User`s guide

Page 8

Controlinc 1746-C (Version 5.21) Network Master Users Guide (2004-11-18)

2.2. LED Utilization

2.2.1. Green (PRT1 & PRT2) and Yellow (LED1 & LED2) LED Usage

There are 2 “Yellow” LED lights on the front of the 1746-C module

• LED1.

• LED2.

There are currently 3 general functions operating these LEDs:

1. After CPU restart, both LED1 & LED2 are ON until the 1746-C finishes initialization and starts

polling the network.

2. After initialization, LED1 is used as a “starting a new scan” indicator by toggling on/off at the

start of each scan. Ex: Starting scan 1: LED1 is ON.

Starting scan 2: LED1 toggles to the OFF state.

Starting scan 3: LED1 toggles to the ON state.

3. After initialization, LED2 is used as an “entire network is down” indicator. If the 1746-C ever

detects zero (0) actuators on the network, it will turn LED2 on and immediately enter a

diagnostic scan and remain there until an actuator is found to be on-line and communicating.

There are 2 communication LED lights (green LED lights) on the 1746-C module:

• PRT1: Port 1 Transmit … lights up when transmissions are going out port 1.

• PRT2: Port 2 Transmit … lights up when transmissions are going out port 2.