Hardware reference guide

Ethernet Modules
35013379 02 October 2007 327
Introduction –
Server
All NOE771xx Quantum Ethernet TCP/IP modules provide the user with the ability
to access data from the controller using the standard MODBUS/TCP protocol. Any
device: PC, HMI package, another PLC, or any MODBUS/TCP compliant device can
access data from the PLC. The MODBUS/TCP Server also allows programming
panels to log into the controller over Ethernet.
Limitations The NOE771xx supports up to 64 simultaneous MODBUS/TCP Server connections.
The NOE771xx allows only one Programming Panel to be logged in at a time to
guarantee consistency of changes to the controller configuration.
The following MODBUS/TCP commands are supported by the NOE:
z Read Data
z Write Data
z Read/Write Data
z Get Remote Statistics
z Clear Remote Statistics
z MODBUS 125 Commands (used by programming panels to download a new
Exec to the NOE).
Performance The following table shows the performance characteristics of the NOE771xx’s
MODBUS/TCP Server.
FTP and HTTP
Server
The following information describes services provided by the FTP and HTTP
servers.
FTP Server The NOE771xx’s File Transfer Protocol (FTP) Server is available as soon as the
module receives an IP address. Any FTP client can log on to the module, if the client
uses the correct user name and password.
The FTP Server provides the following services:
z Update the NOE’s firmware by downloading a new Exec
z Provides error log visibility by uploading error log files
z Upload/download BOOTP Server and SNMP configuration files
Parameter Value
Typical Response Time (ms) 0.6
Number of MODBUS connections (Client and Server) 64 (-01, -11)
16 (Client -00)
32 (Server -10)
Number of simultaneous login channels 1
Note: NOE771xx MODBUS/TCP performance measurements are made with
Quantum 140CPU53414 PLC.
This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com