Control Technologies 2500-C CPU Series User manual

Tech Tip
SUMMARY
In order to use any CTI product with Ethernet
connectivity, you must first set its IP address. This Tech
Tip will provide simple instructions for setting IP
addresses for both initial use as well as replacement use
for the following products:
 2572-A
 2572-B
 2500P-ECC1
 2500P-ACP1
 2500-Cxxx CPU
More detailed instructions can also be found in the
respective user manuals for each of the products.
Before You Get Started
All of the above CTI Ethernet-connected products require
a fixed IP address. Before installing your module, you
need to determine its IP address. If you are connecting
to an existing network, you should obtain an unused
static IP address and the network subnet mask from the
network administrator. If you are establishing your own IP
addresses, you should select IP addresses from a block
of ‘private” addresses established by the
Internet Assigned Numbers Authority (IANA).
The private address blocks are:
• 10.0.0.0 through 10.255.255.255 (Class A)
• 172.16.0.0 through 172.31.255.255 (Class B)
• 192.168.0.0 through 192.168.255.255 (Class C)
These addresses will not be forwarded by the Internet
backbone routers; therefore, you are free to use any
address in this group as long as it does not conflict with
addresses already in use at your local facility.
Please note that some methods for setting IP addresses
described here require your PC to share the same
network address and subnet mask (but not host address)
as the module connected to it and that the ECC1 and
ACP1 (if using data cache or CAMP client) require that
your CPU/host controller have the same subnet mask
and network address as the module in order to function
properly. For a quick and easy way to differentiate
between network address and host address in most
situations, please see the following table:
For more information on IP addressing, please see
Appendix B of this Tech Tip.
Setting the IP Address on CTI Products

2
2572-A and 2572-B
For both the 2572-A and the 2572-B, you may choose to
manually set the IP address or you may choose to
set the IP address using the PLC. We generally
recommend using the PLC to set the IP address
even though it requires a bit of additional
programming in your PLC on the front end,
because it has the advantage of ensuring that any
future replacement modules will automatically
have the correct IP address. If you prefer to set
the IP address manually, you may use the
webserver or CTI Diag (2572-A only) to set
network parameters. Instructions for each of the
methods will be explained below.
In summary, your options for setting the IP
Address for either a 2572-A or 2572-B are:
1) Setting the IP address using the PLC program (PLC
START mode)
2) Setting the IP address manually using one of the
following methods (AUTOSTART mode):
 Use the Webserver
 Use CTIDiag (2572-A only)
Setting the IP Address from the PLC Program
Because setting the network parameters from the PLC
requires more knowledge and instruction than can be
contained in a tech tip covering multiple products, you will
need to follow the link below to a Tech Tip specific to
setting the IP Address using the PLC, or you may follow
the abbreviated instructions below that will require you to
consult your Installation and Operation Guide in order to
perform all necessary steps.
www.controltechnology.com/files/common-documents/tech
-tips/ethernet/Setting-IP-address-using-the-PLC-Tech-Tip-
FINAL
In General:
In order to use the PLC program to set the IP Address,
you must run your module in PLC START mode. SW4
must be in the Open position.
In the PLC START position, the module will wait for the
PLC START Network Server command before starting the
network services. This command block is what sets the IP
Address and other network parameters for the module.
Abbreviated Instructions:
1) Select an IP Address for your module
2) Log in the module to the base and read Appendix C of
the 2572-A Installation and Operation Guide or
Appendix B of the 2572-B Installation and Operation
Guide to understand how the module is controlled by
the PLC program and how it reports its status.
3) Using the information in Chapter 4 of the 2572-A
Installation and Operation Guide or Chapter 8 of the
2572-B Installation and Operation Guide, enter your
Start Network Server Command Block in V-memory
according to the instructions and follow the example to
enter rungs into your ladder to execute the command
block.
Please note that if you trigger the Start Network Server
command while the command block contains invalid data,
the module will return an error code and then halt. To
recover, you must correct the command block entry and
reset the module.
Setting the IP Address Manually
To manually set the IP parameters to correspond to your
networking requirements, you must choose the
AUTOSTART option using SW4. Be sure that SW4 is in
the Closed position.
1) Using the Webserver
To set the IP parameters using the embedded web server,
you must first ensure that your PC is on the same IP
subnet as the module. The default IP address for both the
2572-A and 2572-B is 169.254.1.1 and the default subnet
mask is 255.255.0.0, so your PC must have an IP address
that starts with 169.254 and does NOT end with 1.1 (For
example, an IP address of 169.254.1.2 would be
acceptable). The subnet mask for the PC must be the
same as the subnet mask for the 2572-A/B.
You can set a static IP address for your PC using Control
Panel (or Settings in Windows 10), or you may cause your
PC to generate its own compatible address, if DHCP
(Dynamic Host Configuration Protocol) is being used to
obtain its IP address.
To cause the PC to generate its own compatible address,
do the following:
1. Connect an Ethernet cable directly between your PC
and the 2572-A or 2572-B module
2. Reboot the PC
* Please also note that when using the PLC START option, the PLC must be in RUN mode before the module will start

