Communication Variable in SIL Application

Hi dear

I have 2 controller. Controller_1 is PM864 that run DCS and Controller_2 is PM865 that run ESD. Our code write in Function diagram.

In ESD Application we have one diagram (SIL3) that declare communication Variable with IN direction, Expected SIL is same and UniqueID is set.

In DCS Application we have one diagram (Non-SIL) that declare communication Variable with OUT direction and without UniqueID beacause in Non-SIL App not needed.

Now after download we haven't data connection between ESD and DCS.

Status in ESD is 16#20020

Status in DCS is 16#C0

According to safety manual we need change Control Builder Compiler switch from error to warning. But it is not recommended. After change compiler switch we see warning on diagram and it is very undesirable. and for each download we need confirm that.

If I use MMSDefHI and MMSReadHI, I have problem again?

Please explain me if you have any solution for this problem.

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asked 9 months ago



Sorry, but the problem description is not that clear. You get necessary warnings as desired. Then, how you can avoid that! IAC is a light communication framework as compared to using MMSCommLib, but there is no problem if user wants to use MMSDef/MMSRead modules.


answered 9 months ago


By akokhaledi on 8/14/2017 | Like (0) | Report

Hi Skhpatnaik
I use IAC communication now.
but in simulator is ok. but in real controller communication by IAC isn't ok. if we want to communicate DCS and ESD, we must change Expected SIL to non-SIL in ESD communication variable. and change project compiler switch.

By skhpatnaik on 8/16/2017 | Like (0) | Report

Yes, thats true. As your Communication server is NonSIL, you must change the Expected SIL field in communication variable section must be 'NonSIL', can't be 'same' as the server is not of same SIL level.
Now as you are communicating from lower to higher SIL, you need to change the corresponding compiler switch setting.
Please Note here, this setting is for lower SIL level to SIL even if you have communication from SIL2 to SIL3, you need to change the corresponding compiler switch setting.

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FD code block in a diagram is the only code block in Control Builder that supports a lower SIL signal input. Communication is displayed in yellow on editor and the expected SIL value is also displayed as a label below the object.

To enter Unique ID in NON SIL diagram Select Tools -> Show SIL IAC Attribute and enter IAC variable unique ID. To use NON SIL communication variables in SIL application enable NON-SIL communication variables in SIL1-3 application in CBM compiler switch option.

IAC error codes can be decoded using table mention in 3BSE035980-600_A_en_System_800xA_Control_6.0_AC_800M_Configuration.pd
f -> Section 4 Online Functions -> UnderStanding the complete Status Code.


answered 9 months ago


By akokhaledi on 8/15/2017 | Like (0) | Report

Thank you dear
We use IAC communication in DCS and ESD. My question is
1- its mandatory change NON-SIL communication variables in SIL1-3 application in CBM compiler switch from error to warning?
2- I don't want show warning on diagram. is it possible?
3- If we config SIL3 for communication variable in ESD and DCS diagram we have warning again?

By jobinissac on 8/15/2017 | Like (0) | Report

1. Since IAC from NON SIL to SIL, compiler switch should be changed in CBM.
2. Its not possible. Because it is configured to allow IAC with warning.
3. Yes. If you are trying from NON SIL to SIL.

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