Emerson Fisher FIELDVUE DVC6000f, Instruction Manual

Page: 64 / 384

DVC6000f Digital Valve Controllers
December 2009 4-4
Resource Block Overview
The resource block contains the hardware specific
characteristics associated with a device; it has no
input or output parameters. The resource block
monitors and controls the general operation of other
blocks within the device. Most of the resource block
parameters are operational parameters that provide
information about the instrument such as identification,
hardware information, available options, etc. and are
read only. Configuration of the resource block involves
selecting features from those that are available,
setting the mode, setting write lock, and setting up
alert reporting details.
The following procedures address only the key
resource block parameters; however, all resource
block parameters are listed in table 4-3.
Configure/Setup
Setup
Resource Block Mode
(RB
>
Configure/Setup
>
Setup
>
Resource Block
Mode)
Modes
The resource block can be in one of two modes
(MODE_BLK [5]):
Automatic (Auto)—This is the operational mode for
this block. When the resource block is in the Auto
mode, all other function blocks are allowed to function
normally.
Out of Service (OOS)—Placing the resource block
in Out of Service mode stops all function block
execution, by setting their modes to Out of Service as
well. The actual mode of the function blocks is
changed to Out of Service, but the function block
target modes are retained. Placing the resource block
in the Out of Service mode does not affect the mode
of the transducer block.
Write Lock
(RB
>
Configure/Setup
>
Write Lock)
Write Lock
Write Lock (WRITE_LOCK [34]) determines if writes
are permissible to other device parameters. The
Firmware Write Lock feature must be selected to be
able to use Write Lock (see Features). When Write
Lock is set to Locked, no writes are permitted to any
parameters within the device except to set Write Lock
to Not Locked. When locked, the device functions
normally, updating inputs and outputs and executing
algorithms. When Write Lock is set to Not Locked, the
Write Alarm (WRITE_ALM [40]) alert is active.
Write Priority
Write Priority (WRITE_PRI [39]) sets the priority for
Write Alarm. The lowest priority is 0. The highest is
15.
Communication Time Out
(RB
>
Configure/Setup
>
Communication Time Out)
Shed Remote Cascade
Note
Typically this parameter does not need
to be changed. The unit will be
operational using the default values
assigned by the factory. Perform this
procedure only if a remote computer is
sending setpoints from your
“advanced” control.
Default value for RCas Timeout is 20
seconds.
Shed Remote Cascade (SHED_RCAS [26])
determines how long function blocks in the DVC6000f
should wait before giving up on remote computer
writes to RCas parameters. When the timeout is
exceeded, the block sheds to the next mode as
defined by the block shed options. If Shed Remote
Cascade is set to 0, the block will not shed from RCas.
Enter a positive value in the Shed Remote Cascade
field. Time duration is in 1/32 milliseconds (640000
=
20 secs).
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