Specifications

Bulletin No. VVDED397044US R12/00 Section 1—Installation & Configuration

December 2000 Diagnostics

DIAGNOSTICS

The MODBUS PLUS option card has one LED that indicates the status

of the communication link.

Figure 26: LED Location

Table 9: LED States

State of LED Meaning

Off

Card Disabled: Switch 7 is in ON state

ILF Fault: A communication problem exitst between the

communication option card and the drive controller.

1 flash per second

Monitor Link: On powering up or after exit from “4 flashes

per second” mode, the card monitors the network and

constructs a table of nodes which are active and hold a

token. At the end of 5 seconds, the card attempts to switch

to normal operating status (indicated by 6 flashes per

second).

6 flashes per second

Token OK: The token is circulating normally and the card

is receiving it once per rotation.

2 flashes per second followed

by a pause of 2 seconds

Never Getting Token: The token is passing via other

nodes, but the card never receives it.

3 flashes per second followed

by a pause of 1.7 seconds

Sole Station: The network only contains one node or the

link has been lost.

4 flashes per second followed

by a pause of 1.4 seconds

Duplicate Station: Another node is using the card address.

The card is waiting for reconfiguration or for the other node

to be disconnected from the network.

LED

Address Switches

Connector