I would like to than y'all for showing me the ways to trouble shoot & test my
SEQUENCE block problem and the users doc. The problem turned out to be a
syntax error which was caused by an extra ":" in front of the CB name passing
to the subroutine. As a result, the runtime error was generated due to
unresolved CB name. I will definitely add exception handlers in my sequence
codes as recommended by Dirk.
Thanks for your help and have a happy Thanksgiving.
Daniel
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx <foxboro-bounce@xxxxxxxxxxxxx> On Behalf Of
Theobald, Martin (Overton)
Sent: Wednesday, November 17, 2021 3:20 AM
To: foxboro@xxxxxxxxxxxxx
Subject: [EXTERNAL] Re: [foxboro] Debugging Sequence Codes
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Daniel,
Depending upon the block type, you may want to see if parameters such as the
following can help you identify the cause of the "OP Error -1" indications:
OP_ERR, OP_GRP, OP_OPT, OP_PRI and OP_TXT.
Regards,
Martin Theobald
PUBLIC
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx <foxboro-bounce@xxxxxxxxxxxxx> On Behalf Of
Daniel Wu
Sent: 17 November 2021 04:19
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro] Debugging Sequence Codes
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Hi List,
I don't use much sequence programs in our application; and, instead, I use I/A
blocks. Therefore, I am not familiar with the different commands listed in a
Sequence FoxDetail screen to control the execution of a sequence program. These
commands are "NEXT STMNT", "EXEC STMNT", "EXEC STEP", "EXEC SBX" and so on.
I wrote a sequence program to control several GDEV's and control valves (PIDA)
to charge raw materials to a kettle. When I ran it, there were run time errors
message like "SBX SYSERR" and "OP Error -1" appeared briefly on the FoxDetail
screen.
Trying to debug the runtime errors, I switched the sequence block to 'STEP"
mode with the expectation that by executing one statement at a time, I would be
able to identify which statement caused the problem. I believe the problems
occurred when the program was passing a CB name to a DEVICE subroutine to
open/close a GDEV. However, using "NEXT STMNT", "EXEC STMNT" and "EXEC STEP"
commands did not execute one statement at a time. Instead, multiple statements
were executed with the "SBX SYSERR" and "OP ERROR -1" flashed briefly on the
FoxDetail page. I believe by executing the DEVICE subroutine call, it stepped
inside the subroutine; and resulted in executing multiple statement instead of
one.
I did not have any luck in finding any information on how to use these
commands. Would you mind pointing me to the Foxboro users guides with
information on how to use these commands or be kind enough to explain to me how
to use these commands to trouble shoot my sequence program run time problems.
Thanks
Daniel
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