Rockwell Automation 1791-I0VW USER MANUAL - Manual (Page 33)

Chapter
4
4-1
Troubleshooting
In this chapter you will learn about the 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 4.1) which provide
indication of specific functions. Each module has the following:
Status Indicators - Indicators are provided for power, active,
communication and fuse blown indications. An LED array provides
input/output status.
POWER indicator -
- green -on continuously if customer voltage is present;
off if power is not applied or there is an internal power supply
problem.
ACTIVE indicator -
- red if the CPU is not running;
green if the CPU is operating correctly.
COMM indicator - indicates the status of the remote I/O link.
- green when communication is correctly established;
off when communication is not established;
flashing when programmable controller is in PROG mode.
FUSE indicator - indicates the status of the 2 output fuses.
- off if both fuses are intact;
red if either fuse opens.
The I/O status array is an 8 by 8 array of 64 LEDs capable of displaying
the status of 32 inputs and 32 outputs at any one time.
Refer to Table 4.A below for status indications reported by the LED
indicators.
Chapter Objectives
Indicators