CTI 2572-B Operating instructions

CTI 2572-B / 2500C-2572-B
ETHERNET TCP/IP MODULE
INSTALLATION AND OPERATION GUIDE
Version 2.2

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CTI 2572-B Installation and Operation Guide
Copyright 2016 Control Technology Inc.
All rights reserved
This manual is published by Control Technology Inc. (CTI) 5734 Middlebrook Pike, Knoxville, TN 37921. This
manual contains references to brand and product names which are tradenames, trademarks, and/or
registered trademarks of Control Technology Inc. Siemens®, SIMATIC®, and Series 505®, and 505® are
registered trademarks of Siemens AG. Other references to brand and product names are tradenames,
trademarks, and/or registered trademarks of their respective holders.
DOCUMENT DISCLAIMER STATEMENT
Every effort has been made to ensure the accuracy of this document; however, errors do occasionally occur.
CTI provides this document on an “as is” basis and assumes no responsibility for direct or consequential
damages resulting from the use of this document. This document is provided without express or implied
warranty of any kind, including but not limited to the warranties of merchantability or fitness for a particular
purpose. This document and the products it references are subject to change without notice. If you have a
comment or discover an error, please call us toll-free at 1-800-537-8398 or email us at
[e-mail].
REVISION HISTORY
1.0
7/12/2016
Initial Release
2.0
9/20/2016
Added 2500C-2572-B module information
Added PWR bit to WX/WY Quick Reference diagram
2.1
10/11/16
Revised Document Title
2.2
11/8/2016
Corrected the label for the illustration of the 2500C-2572-B PC board

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CTI 2572-B Installation and Operation Guide
PREFACE
This Installation and Operation Guide provides reference information for the CTI 2572-B Ethernet TCP/IP
Module. The information in this manual is directed to individuals who will be installing and/or using the
module, developing PLC logic to control or monitor the product operation, or maintaining the product.
We assume you are familiar with the installation and operation of:
1) CTI 2500® Series and/or Siemens SIMATIC® 505 programmable controllers,
2) Ethernet local area networks,
3) Transmission Control Protocol/Internet Protocol (TCP/IP).
Please refer to the appropriate user documentation for specific information on programmable controllers and
I/O modules.

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CTI 2572-B Installation and Operation Guide
USAGE CONVENTIONS
NOTE:
Notes alert the user to special features or procedures.
CAUTION:
Cautions alert the user to procedures that could damage equipment.
WARNING:
Warnings alert the user to procedures that could damage equipment and endanger the user.

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CTI 2572-B Installation and Operation Guide
TABLE OF CONTENTS
CHAPTER 1. PRODUCT OVERVIEW ...........................................................................1
1.1. Introduction.............................................................................................................1
1.2. Compatibility ...........................................................................................................2
CHAPTER 2. INSTALLATION.......................................................................................3
2.1. Installation Planning................................................................................................3
2.2. Unpacking the Module ............................................................................................6
2.3. Setting the 2572-B Option Switches........................................................................6
2.4. Physical Installation.................................................................................................9
2.5. Connecting the Ethernet Cable ...............................................................................9
2.6. Initial Power On.......................................................................................................9
2.7. Entering the Module into the PLC I/O Configuration................................................9
2.8. Storing Network Parameters in Flash.....................................................................10
2.9. Module Checkout..................................................................................................11
CHAPTER 3. MODULE OPERATION.......................................................................... 13
3.1. Front Panel Features.............................................................................................13
3.2. Module Startup......................................................................................................14
3.3. Normal Operation..................................................................................................15
CHAPTER 4. CAMP SERVER..................................................................................... 17
4.1. Overview...............................................................................................................17
4.2. Operation..............................................................................................................17
4.3. Connections..........................................................................................................17
4.4. Error Processing ...................................................................................................17
CHAPTER 5. MODBUS TCP SERVER........................................................................ 19
5.1. Overview...............................................................................................................19
5.2. Variable Mapping..................................................................................................19
5.3. Address Translation ..............................................................................................19
5.4. Supported Modbus Function Codes (FC)..............................................................20
5.5. Modbus Exception Codes......................................................................................20
5.6. Diagnostic Statistics..............................................................................................20
CHAPTER 6. ETHERNET/IP SERVER........................................................................ 21
6.1. Overview...............................................................................................................21
6.2. Tag Types Supported............................................................................................22
6.3. 2572-B Configuration ............................................................................................22
6.4. Application Example..............................................................................................22
CHAPTER 7. PLC COMMAND INTERFACE OVERVIEW........................................... 27
7.1. Module WX/WY Words.........................................................................................27
7.2. Command Blocks..................................................................................................28
7.3. WX/WY Command Block Interaction.....................................................................29
CHAPTER 8. START NETWORK SERVICES COMMAND......................................... 31
CHAPTER 9. CAMP CLIENT COMMANDS ................................................................ 37
9.1. Overview...............................................................................................................37
9.2. CAMP IP Multicast Operation................................................................................37

