Re: [foxboro] Question about OR usage in CALC function block logic
- From: "Wilson, Brad" <brad.wilson@xxxxxxxxxxxx>
- To: "foxboro@xxxxxxxxxxxxx" <foxboro@xxxxxxxxxxxxx>
- Date: Wed, 8 Aug 2012 03:20:32 -0400
Any non-zero value to a BI is interpreted as TRUE (1).
The OR operator will return TRUE is ANY of the values is TRUE.
The AND operator will return TRUE only if ALL the values are TRUE.
The XOR operator will return TRUE if there are an ODD number of TRUE inputs.
The logical not operations (NAND, NOR, NXOR) will simply return the opposite of
what the normal function would.
And of course, the packed operators (___X) will perform the selected functions
on a bit-by-bit basis.
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On
Behalf Of Hicks, David
Sent: Wednesday, August 08, 2012 10:43 AM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] Question about OR usage in CALC function block logic
As far as I know the "OR" function is a Boolean instruction and only recognizes
a 0 or 1. Anything other than a 1 in RI01 location will result in BO01=FALSE
according to the conditions that you have provided.
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On
Behalf Of Quay B. Finefrock
Sent: Tuesday, August 07, 2012 7:25 PM
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro] Question about OR usage in CALC function block logic
Good day ladies and gents,
What happens in a CALC function block when an OR function is used with a
stack that includes a real value. For example, what is written out to BO01
in the following case?
IN BI01; = False
IN RI01; = 13.0
IN BI02; = False
IN BI03; = False
OR;
OUT BO01 = ?
Does this produce an error? Does the result depend on the value of RI01?
I am reverse-engineering some old I/A logic and I do not have access to a
simulator to test and see what will happen in this situation. Can someone
please help me out?
Regards,
Quay
--
Quay B. Finefrock
PSD Controls Pte. Ltd.
Phone: +65 9327 2923 (Singapore)
+673 883 1480 (Brunei)
+60 17 820 6900 (Malaysia)
Email: Quay@xxxxxxxxxxxxxxxx
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addressed. This e-mail is confidential and may well also be legally privileged.
If you have received it in error, you are on notice of its status. Please
notify the sender immediately by reply e-mail and then delete this message from
your system. Please do not copy it or use it for any purposes, or disclose its
contents to any other person. This email comes from a division of the Invensys
Group, owned by Invensys plc, which is a company registered in England and
Wales with its registered office at 3rd Floor, 40 Grosvenor Place, London, SW1X
7AW (Registered number 166023). For a list of European legal entities within
the Invensys Group, please go to http://www.invensys.com/en/legal/default.aspx.
You may contact Invensys plc on +44 (0)20 3155 1200 or e-mail
reception@xxxxxxxxxxxxx This e-mail and any attachments thereto may be subject
to the terms of any agreements between Invensys (and/or its subsidiaries and
affiliates) and the recipient (and/or its subsidiaries and affiliates).
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Systems (formerly The Foxboro Company). Use the info you obtain here at
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