Explanation Of Modes - Fisher FIELDVUEDVC6200f Instruction Manual

DVC6200f Digital Valve Controller
F Fieldbus Communication
OUNDATION
February 2017
Note
A downstream block changing to Out of Service impacts the mode of the upstream block. Refer to the block hierarchy in
figure D‐2.
Figure D‐2. Digital Valve Controller Block Hierarchy Example
RESOURCE BLOCK
PID BLOCK
NOTES:
1. CHANGING THE RESOURCE BLOCK TO OUT OF SERVICE CHANGES ALL FUNCTION BLOCKS
TO OUT OF SERVICE, BUT DOES NOT AFFECT THE TRANSDUCER BLOCK.
2. CHANGING A DOWNSTREAM BLOCK TO OUT OF SERVICE AFFECTS THE UP STREAM BLOCK.
FOR EXAMPLE: WHEN THE TRANSDUCER BLOCK IS OUT OF SERVICE, THE AO BLOCK MODE
WILL CHANGE TO IMAN (INITIALIZE MANUAL).
Note
There is no mode associated with the F

Explanation of Modes

Out of Service (OOS)—The functions performed by the block are not executed. If the block has any outputs, these
typically do not update and the status of any values passed to downstream blocks will be "BAD". To make changes to
some of the parameters in a block requires that the block be Out of Service.
Initialization Manual (IMan)—Only the AO, DO, OS, PID, and CSEL blocks support this mode. When one of these blocks
detects a loss of a correct path to the downstream block (such as when the downstream block is in the OOS, Man, or
LO mode), it enters the IMan mode. For example, when the transducer block enters the OOS mode, the AO block
enters the IMan mode.
Local Override (LO)—Only the AO, DO, and PID blocks support this mode. If the PID block enters the LO mode, the
block output follows the tracking value (TRK_VAL), if external tracking is enabled by TRK_IN_D. In the AO and DO
block, the block enters LO mode when the block detects that fault state is active. In this case, the output is determined
by the selection for I/O_OPTS.
Manual (Man)—If the data status of a function block's input is bad or its target mode is Man, the block enters the
manual mode. In this mode, the function block does not update its OUT value. If the target is Man, the user may write
a desired value to the output.
Automatic (Auto)—The block performs the specified calculations based on the local set point and outputs the result,
independently without interfacing with another block. The user can write to the set point of a block in this mode. Any
block outputs continue to update.
Cascade (Cas)—The block performs the specified calculations based on the set point from another block via the
cascade input parameter and outputs the result. Any block outputs continue to update.
200
ANALOG OUTPUT
TRANSDUCER
(AO) BLOCK
BLOCK
fieldbus Loop. Mode is dependent on the blocks within the Loop.
OUNDATION
Instruction Manual
D103412X012