[foxboro] String 2 ASCII
- From: "Ahmed K. Sayed" <a.sayed@xxxxxxxxxx>
- To: <foxboro@xxxxxxxxxxxxx>
- Date: Mon, 14 Jun 2010 08:17:42 +0300
Hello list,
I need some help on communication requirement with one MODBUS TCP device
via FDSI link.
DCS has to send some specific string messages indicating package status,
lot number, time stamp, product type, etc.
What I normally do for such requirements is to map those predefined
strings to integer numbers, and through graphics or simple CALCA I can
send them.
The requirements here is bit different, those strings are not
predefined, i.e. any text can be entered by operator must be sent to the
MODBUS device for historical notes recording.
The vendor has defined the ASCII mapping he's using, which maps every
character to specific register bit coding.
Example: if the DCS transmits string "OFF" then the corresponding
registers must have the following values:
Register 0001 = 464F
Register 0002 = 0046
Register 0003 to 0016 = 0000
Where 0x46 is the ASCII code for the letter "F", and 0x4F is for letter
"O".
I've tried to use STROUT block, but failed to get it to work. It does
not accept the allocated MODBUS registers giving "invalid point
connection".
There isn't any information mentioned the use of STROUT/STRIN blocks in
FDSI TCP/IP & Serial MODBUS documentation; Only for other DCI blocks.
Is there any other built-in function that can do this transformation
from string to ASCII?
Regards,
Khaled
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