WEB S ERVER CPU MODULE U SER ’S MANUAL FC9Y-B1278 8-18: ETHERNET USER C OMMUNICATIONIntroductionThis chapter describes the Ethernet user communication for the Web server CPU module. Ethernet user communicationworks on TCP/IP protocol. The Web server CPU module can be used as a user communication client/server. With Ethernetuser communication instructions (ETXD and ERXD instructions), the Web server CPU module can exchange the data withdevices on the network.Except for the port number and the allocation of user communication receive instruction cancel flags, Ethernet usercommunication instructions (ETXD and ERXD instructions) are identical to TXD and RXD instructions. For details aboutTXD and RXD instructions, see chapter 10 of the FC5A user’s manual basic volume.Ethernet User Communication OverviewThe Web server CPU module can be used as an Ethernet user communication client/server. It can be used simultaneouslywith 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 CPUmodule, and the communication can be performed between the Web server CPU module and the client devices. Amaximum of eight server connections of the Web server CPU module can be allocated to user communication. If all eightconnections are allocated to user communication, a maximum of eight client devices can simultaneously access andcommunicate with the Web server CPU module.When using the Web server CPU module user communication client, the Web server CPU module can access andcommunicate with the server devices using the protocol of the server device. A maximum of three client connections ofthe 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. Usercommunication 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.Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com
