Chapter 2 - configure scanner mode, Introduction, Chapter 2 – Rockwell Automation 1756-RIO ControlLogix Remote I/O Communication Interface Module User Manual User Manual
Page 37: Configure scanner mode, Rs 2, Chapter
37
Publication 1756-UM534B-EN-P - November 2010
37
Chapter
2
Configure Scanner Mode
Introduction
Once the 56RioCfg configuration tool launches, you can configure a Remote
I/O network using the RIO module as a scanner, or an adapter. This chapter
describes how to configure the module for use in scanner mode.
In scanner mode, the ControlLogix controller writes remote I/O outputs and
reads remote I/O inputs. The 1756-RIO module enables communication
between the controller and devices on a Remote I/O network. The scanner
continuously scans the adapters on the Remote I/O network.
Two types of data are transferred over the Remote I/O network - discrete and
block transfer data. Discrete data transfers consist of the scanner sending
output data and communication commands to the adapter, which instruct the
adapter about how to control its output. The adapter responds by sending
input data to the scanner.
The remote I/O block transfer module is a data transfer mechanism that lets
you control the transfer of up to 64 words of data to or from a remote device.
The 1756-RIO module allows the user to offload block transfer execution
from the controller. The data appears in the data table of the ControlLogix
controller without having to execute the logic in the controller to perform the
block transfer. A Block Transfer Read (BTR) receives data from a remote
device. A Block Transfer Write (BTW) sends data to a remote device.
In this chapter, you use the configuration tool to configure the module in
scanner mode to prepare it for use on the Remote I/O network. You will:
• configure the racks automatically, or manually.
• add and configure block transfer modules.
• map the remote I/O modules to the ControlLogix controller produced/
consumed data.
Topic
Page