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CTI 2572-B Installation and Operation Guide
9.3. Create Socket Command ......................................................................................38
9.4. Close Socket Command........................................................................................40
9.5. Memory Transfer Commands ................................................................................40
9.6. Application Examples............................................................................................48
CHAPTER 10. TROUBLESHOOTING ......................................................................... 59
10.1. Troubleshooting Aids...........................................................................................59
10.2. General Troubleshooting Techniques..................................................................60
10.3. Module Startup Problems....................................................................................60
10.4. Communications Problems .................................................................................62
10.5. Performance Problems........................................................................................63
10.6. PLC Logic Problems...........................................................................................64
10.7. Development and Debugging Tips ......................................................................65
CHAPTER 11. FIRMWARE UPDATE..........................................................................69
11.1. Overview.............................................................................................................69
11.2. Obtaining New Firmware .....................................................................................69
Updating 2572-B Firmware .......................................................................................... 69
APPENDIX A. ERROR CODES ................................................................................... 71
2572-B System Error Codes.........................................................................................71
General Memory Transfer Error Codes .........................................................................73
Start Network Services Error Codes..............................................................................78
CAMP Server Error Codes............................................................................................79
PLC CAMP Client Error Codes.....................................................................................81
APPENDIX B. PLC COMMAND INTERFACE.............................................................87
General Description......................................................................................................87
WX/WY Description .....................................................................................................89
Command Timing Diagrams.........................................................................................96
APPENDIX C. IP ADDRESS INFORMATION ...........................................................103
IP Address Nomenclature ..........................................................................................103
Using the Subnet Mask..............................................................................................104
Converting between CIDR and Dotted Decimal Notation.............................................106
Selecting an IP Address.............................................................................................106
Selecting a Multicast Address ....................................................................................107
HARDWARE SPECIFICATIONS................................................................................ 109
LIMITED PRODUCT WARRANTY.............................................................................110
REPAIR POLICY........................................................................................................112

CTI 2572-B / 2500C-2572-B Installation and Operation Manual 1
CHAPTER 1. PRODUCT OVERVIEW
1.1. Introduction
The 2572-B Ethernet TCP/IP module provides network services for CTI 2500 Series®
Classic controllers and Siemens SIMATIC 505® programmable logic controllers. The
2572-B module is designed to install in a CTI 2500 Series classic base or a Siemens
Series 505® base. Employing a new microprocessor and related components, the
2572-B module is a direct replacement for the 2572-A Ethernet TCP/IP module.
The 2500C-2572-B Ethernet TCP/IP module provides network services for CTI 2500
Series® Compact Controllers. The 2500C-2572-B module installs in a CTI 2500 Series
compact base.
Both modules are Special Function modules, which communicate with the PLC using
the SFIO (Special Function I/O) protocol. Network workstations and control devices
can use the services of these modules to read data from the PLC, write data to the
PLC, program the PLC, and exercise supervisory control over the PLC operation. In
addition, PLC logic can use the facilities of the CTI 2572-B and 2500C-2572-B
modules to access data in other CTI 2500 Series® controllers or Siemens SIMATIC
505® PLCs.
The modules support the following communications protocols:
•Camp Server: Allows a client to access PLC data and control PLC operation
using the CTI CAMP or the Siemens Task Code protocols.
•Modbus Server: Allows a client to access PLC data using the Modbus TCP
(Open Modbus) protocol.
•EtherNet/IP Server: Allows Allen Bradley Logix® controllers to read and
write PLC data stored in V memory.
•Camp Client: Allows the PLC to read and write data stored in V memory on other PLCs.
They connect to an Ethernet network via a CAT 5e RJ-45 connector. The network port supports
10Mb or 100Mb Ethernet data link (half or full duplex operation). The firmware includes a full
function TCP/IP stack that supports both TCP and UDP protocols.
The module provides extensive diagnostic facilities, accessible via an embedded web browser, to
aid in the detection and correction of network problems. In addition, the web browser can be
used to configure module operating parameters and to initiate firmware update.

CTI 2572-B / 2500C-2572-B Installation and Operation Manual 2
1.2. Compatibility
2572-B
The 2572-B mode is designed to be a direct application replacement for the CTI 2572-A module.
•The module uses the same PLC command interface as the CTI 2572 and 2572-A modules, allowing
existing PLC logic to control the operation of the module.
•The CAMP server is compatible with existing CAMP and task code drivers.
•The Modbus Server and EtherNet/IP server functionality is identical to the corresponding 2572-A
protocol managers.
Some features of the 2572-A module that are unrelated to the product application are not supported:
•The TFTP method used by the 2572-A module has been replaced by a method initiated by the
embedded web browser;
•The serial port, which provided an alternate means to set the IP parameters address on the 2572-A, is
not present;
•The Module ID switches, used to generate a DHCP client ID, are not present;
•The SYSLOG client capability is no longer supported.
2500C-2572-B
Except for the smaller form factor, the 2500C-2572-B module is functionally equivalent to the 2572-B module.
It uses the same command interface as the 2572, 2572-A, and 2572-B modules. Consequently, user logic
designed to control these modules will also work with the 2500C-2572-B module. HMI and SCADA workstation
drivers that can access data in CTI 2500 Series Classic controllers via the 2572-A or 2572-B also work with the
2500C-2572-B Module to access data in CTI 2500 Series Compact controllers.

