CTI 2558 - 8-Channel Analog Input Module

TCP/IP Overview

The CTI 2572 module uses TCP/IP (Transmission Control Protocol/Internet Protocol) to transport

messages between the module and other nodes on the network.  TCP/IP is a suite of protocols that

provide routing and delivery services for messages between application programs running on

different processors (called hosts in TCP/IP terminology).  You may select between connectionless

(packet based) or connection-oriented (stream based) delivery services.

Connectionless Delivery

Connectionless delivery services allow you to send a message to another node without previously

establishing a logical connection to the other node. TCP/IP provides a format known as the USER

DATAGRAM PROTOCOL (UDP) for sending and receiving connectionless messages. Connectionless

delivery is simple to implement and consumes a small amount of system resources. However,

delivery of UDP messages is not confirmed by the network protocol.  It is left to higher level

protocols to acknowledge receipt of a message. Since the Common ASCII Message Protocol (CAMP)

used with the 2572 will acknowledge receipt of a command message, UDP is the preferred protocol

for most applications, such as process monitoring, which obtain data from the PLC.

The 2500 Series® Compact Controllers bring exciting new features and a new level of

process performance to CTI’s 2500 Series® Control Systems. The Compact Controller

easily handles small to large discrete and process applications.

Compact processors have the same features and performance as our Classic processors,

and include PID loops, alarms and special mathematical functions to make them perfect

for process applications.