IDEC MicroSmart Pentra - Manual (Page 77)

W EB S ERVER CPU M ODULE U SER ’ S M ANUAL FC9Y-B1278 7-1
7: M
AINTENANCE
C
OMMUNICATION
S
ERVER
Introduction
This chapter describes the specification and configuration procedure of the maintenance communication server
functions of the Web server CPU module.
Applications
The Web server CPU module features the maintenance communication server functions. WindLDR can monitor the
device values in the Web server CPU module and can also download or upload the user program to or from the Web
server CPU module through the maintenance communication server.
Description of Functions
The Web server CPU module can be configured as a maintenance communication server. The maintenance
communication server can be used simultaneously with other server/client connection communications.
By using the maintenance communication server of the Web server CPU module, the network devices supporting the
maintenance communication, such as touch screens or WindLDR, can read and write the device values in the Web server
CPU module. There is a maximum of three maintenance communication server connections available in the Web server
CPU module as standard. In addition to those 3 connections, a maximum of eight server connections can be configured
as the maintenance communication server. If all server connections are configured as the maintenance communication
server, a total of 11 network devices supporting the maintenance communication can communicate with the Web server
CPU module simultaneously.
The Web server CPU module also supports the pass-through over Modbus RTU. When the Web server CPU module is
configured as Modbus RTU master, it is possible for a remote computer to communicate with FC5A MicroSmart CPU
modules configured as Modbus RTU slaves via the Web Server CPU module. Device values or user programs of those
slaves can be read/written from a remote computer.
The user program can be transferred with the Web server CPU module using the standard maintenance communication
server. However, the user program cannot be transferred using the additional server connections configured as the
maintenance communication server.
Pass-Through over Modbus RTU
The pass-through over Modbus RTU enables you to monitor FC5A MicroSmart CPU modules configured as Modbus RTU
slaves via a Web server CPU module configured as Modbus RTU master from a remote computer. You can remotely read/
write device values or transfer the user programs of the Modbus RTU slaves.
The Web server CPU module with the system program version 1.20 or later can be used as the master of Modbus RTU
pass-through. FC5A MicroSmart CPU modules with the system program version 2.40 or later can be used as the slaves of
Modbus RTU pass-through. The Web server CPU modules (FC5A-K1E/S1E) cannot be used as the slaves.