3
When a Windows PC is unable to obtain an IP address
from DHCP, it automatically generates a link local
address using a feature called Automatic Private IP
Addressing. It may take several minutes before the PC
will stop trying to contact a DHCP server and generate a
Link Local address that is compatible to the IP address of
the module which is also a link local IP address.
Once the link local IP address is generated, or once you
have set a compatible static IP address for your PC, you
can connect to the module and change the network
parameters to meet your requirements.
1) Type the IP address of the module in your browser’s
URL box (unless the default IP address has been
changed, it should be http://169.254.1.1). Please
note that the IP address is displayed by the LED
display on the front panel of the 2572-B module after
power-up (the 2572-A does not have this feature). To
restart the 2572-B with the CTI factory default
address described above, you may hold down the
reset button for 10 seconds or more (this does not
work for the 2572-A).
2) From the list of pages on the left hand side of the web
page, select the Module Configuration page. The
graphic shown below is for the 2572-A, but the 2572-
B page has the same option on the left-hand side.
Unless you have bypassed password protection, you
will be asked for a User ID and Password. The
default User ID and default password are both config.
3) When the configuration page is displayed, enter the
new IP address information in the appropriate fields.
The 2572-A will ask for “Module IP Address” and
“Network Address Mask.” The 2572-B will ask for “IP
v4 Address” and “Subnet Mask.” Do not worry about
the “Default Gateway” at this time. It is an optional
setting that can be entered at a later time. Once your
desired values have been entered, press the Update
Module button for the 2572-A or the Apply button for
the 2572-B (as depicted above).
2) Use CTIDIAG (2572-A ONLY)
Another way to manually set network parameters on the
2572-A (this does not work for the 2572-B) is to use a
serially attached PC and a configuration program from CTI
called CTIDIAG. The CTIDIAG program used with the 2572
module will work in this application. It may be downloaded
from the CTI web site (www.controltechnology.com/
downloads).
1) Install CTIDIAG on your computer.
2) Connect the computer to the module serial port using a
serial cable wired for RS-232. The serial cable that you
use with your PLC programming software should work
properly.
3) Select the COM port and set the baud rate to
correspond to the selection you made for your module.
The default baud rate is 9600. Set the remaining port
parameters as follows: Parity = Odd, Data Bits = 7, and
Stop Bits = 1.
4) Under the Commands menu item select SET
NETWORK PARAMETERS.
5) Follow the instructions on the screen for setting the
network parameters.
6) Reset the module for the changes to take effect. The
module will restart using the parameters you just entered.

4
2500P-ECC1
In order to set an IP address on the 2500P-ECC1, you
must use the CTI 2500P-ECC1 Configuration Program
which can be downloaded from the CTI Web site. Once
the IP address has been configured using the program,
you will transfer the configuration files from your PC to
your ECC1 using an SD card.
The following procedure provides a quick means for
creating a configuration that loads an IP address to the
ECC1. It consists of the following steps:
1) Starting the configuration program
2) Entering the IP address and subnet mask of the ECC1
module. (You may also enter the IP address of the
Host Controller at this time if desired.)
3) Saving the configuration to an SD card and inserting
the SD card into the module
Starting the configuration program:
 After starting the configuration program, you should be
presented with a dialog box that asks you to Start a
New Project, Open an Existing Project, or Cancel.
 Select the “Start a New Project” option. If the dialog
box does not appear, select File/New from the menu
bar.
 Once you have created a new project, you will be
presented with the ECC1 Settings dialog box.
Entering the IP addresses:
 Under “ECC1 Network Settings” heading, enter the IP
address and the subnet mask for your ECC1 module.
Please remember that you must assign an IP address
and subnet mask to the ECC1 that is on the same IP
subnet as the Host Controller for which it will provide
communication services.
 Under the Host Controller Settings heading, enter the
IP address assigned to the Ethernet port of your CTI
2500 Series® controller. (OPTIONAL — This step can
also be completed at a later time.)
 When you have finished entering this information, click
on the OK button.
Saving the configuration to an SD card:
 Click on the Save to File option in the toolbar to name
and save the configuration project.
 Insert the SD card into your PC and click on the
Compile/Save to SD Card. If your PC does not have
an SD card slot, you will need to obtain a USB-to-SD
Card adapter. These adapters are widely available at
a nominal cost.
 After saving the configuration files to the SD card,
insert the card into the SD card receptacle on the
2500P-ECC1 module.
 New settings are detected on module power-up and
saved in non-volatile memory

