BMX P34 20x0 Ethernet Services

Introduction

Described below are the services that are available for the BMX P34 20x0 CPUs.

NOTE: Elsewhere in this guide are more detailed descriptions of the individual services.

Security

You can enhance security for your project by disabling the FTP/TFTP and HTTP services at times when you do not need to use them. The CPU uses the HTTP service to provide access to the embedded Web pages. The CPU uses the FTP and TFTP services to support various features including firmware upgrades, FDR services, and Ethernet remote IO.

Modbus TCP Messaging

The Modbus TCP messaging service allows the exchange of data between devices supporting Modbus over TCP/IP.

Maximum Capacity

The maximum frame size depends on the type of transaction:

For messaging, the maximum frame size is 256 bytes.

The BMX P34 20x0 CPUs allow you to:

manage these TCP connections using port 502 messaging:
- servers (32 connections)
- clients (16 connections)
- Transparent Device Access (2 connections)

NOTE: Elsewhere in this guide is detailed information for opening and closing connections.

SNMP

SNMP (simple network management protocol) is a UDP/IP standard protocol used to monitor and manage nodes on an IP network. The supports both the MIB II and the Transparent Ready Private MIB.

FDR Client

In the event of a device malfunction, the Fast Device Replacement service automatically reconfigures the replacement CPU in accordance with its device name. The new device retrieves its IP addresses, network parameters, and FDR file path from a DHCP server.

Embedded Web Pages

The BMX P34 20x0 CPUs support the diagnostics Web pages that you can access through the Modicon M340 Diagnostics screen.

Bandwidth Monitoring

The Bandwidth Monitoring service indicates how a communication module's CPU is shared between services (such as global data, I/O scanner, messaging, etc.).

SMTP

The BMX P34 20x0 processors include an SMTP client, which is an electronic mail notification service that allows controller-based projects to report alarms or events. The controller monitors the system and dynamically creates an electronic mail message to alert local or remote users. The PLC sends the mail message to a mail server on the network for distribution.

Transparent Device Access

Transparent Device Access (TDA) functionality means that clients that run Control Expert (and that are connected to a USB, Ethernet, or Modbus terminal port of a communications module) can access or download applications to devices on distributed control networks. The reverse, however, is not true. In other words, a Control Expert PC connected to the CPU’s Modbus port can access devices on other core networks, but those remote devices can not access other devices on different networks through the PLC station.