Rockwell Automation 1747-SN Remote I/O Scanner - Manual (Page 42)

Publication 1747-UM013B-EN-P - January 2005
3-8 Installation and Wiring
2. Make sure you have configured your SLC processor and
downloaded an application program. (Refer to chapter 4.)
3. Make sure power is applied to all devices on the RIO link.
Scanner Operation Below is a description of the scanner’s operation at power up, run
mode, and when changing from run mode to program or test mode.
At Power Up
At power up, the scanner’s communication LED (green LED) is off
until the SLC is changed to Run or Test mode.
In Run Mode
During normal scanner operation (SLC in Run mode), the scanner’s
LEDs illuminate as shown below:
When Changing From Run Mode
When the SLC processor is changed from Run mode, to Program or
Test mode the following occurs:
• scanner’s COMM LED remains green.
• the scanner continues to read its input devices and send output
data to its RIO adapters.
• the scanner instructs adapters to either clear all outputs or hold
them in their last state (depending on their configuration). Refer
to the user manual included with each RIO device for specific
information relating to the Hold Last State setting.
FAULT LED is off.
COMM LED is green.
SCANNER
FAULT COMM