The FDSI has optimization of scanning that MG30 doesn't have, so some
addresses not scanned by MG30 may
now be scanned by FDSI unless you set up specific scan groups.
This is a problem with some Modbus-like devices which report errors when
unused addresses are scanned.
For example, an obscure ABB gateway connected to parallel electrical units
in a precipitator system.
The analog input addresses where in registers something like:
401025 to 401032 Set 1
401089 to 401096 Set 2
401153 to 401160 Set 3
We set up IINs for the 16 registers in each set. The FDSI optimized
scanning and so scanned registers
between the blocks of data. The ABB Gateway didn't like that as it
reported as an error any attempt to
scan registers it didn't have defined.
As such, we defined a separate scan group for each data set. FDSI scanned
the registers in these groups
Specifically, and no others. Problem Solved.
(By the way, the MG30 being replaced did have a separate MDSCAN group for
each of these sets.)
William C Ricker
FeedForward, Inc.
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On
Behalf Of miten thakkar
Sent: Friday, December 16, 2016 1:12 AM
To: foxboro freelist <foxboro@xxxxxxxxxxxxx>
Subject: [foxboro] MODBUS MGFT30 vs FBM231 query
Currently third party Device is connected to I/A Nod bus using MGFT30. It is
having PCTYPE parameter 2 (i.e. 584 type device) FBM 231 is not having such
parameter. So should this make any difference because we are not able
communicate with third party device using FBM 231 with other parameters
remaining same(like baud,start bit,stop bit,parity,heart bit,slave address)
?
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