Rockwell Automation 1799-D12G12GL 12 Input/12 Output Discrete Embedded I/O - Manual (Page 17)

17 12 Input/12 Output Discrete Embedded TTL I/O Module with Pulse Width Modulation and DeviceLogix
Publication 1799-IN008A-EN-P - July 2005
Inputs and Outputs Status Indicators
+5V dc Supply Power Indicator
Indication Status
None No power
Input or output point off
Yellow Input or output point on
Indication Status
Green 5V I/O power
None No power