The 2500-RIO-A RS485 Remote Base Controller allows control of a remotely-located
CTI 2500 Series® or Simatic® 505 I/O base over a twisted-pair RS485 cable up to
1000m from the CPU. IMPORTANT NOTE: 2500-RIO-A HAS BEEN MATURED.
IT IS REPLACED BY 2500-RIO-B, WHICH SHOULD BE USED ON ALL NEW DESIGNS.

Features
• Replaces Siemens® 505-6851-A and 505-6851-B with no rewiring
• Can be used in all currently available CTI and Siemens® 4. 8. 11.and 16-slot bases
• Works in 2500-R11-A and 505-6511 redundant bases to provide RBC redundancy
• Up to 15 remote bases can be attached to a CPU
• Maximum cable distance between CPU and remote base is 1000m
Files & Documents
• Product Maturity Announcement
• Product Bulletin
Introduction
The CTI 2500-RIO-A RS485 Remote Base Controller is a member of Control
Technology's family of I/O modules compatible with programmable controllers
from Siemens® and CTI.
The 2500-RIO-A RS485 Remote Base Controller (RBC) allows a 2500 Series™
I/O base to function as a remote base. The 2500-RIO-A is intended to be a
replacement for the Siemens® 505-6851-A RBC. It provides the following
functions:
• Compatible with CTI 2500 Series™ and Simatic® 505® CPUs.
• Can be used in currently-available CTI and Siemens® 4. 8. 11. and 16-slot
bases
• Supports communication speeds 1Mbits/sec and maximum cable distance
of 1000 meters
• LED display which shows error and status codes
• Front panel thumbwheel switch for setting the station address
• On-board RS232 port which can be used for PLC programming and
configuration.
The 2500-RIO-A resides in 2500 Series™ base. It installs in the second slot
from the left, adjacent to the power supply module. When used in a
2500-R11-A Redundant Base, two 2500-RIO-A units can be installed
in the third and fourth slots from the left, adjacent to the second power
supply.
Do not install this module into a normal I/O slot, as damage can occur.
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