IAC communication time out with message:degraded sequence number diff
May I 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
Thank you so much for your time!
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