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.
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.
CTI 2595 - 16-point TTL/Word Output Module
CTI 2596-8 - 8-point 11-125 VDC Output Module
CTI 2597-8/16/32-point 11-125 VDC Output Module
CTI 2598-8 - 8-point 11-240 VAC Output Module
CTI 2599-8/16/32-point 11-240 VAC Output Module
CTI 2530-8-point Form-C Relay Output Module
CTI 2532-16-point Form-A Relay Output Module
CTI 2534-8-point Form-C Relay Output Module
CTI 2501 - 8in/4Out Analog Module
CTI 2550-A - 8-Channel Isolated Analog Input Module
CTI 2555-A - 16-Channel Analog Input Module
CTI 2558 - 8-Channel Analog Input Module
CTI 2560-A - 8-Channel Isolated Analog Output Module
CTI 2551-A - 8-Channel Isolated Thermocouple Input Module
CTI 2552-A - 8-Channel Isolated RTD Input Module
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