CTI 2500-RIO-B Installation and Operation Guide V1.4
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CHAPTER 2. INSTALLATION
The installation of the Model 2500-RIO-B RS485 Remote Base Controller consists of the following
steps:
1) Planning the installation
2) Verifying power requirements
3) Unpacking and configuring the module
4) Physical installation
5) Connecting cables
6) Checking the module operation
2.1. Installation Planning
Choosing Remote I/O Media
The 2500-RIO-B attaches directly to the RS485 Remote I/O cable using a DB9 connector. We
recommend using cable designed specifically for RS485 systems, such as Belden 3105A. See
Appendix A for information related to cable specifications, layout, and installation.
Selecting a Remote Base Address
Before proceeding, you must determine what address you will assign to the RBC. Remote Base
addresses range from 1 to 15. In CTI 2500 Series® and Simatic® 505® systems, address 0 is
reserved for the local base where the CPU is installed. Note that each Remote Base on the Remote
I/O channel must have a unique address. If two RBCs are installed in a 2500-R11-A Redundant
Base, they must both be set to the same address.
Setting Module Hardware Options
The RBC includes a hardware setting for selecting the state of the base discrete outputs in the event
of a loss of communication with the CPU. The module can be configured to set all outputs off, or to
leave outputs at their last states. If two RBCs are installed in a 2500-R11-A Redundant Base, they
must both have the same configuration.
Connecting to Remote I/O Cable
The Remote I/O connector should be wired as shown in Section 2.7.
2.2. Power Requirements
The CTI 2500-RIO-B module consumes 2.5 watts of +5 VDC power from the backplane. Before
installing the RBC, verify that your mounting base power budget can accommodate the required
power. A good tool for performing the verification is the CTI Replacement Guide and Power
Calculator, available from our website at
