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Installation

Chapter 3

3-18

There are 6 LED indicators on the front of a KF2 module (Figure 3.10).

These indicators can help you in diagnosing problems with the module’s

installation and operation. The indicators are:

PWR - Power On

XMTG - Transmitting

RCVG - Receiving

RDY - Ready to Transmit

ACTV - Active

CPU - Module Fault, or DLE NAK Indicator

Figure 3.10

Diagnostic

(LED) Indicators

XMTG RCVG RDY ACTV CPUPWR

ALLEN–BRADLEY

DATA HIGHWAY

COMMUNICATION INTERFACE

The XMTG light comes on when the KF2 module is current master of the

network link and is transmitting a command or reply message.

The RCVG light comes on when the module is receiving a command or

reply message from another station on the network link.

If the KF2 is on the Data Highway and the XMTG and RCVG lights are

on at the same time, this indicates that the module is current master of the

Data Highway and is polling the other stations to transfer mastership.

If the KF2 is on a PCL link and the XMTG and RCVG lights are on at the

same time, this means that the module is determining whether there is a

new module trying to access the link. This is known as “soliciting a

successor.”

The RDY light comes on when the module has a message stored in its

transmit buffer and it is waiting to acquire mastership of the network link

so it can transmit the message.

Diagnostic Indicators

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Plus RS-232 Manuel d'utilisateur Page 42