Prosoft-technology 3170-MBS Manuel d'utilisateur télécharger pdf (Page 30)

Diagnostics and Troubleshooting 3170-MBS ♦ Flex Platform

User Manual Modbus Slave Interface Module

Page 30 of 55 ProSoft Technology, Inc.

October 27, 2010

6.1 LED Indicators

The following explains the operation of the LEDs.

LED Color Status Indication

Power Green On

Normal state: The module is operating normally, with

communications being detected on the link

Blink

Modbus Communication Timeout: The port has not detected any

communications on the link for over 1 second. If the HOLD LAST

STATE dip switch is not set, the Input and Output images will be

forced to zero(0).

FLEX Backplane Communications Fail: The communication

adapter either does not detect any I/O modules plugged into the

backplane, or the backplane communications have failed.

Transmit Green Blink The Modbus port is transmitting data.

Receive Green Blink The Modbus port is receiving data. LED flashes on any character

activity, valid or invalid.

COM

ERR

Amber Off

Normal State: When the error LED is off and the related port is

actively transferring data, there are no communication errors

Blink Periodic communication errors are occurring during data

communications. Error conditions that cause LED to blink include:

 Bad Function Code

 Invalid Register Address in command

 Invalid Count value in command

 Insufficient Characters in Modbus Packet

 Checksum Error detected in packet

FLEX Backplane Communications Fail: The communication

adapter either does not detect any I/O modules plugged into the

backplane, or the backplane communications have failed

On This LED will stay on under several conditions:

Configuration Error

Recurring communication error

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Prosoft-technology 3170-MBS Manuel d'utilisateur Page 30