and
communicate with the server devices using the protocol of the server device. A maximum of three client connections of
the Web server CPU module can be allocated to user communication.
User communication client functions and configuration are described in “User Communication Client” on page 8-2. User
communication server functions and configuration are described in “User Communication Server” on page 8-5.
WindLDR version 6.4 or higher is required to use Ethernet user communication.