Re: [foxboro] FBM231 RS485 COMMUNICATION
- From: "van Doorn, Gerrit" <gerrit.vandoorn@xxxxxxxxxxxx>
- To: "foxboro@xxxxxxxxxxxxx" <foxboro@xxxxxxxxxxxxx>
- Date: Sat, 30 Jun 2012 19:53:55 -0400
Rakesh,
Floating point is supported.
First of all, if you haven't done it, remove the Backup FBM from the base-plate
to test the configuration with a single operating Modbus Master. Makes life
much easier for troubleshooting....
Did you add the +H to the XML configuration if the Slave supports function code
8 (diagnostics)? If this option is enabled and there is no FDSI block
configured, it will only send out heartbeats. If the device stays healthy in
SMDH it proves that the wiring & termination is correct because the heartbeat
is replied.
If you add the +H and the device fails it is not in your FDSI block
configuration. Then you might have to swap the "+" and "-" on the RS-485
wiring, or enable termination, or check the SG & Sh, or check the dipswitches
on the TA. Even if you do not use RS-232, the dipswitches do have influence on
the RS-485 communication so they must all be switched to OPEN. If you have the
FDSI driver 1.1QF2 or later AND you are using a TA (Terminal Assembly board)
rev E, you may have to toggle only C5 and C6 to CLOSED (noise immunity
enhancement).
BTW: Are you sure it is address 430001 (6 digits) and not 43001 (5 digits).
It's not quite common for Slaves to support the 6 digit numbering (especially
older Slaves do not support this).
PS: When you checked the configuration with ModScan, did you use the RS-485
communication (including the converters if you are using converters in the
field) or did you use RS-232?
FoxDoc B0700BG explains the Modbus FDSI Protocol Handler.
FoxDoc B0700AH explains quite in detail how to wire, ground and terminate the
wiring between the TA and devices.
Good luck,
Gerrit van Doorn
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On
Behalf Of RAKESH DASH
Sent: zaterdag 30 juni 2012 19:53
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro] FBM231 RS485 COMMUNICATION
Hi there,
I am trying to interface FBM231 with an external device over RS485.
The modbus data is Holding Register Floating Point (4 bytes)
I checked the communication and data using modscan in a laptop and all is
good.
The configuration in FDSI baud rate etc. is also fine
FBM231 is showing healthy on communication.
But As soon as I define even one signal in the RIN block in the compound
for receiving the data & download, the FBM231 goes out of order and shows
me as device failed.
I have configured the point address PNT_NO as 430001:F4.
I there any known issue of such kind ? Does the FBM231 support floating
point signals ?
I am stuck with this and I have to wind this up by Tuesday. Any help on the
subject is appreciated. Thanks !!
Regards,
- Rakesh
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