IAC communication time out with message:degraded sequence number diff

Gents,

Anyone know what causes the following message on controller log:

IACInVariable::VerifySequenceNumber First Fault - degraded sequence number diff: 7200

This message occured when timeout on external IAC variable (between controllers).

This IAC consist of only 7 bools (simple data type).

The setting of the IN communication variables is as follow:

Unique ID: 180210101 and is unique on the entired network,

IP address: 172.16.80.180 i.e. source controller's IP

ISP values: mixture of true and false

Attribute: retain hidden,

Interval time: normal,

Expected SIL: same (between safety controller PM865)

Acknowledgement group: auto

Parameter on IAC MMS setting:

Interval time normal: 2000ms

Timeout normal: 6000ms

Application interval time (task time) containing the source variables is 900ms

System version:800xA Base S-FP 5.1.4-2 ver5.10.5632.29860

Please help!

JD_Ang Rank: 1239

Asked 10 months ago

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Answers

A download to the IAC server gives the message "degraded sequence...."

Rolf N Rank: 121

Answered 9 months ago