Rockwell Automation 1791-IOBB USER MANUAL - Manual (Page 28)

Chapter
5
5Ć1
Troubleshooting
In this chapter you will learn about the LED indicators on the block I/O
module, and how to use them to troubleshoot the unit.
Each block I/O module has LED indicators (Figure 5.1) which provide
indication of module status. Each module has the following:
green communication indicator – indicates whether communication is
occurring between processor or scanner and the block.
red power indicator – indicates if power is applied to module and
internal hardware status
16 I/O status indicators (8 input–8 output or 10 input–6 output) – reflect
the state of the individual inputs and outputs (on or off)
Figure 5.1 shows the location of the indicators. Refer to Table 5.A for
status indications reported by the indicators.
Figure 5.1
Indicators on the Block I/O Module (1791-IOBA/B shown)
OUTPUT
INPUT
COMM POWER
Communication LED (green) Power LED (red) Status Indicators
10846-I
Chapter Objectives
LED Indicators