5
2500P-ACP1
There are two methods to assign an initial IP address for
the 2500P-ACP1:
1) Modify the configuration file generated by the module
2) Offline configuration
METHOD 1: Modify the configuration file generated by
the module
 Insert the ACP1 module into the base.
 Apply AC power so that the ACP1 module executes
power-on reset.
 When Status LED starts blinking, remove ACP1
module from the base.
 Remove SD card from ACP1 and insert in PC card
reader.
 Open drive letter assigned to SD Card and navigate to
\acp1 folder
 Open ‘acp1.ini’ file with a text editor such as ‘Notepad’
and modify highlighted fields to match your network
settings. All other items can be configured via the Web
Server after the IP address is set.
 Save the modified file and return SD card to ACP1.
 Reinsert ACP1 module into base
 New settings are detected on module power-up and
saved in non-volatile memory
METHOD 2: Offline Configuration
 Remove SD card from ACP1 and insert in PC card
reader.
 Open a text editor such as ‘Notepad’ and copy/paste
the text in the box below. Modify the bolded values
(next to keywords) to the IP address you have
selected and to your network subnet mask. All other
items can be configured via the web server.
ACP1IPAddress="192.168.1.1"
ACP1SubnetMask="255.255.255.0"
ACP1DefaultGateway="0.0.0.0"
 Select ‘Save As’ option; then select drive letter
assigned to SD Card.
 Press ‘Create New Folder’ icon and rename ‘New
Folder’ as ‘acp1’.
 Enter file name as ‘\acp1\acp1.ini’ and press [Save].
 Remove SD card from PC and insert the card into the
SD card receptacle on the 2500P-ACP1 module
 Insert ACP1 module into base.
 New settings are detected on module power-up and
saved in non-volatile memory
To change an IP address, there is a third option: use the
web browser.
METHOD 3: Web Browser
This method can be used if the ACP1 already has an IP
address which is reachable from your PC.
 Connect to the web server from any computer with an
Ethernet connection to the module by entering the
module IP address into the navigation toolbar of any
web browser. (The PC will have to have the same
network and subnet mask addresses as the module.)
 Enter the desired module IP address, subnet mask,
and default gateway in the appropriate fields.
 Press [Submit] to save changes to the module
configuration.
 The module must be reset (or power cycled) to use
the new parameter values. If you changed the IP
address on your PC in order to connect to the ACP1,
you may now change it back.

6
2500-Cxxx Processor
To set an IP address for a 2500-Cxxx Processor, you may
either use the Serial or USB Port, or you may use the
Ethernet Port.
Using the Serial or USB Port
When connected to the serial or USB port, you can set the
IP address and other IP parameters using 505 Workshop
(V4.11 or greater) or using CPU_IPSET, a standalone
utility that you can download from the CTI web site.
To use 505 Workshop:
 Start Workshop and connect to the CPU
 In Workshop, select PLC Utilities and Configure TCP/
IP Address.
 In the dialog box, enter the IP address settings. Click
OK.
 The IP address of the CPU will change immediately.
To use CPU_IPSET:
 Download CPU_IPSET from the CTI website.
 Run CPU_IPSET. It will display the following dialog
box:
 Select your COM port and click Connect. CPU_IPSET
will display the current IP address settings of the CPU.
 Enter the changes you want and click Update.
Using the Ethernet Port
Firmware version 8.02 and above allows you to set the IP
address and other IP parameters when connected to the
Ethernet port. To enable this capability, SW11 must be set
to the closed position. You can change the parameters
using 505 Workshop (V4.11 or greater) or by accessing
the 2500 controller embedded web server with your PC
web browser.
To use 505 Workshop:
 Follow the same procedure as described above in
“Using the Serial or USB Port”
To use a web browser:
 Note the IP address and subnet mask address (in
CIDR format) presently being displayed on the front of
the CPU
 If needed, change the IP and subnet mask addresses
of your PC so that the PC is on the same IP subnet
as the CPU
 Launch your web browser
 In the URL box of the browser, type the IP address of
the CPU. The home page of the CPU will be
displayed.
 Click “Network Configuration” to display the IP
address configuration screen
 Enter your desired IP address settings and click
Update PLC.

