Re: [foxboro] FBM off-line
- From: "Boulay, Russ" <Russ.Boulay@xxxxxxxxxxxx>
- To: "foxboro@xxxxxxxxxxxxx" <foxboro@xxxxxxxxxxxxx>
- Date: Tue, 13 Dec 2011 20:07:40 -0500
Joe,
Below caption was taken from the B0400FA Din Rail User Guide...hope it helps...
Fail-Safe Functionality
FBM actions that occur during various failed conditions are dependent upon two
things: the configuration
of the FBM fail-safe parameters and the type of FBM failure.
Two basic types of FBM failures can occur:
Type 1 failures, such as FBM OFF-LINE, FBM DOWNLOAD, or FBM
EEPROM UPDATE, involve an actual FBM failure.
Type 2 failures (COMM FAIL), involve a
loss of communications.
Fail-Safe for Type 1 Failures - FBM FAIL
Two variables (parameters), fail-safe mask (FSMM1) and fail-safe data (FSD0n),
determine the
action that the FBM takes when a Type 1 failure occurs. FSMM1, configured for a
particular output,
determines the state that is asserted at the output: Fallback Value, or Hold
Current Value.
The default setting of the fail-safe mask parameter is zero, to assert the
Fallback Values. The mask
can be set so that some outputs hold while others fall back. FSD0n, also
configured for a particular
output, determines the fallback value. The default value for analog outputs is
zero, and the
default value for digital values is false.
Fail-Safe for Type 2 Failures - COMM FAIL
In addition to the fail-safe mask and fail-safe data parameters, there are two
other parameters,
FSENAB and FSDLAY, that affect the FBM’s response to communications failures.
FSENAB
determines whether the output simply holds (FSENAB = 0) its output value during
the
communications failure until the communications failure ceases, or if it delays
fail-safe action
(FSENAB = 1) for the time specified by FSDLAY and then responds in the same way
as Type 1
failures.
Fail-Safe
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On
Behalf Of Riccardi, Joseph
Sent: Tuesday, December 13, 2011 3:18 PM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] FBM off-line
Terry,
I read the exact same quote you referenced and came to the same
conclusion but was hoping to verify it with this inquiry to the List.
I'll wait until tomorrow and if nothing else pops up I'll run with our
conclusion until I can also test it.
Thanks.
Joseph M. Riccardi
Senior I&C Engineer
Bechtel Parsons Blue Grass Team
Richmond, KY
859-626-4368 Office
386-451-7607 Personal Cell
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]
On Behalf Of Terry Doucet
Sent: Tuesday, December 13, 2011 5:53 PM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] FBM off-line
Joseph,
I always loved the small note in EDOC below the description of the ECB's
FSENAB parameter.
"FSENAB does not affect Failsafe configuration. Setting FSENAB false
does prevent the FBM from going to the Failsafe state because of
CP-to-FBM communications failure, but it cannot prevent the FBM from
going to Failsafe for any other reason."
I'm pretty sure that the action that you describe (taking FBM off line
in System Manager) is one of those "other reason"(s). So if you have
selected and configured values for your outputs in the ECB, then taking
the FBM off line will force the values at the outputs regardless of your
configuration of the FSENAB parameter. But I have not tested it
recently.
Terry
> Subject: [foxboro] FBM off-line
> Date: Tue, 13 Dec 2011 15:43:08 -0600
> From: Joseph.Riccardi@xxxxxxxxxxx
> To: foxboro@xxxxxxxxxxxxx
>
> Folks,
> What state do the outputs go to when the FBM is manually taken
off-line
> (i.e., digital outputs, etc.)? Failsafe settings, just like lost
> communications to the CP? Or something else?
>
> Joseph M. Riccardi
> Senior I&C Engineer
> Bechtel Parsons Blue Grass Team
> Richmond, KY
> 859-626-4368 Office
> 386-451-7607 Personal Cell
>
>
>
>
>
>
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