Rockwell-automation 1336T ControlNet Frn1.02 Rev 1.5 User Manual download pdf (Page 196)

7–8 Troubleshooting

Publication 1336 FORCE–5.18 ––March, 1999

Parameters Relating to Communication Loss – Each drive has two

parameters that define how the communications losses get handled. These

parameters are called “ICN Fault Select” and “ICN Warning Select”. In the

1336T, these are parameters 425 and 426. Operation of bits within these

parameters is essentially identical to similar parameters used for RIO/DH+

adapters which exist at these parameter numbers. Bit positions are identical

for all of these parameters in a ControlNet Adapter as detailed in the

following table:

Bit Position Description

0 Reset/Program/Test

1 Last State

2 ICN Comm Loss

3 Class 1 Close

4 Class 3 Close

5 Class 1 Timeout

6 Class 3 Timeout

If any bit is set to one in the Fault Select word, then if the corresponding

event occurs, the drive will Soft Fault, and thus not be running. If the fault

was one that causes loss of I/O image to be received (0,2,3,5) then the Last

State bit is used to define what should be done to the entire Input Image (all 8

words). If Last State is a one, the input image is left in the last state prior to

the fault being detected. If Last State is a zero, then the 8 input words are all

set to zero.

The Warning Select parameter is used to determine if any event not specified

to be handled as a fault in the Fault Select word should be treated as a

warning. If a bit is set to a one, then a warning annunciation will occur for

the corresponding event, but only if the corresponding bit in the Fault Select

word is a zero. If any of the events that cause loss of I/O data occur (0,2,3,5)

and that event is being annunciated as a warning, then the Last State bit in

the Warning Select word is used to determine the state of the Input image.

This works identically to the Last State bit for events being handled as faults.

If any bit position is set to zero for both the Fault Select word and the

Warning Select word, then the event corresponding to that bit is ignored (not

annunciated as either a fault or a warning). The Warning Select’s Last State

bit is applied to the I/O image for the following events

ICN Comm Loss

Class 1 Close

Class 1 Timeout

The case of a Reset/Program/Test event occurring, but set set to be ignored

will always result in the I/O image being left in the last state (not zeroed even

if Warning Select’s Last State bit is zero). This is consistent with the

operation of the existing RIO adapters.

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