🚀 go-pugleaf

In article <448e4l$d9e@gina.zfn.uni-bremen.de>, Juergen Sahlberg <sahlberg@fe.uni-bremen.de> writes:
> Dear Modula folks,
> 
> I remember an article sometime ago discussing the possibility of writing a
> Modula-2 library to develop IEC 1131-3 compliant code for PLCs. Being sometimes
> too fast with cleaning my disks, I lost that one :-(
> I think it came from somewhere over New Zealand.
> 
> Are there any (new) efforts and/or comments about this subject?
> -- 
> Greetings from Beck'sTown, Germany,
> 
> Juergen
> 
That was probably me...
 We were looking closely at supporting 1131 on our 80x51 Modula-2 compiler
( or a good portion of 1131 ), and as the structured Text portion of 1131 is
very similar to Modula-2, and a lot of our users are replacing PLC's with
80x51's it makes sense.
 The target we have is to add 1131 support where that does not conflict with
ISO Modula-2.
 We also keep the std at hand when writing libraries for Mod51, and if no 
other frameworks exist, we copy the 1131 semantics.
  For example, under Boolean syntax, the '_' as a formatting character has
been implemented. This can appear in numbers to align fields, and is ignored
by the parser. We also added a size snap check, so 111_0000B will produce
an error. This avoids typos in 8 or 16 bitfield style declarations.

 In a similar vein, we also plan to add ProfiBUS libraries to Mod51, but
we are waiting for Siemens data...
 - jim granville
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