Year: 2026

PAC Performance, PLC Usability

The 2500 Series® Classic Programmable Automation Control (PAC) system is a powerful,

flexible, multi application controls system with unmatched reliability and ease of use.

Its modular design and robust process control capability including built-in communications ports

and considerable I/O capacity deliver PAC performance, while its operational simplicity and

ease of use provide PLC-like usability.

For machine control or for small- to large-scale processcontrol, the CTI 2500 Series®

Classic PAC System offers:

 Full-featured performance supporting up to 8192 I/O points*, including both digital and analog I/O,

and hundreds of PID loops and alarms.

 Advanced functionality

 Multiple remote I/O network options

 Easy connection to other 2500 Series® products as well as to many other manufacturers’ products

Features

• Replaces Siemens® 505-6870

• Compatible with CTI 2500 Series, Simatic® 505. Siemens® S5® and S7®, as well as other

Profibus masters

• Can be used in all 4. 8. and 16 slot CTI and Siemens® bases

• Supports communication speeds from 9600 baud (max cable distance per segment: 1200m)

up to 12 Mbaud (max cable distance per segment: 100m)

• Supports all CTI and Siemens® discrete and analog I/O modules

• GSD file is provided with the RBC to allow configuration by WORKSHOP or COMPROFI

• LED display for error codes and station address

The 2500-RBC Profibus Remote Base Controller (RBC) allows a CTI 2500 Series® or

Simatic® 505 I/O base to function as a slave node on a Profibus DP I/O channel

that complies with the PROFIBUS standard.  The Remote Base Controller

is intended to be a replacement for the Siemens® 505-6870 RBC.

The 2500 Series® Classic Programmable Automation Control System is designed 

for use in a broad range of applications, including those that require both discrete

and analog control.  2500 Series® products can be found worldwide in numerous

industries, including food and beverage, oil and gas, air separation, pulp and paper,

mining and foundry, building products, printing equipment, chemicals, pharmaceuticals,

semiconductor, and wastewater/water treatment. CTI designed the 2500 Series®

with a focus on operational simplicity, ease of use, and compatibility across successive

product generations to deliver unsurpassed reliability and the performance you

need at the lowest total cost.

The most important feature of every product CTI sells is compatibility

— both backward and forward.  We don’t obsolete our products and expect customers

to buy our latest control system.  Instead, our products are conceived to allow customers

to improve systems incrementally — building on previous investments in equipment,

programming and training.  A brand new controller with modern features will work

seamlessly with I/O modules from ten years ago or from ten years hence. 

This allows you to upgrade your control system at your own pace and with

minimal disruption.

Description

The 2500-RBC Profibus Remote Base Controller (RBC) allows a CTI 2500 Series® or

Simatic® 505 I/O base to function as a slave node on a Profibus DP I/O channel

that complies with the PROFIBUS standard.  The Remote Base Controller

is intended to be a replacement for the Siemens® 505-6870 RBC.

Specifications

Ports:

Profibus 9-pin female, pins 2.7 no connect

Profibus Baud Rates:

9600. 19.2K, 93.75K, 187.5K, 1.5M, 3.0M, 6.0M, 12M

Profibus Port Isolation:  1500VDC

Output State Selection:

Determines state of outputs when I/O channel

communication is lost:

off  all outputs are turned off

freeze all outputs hold their last value

Dipswitch Options:

Serial port baud rate (future use)

RBC station address

Status display mode

Software-Set Parameters:

Discrete I/O interval

Word I/O update factor

Ignore mismatch mode

RS232 port enable/disable

Diagnostic Data:

Station status (3 bytes)

Master address (1 byte)

Ident number (1 byte)

Extended diagnostics (9 bytes)

Backplane Power:  2 Watts (maximum)

Module Size:  Double-wide

Shipping Weight:  1.5 lb. (0.68 Kg)

Additional Product Information:

On CTI’s Website you will find links to the 2500 Series Std Environmental 

Specifications and the UL Agency Certificates of Compliance.