7
APPENDIX A: CTI Ethernet Products IP Addressing Reference Chart
APPENDIX B: IP Addressing
Every host interface on a TCP/IP network is identified by a unique IP address. This address is used to uniquely identify
the host device, such as a workstation or communications module, and the network to which the host belongs. Each IP
address consists of 32 bits, divided into four 8 bit entities called octets. These octets are divided into a network portion
of the address and a host portion with the help of a subnet mask (more on this below). An IP address is expressed in
dotted notation, with each octet expressed as its decimal equivalent. The value in each octet ranges from 0 to 255
decimal or 00000000—11111111 binary. See the example below. What if I make font color white so you can’t s
Address Classes
IP Addresses are broken into different classes in order to accommodate networks of varying sizes. The network class
can be discerned from the first octet of its IP address. The following table lists the three most common IP address
classes along with the default subnet mask for each class and the total number of Network IDs and Host IDs for each
address class. It also indicates which portion of its address is for network versus the portion used by network managers
to divide into subnets and hosts.
* Address 127 is reserved for loopback testing and inter-process communication on the local computer; it is not a valid network address. Addresses
224 – 239 are used for Class D (IP multicast). Class E (240 - 255) are reserved for future use.
Subnet Mask
Used alone, the designation of network classes is very inflexible. For example, a Class A network assigns a large
number of host devices to the same IP network; potentially reducing performance, limiting topology, and compromising
network security. An additional entity, the Subnet Mask, provides means of dividing a large IP network into a collection of
smaller networks called subnets.
Copyright© 2017 Control Technology, Inc. All Rights Reserved 24AUG2017
* CTI 2500-Cxxx CPUs ship with no network parameters. When you connect the Ethernet port to a switch or PC, the controller will automatically generate a temporary Link
Local IP address. ** If using data cache or CAMP client for ACP1 to communicate to CPU, both CPU and ACP1 must have same network and subnet mask addresses.

8
The Subnet Mask is a collection of 32 bits that distinguish the network ID portion of the IP address from the host ID. Like
the IP Address, the resulting 32-bit value is expressed in dotted decimal notation. In binary form, however, it is easy to
identify the network and host IDs: any bits which have corresponding mask bits set to 1 represent the network, and any
address bits that have corresponding mask bits set to 0 represent the host ID. Or in decimal form, the octets of the IP
address where the corresponding octet of the subnet mask is 255 belong to the Network ID and the octets of the IP
address where the corresponding octet of the subnet mask is 0 belong to the Host ID.
For example: when the IP address is 172.54.177.97 and the subnet mask is 255.255.255.0, the Network ID is
172.54.177 and the Host ID is 97. If your subnet mask does not align with octet boundaries (for instance,
255.255.240.0), you will need to consult one of our user manuals for help in performing a bitwise “and” calculation (see
the User Manual for the 2500P-ECC1) in order to determine the network and host IDs.
Final Reminder
When you are configuring the IP address of devices that must communicate on a local network, you must ensure that:
• The Subnet Mask of all devices are the same,
• The Network ID of all hosts are the same,
• The Host ID of each host is different.
APPENDIX C: Using the Product Display to Determine
the IP Address and Subnet Mask
CTI products with front panel displays (2500-Cxxx processors,
2572-B, 2500P-ECC1, 2500P-ACP1) running recent firmware
versions display the IP address in dotted decimal format followed
by the subnet mask in CIDR format. The CIDR format is an
alternate, more recent means of specifying the mask which simply
designates the number of network ID bits.
See the conversion table to the right.
For Additional Help
Please do not hesitate to contact us if we can be of further
assistance. You can reach our technical support line at
+1.865.584.0440 or email us at [e-mail].
We stand ready to assist you and appreciate your business.
Copyright© 2015 Control Technology, Inc. All Rights Reserved 7OCT2015
Copyright© 2017 Control Technology, Inc.
All Rights Reserved
CONTROL TECHNOLOGY, INC.
5734 Middlebrook Pike
Knoxville, TN 37921 USA
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