Re: [foxboro] External Reference for Compound:Block.Parameter.Extension in HLBL?
- From: "Johnson, Alex" <alexander.johnson@xxxxxxxxxxxxxxxxxxxxxx>
- To: "foxboro@xxxxxxxxxxxxx" <foxboro@xxxxxxxxxxxxx>
- Date: Thu, 15 Jan 2015 15:04:57 -0600
Re: Using bit extensions in HLBL
An HLBL external reference must have this syntax:
<HLBL Variable> := C.B.P[.qualifier];
or
<HLBL Variable> := SV;
As you can see, the assignment must have a CBP or SV on the right of the
assignment operation. The only variation is that there are three specific
qualifiers that allow the user to extract information from the status word of
the CBP. These qualifiers are: .BAD, .OOS, and something I don't remember
off-hand.
Many users believe that the bit extensions used in peer-to-peer communications
are available everywhere and that's not the case. That belief is incorrect. The
extensions are not a feature of the OM name. Rather, they are a configuration
convenience on peer-to-peer connections only. FoxView does not support them and
neither does HLBL.
When the CP's Block Processor (BP) encounters a bit extension, the BP extracts
the appropriate information and places it into the input of the control block.
However, the HLBL compiler was not extended to support the bit extensions. It
supports only the original ones that give access to the CBP's OM status bits.
To help with your challenge, you have two choices:
1) Use a block connection (INxxxx, BIxxxx, etc) with the bit extension and
access it from within the HLBL code. That works.
2) Write bit extraction logic in CBP of interest in the block's HLBL code. That
works, too, but it's cumbersome.
Hope this helps.
AJ
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Alex Johnson | Schneider Electric | Invensys | United States | System
Architect, Next Generation Systems
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-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On
Behalf Of Neufeld, Brahm
Sent: Thursday, January 15, 2015 2:34 PM
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro] External Reference for Compound:Block.Parameter.Extension in
HLBL?
All-knowing list,
I have FCS 5.0 (Archestra IDE) and I would like to do some logic with more than
24 boolean inputs (valve & motor statuses).
I cannot seem to figure out how to use COMPOUND:BLOCK.PARAM.EXT in HLBL,
specifically the IND block.
For instance, I can define a bool under VARIABLES:
BOOL_VAR : B;
And assign an external reference to it in my STATEMENTS:
The block compiles with this syntax, but IDE shows the block with OP_ERR="-60",
which B0400DF describes "param does not exist... the full pathname refers to a
block that exists in the control database, but the parameter with given name
does not exist in the block". The IND block is held in manual and doesn't do
anything.
Other familiar IDE syntax like "COMPND.PAKIN_BLK.PAKCIN#B4" refuses to compile.
Any thoughts?
Thanks,
Brahm Neufeld
Process Control Engineer
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