CTI 2572-B / 2500C-2572-B Installation and Operation Manual 3
CHAPTER 2. INSTALLATION
The installation of the Model 2572-B Ethernet TCP/IP Adapter Module consists of the following steps:
1) Planning the installation,
2) Unpacking and configuring the module,
3) Physical installation,
4) Setting IP information,
5) Connecting cables,
6) Checking the module operation.
2.1. Installation Planning
Choosing Ethernet Media
The 2572-B module attaches directly to 10BaseT or 100Base TX media (Shielded or Unshielded Twisted Pair)
via the RJ-45 connector. Ensure that the cables you use for Ethernet communications meet the appropriate
IEEE 802.3 specifications and are appropriate for the environment in which you are operating. CTI
recommends you use cables rated Category 5e or better.
Selecting an IP Address and Other Network Parameters
Before proceeding, you must determine what IP address you will assign to the module, the subnet mask to
use, and the IP address of the default gateway/router. If you are connecting to an existing network, your
network administrator should provide this information. If you are installing a stand-alone network, you should
choose from within the set of “private” IP addresses specified in RFC 1597. See APPENDIX D. IP ADDRESS
INFORMATION for a description of the IP Address numbering conventions.
Choosing a Module Startup Method
Before the 2572-B will communicate using TCP/IP, the IP address and related parameters must be set and the
module network server must be started. There are two startup options, described below.
AutoStart
If you choose this method, the module will automatically start the network server using IP parameters stored
in flash memory. The primary advantage of this approach is that it eliminates the need for additional PLC logic
to initiate startup. See Section 2.8. Storing Network Parameters in Flash.
The disadvantage of this method is that, when installing or replacing modules, you must manually configure
the IP parameters of the replacement module. In addition, if you arbitrarily swap 2572-B modules between
PLCs, the IP address will move with the module. The effect of inadvertently swapping IP addresses could
cause process problems, since communications directed at one PLC would actually be going to another PLC.

CTI 2572-B / 2500C-2572-B Installation and Operation Manual 4
PLC Start
Using this method, PLC logic is used to set the IP address of the module during startup. The Start Network
Services command, triggered by PLC logic, sets the IP parameters based on data stored in V memory. Once the
IP parameters are successfully set, the network TCP/IP services are started
An important advantage to this method is that it eliminates the need to manually configure the module during
the initial installation or during a replacement operation. In addition, since the network parameters are stored
in PLC memory, the module IP address remains associated with the PLC even when modules are swapped. The
primary disadvantage is that it requires a small amount of additional ladder logic. In addition, if the PLC is not
in run mode (not executing logic) the module will not start up. The PLC logic to perform this function is
described in CHAPTER 8. START NETWORK SERVICES COMMAND.
Choosing between TCP and UDP Protocols
Many HMI drivers and OPC servers will allow you to select either TCP (Transmission Control Protocol) or UDP
(User Datagram Protocol) for delivering messages. The 2572-B client functions also allow you to choose
between the two. The following information is provided to help you determine which is right for your
situation.
UDP Protocol
The UDP protocol allows you to send a message to another node without previously establishing a logical
connection to the other node. This method, called connectionless delivery, uses less network bandwidth,
consumes fewer module resources, and usually results in faster response times. Although the delivery of UDP
messages is not acknowledged by TCP/IP, higher level protocols, such as CAMP, confirm that the message was
received and that the requested service performed.
NOTE:
In most installations, UDP is the preferred protocol for HMI applications that continuously read data
from the PLC.
TCP Protocol
The TCP protocol requires that a logical connection be established between two points before messages can
be sent. This method, called connection-oriented services, provides delivery acknowledgement and message
flow control within the TCP/IP protocol. If a message is not delivered correctly, the TCP protocol will cause the
message to be re-transmitted.
Although TCP may be slightly slower than UDP because additional acknowledgement messages must be
transmitted and evaluated, there are several instances in which it should be used:
1. If you have a network whose quality requires a significant amount of message re-transmission, TCP can
provide better overall performance because the TCP is quicker at delivery acknowledgement and retry
than the application level, which typically relies on a message timeout measured in seconds.
2. If you are using the Internet to access the module, you may want to consider TCP. When traversing the
Internet, some gateways may break a packet up into smaller chunks, a process called fragmentation. The
smaller packets may be sent via different paths and could arrive out of order. TCP will ensure that the
fragmented packets will be re-assembled in the correct order, while UDP will not.