Fisher FIELDVUEDVC6200f Instruction Manual page 319

Instruction Manual
D103412X012
Alarm Detection
To select the state that initiates an input alarm, and to set discrete alarm substatus in the output, configure the
DISC_LIM [23] parameter. You can enter any value between 0 and 255. A value of 255 disables the alarm. When
OUT_D [8] matches the DISC_LIM [23] state, the discrete value of an alarm is set.
Block Errors
Table E‐40 lists conditions reported in the BLOCK_ERR [6] parameter.
Table E‐40. DI BLOCK_ERR Conditions
Condition Number
1 Block Configuration Error—CHANNEL set to 0 through 10 (uninitialized)
3 Simulate Active—Simulate is enabled. Output does not reflect process conditions
7 Input failure/process variable has Bad status—The hardware is bad or the transducer block mode is Out of Service
14 Power Up—Set after power‐up until actual mode is not Out of Service
15 Out of Service—The actual mode is Out of Service (OOS). The block is not being processed.
Action on Failure
In case of hardware failure, FIELD_VAL_D [17], PV_D [7], and OUT_D [8] change to a Bad status and the BLOCK_ ERR
[6] parameter shows Process Variable has Bad Status. If the transducer block mode is Out of Service, the status of
FIELD_VAL_D [17], PV_D [7], and OUT_D [8] is set to Bad:Out of Service.
Simulation
To support testing of the control strategy, you can enable the SIMULATE_D [9] parameter. Normally the measurement
value and status used for FIELD_VAL_D [17] in the DI block reflect actual process values as provided by the transducer
block. When the SIMULATE_D [9] parameter is enabled, value and status used for FIELD_VAL_D [17] is supplied by the
user manually. To enable simulation in the DI function block, the simulate jumper must be installed. For information
on the installation of this jumper, see the Installation section.
The SIMULATE_D [9] parameter has three components:
D Simulate_D enable/disable determines whether the function block will use the actual process value and status, or
Simulate Value and Simulate Status.
D Transducer Value and Status reflect the process values provided by the transducer block.
D Simulate Value and Status may be entered by the user when enable/disable is set to enabled.
To use simulate, first install the simulate jumper in the terminal box, then set Simulate_D enable/disable to enabled,
then enter the desired values for Simulate Value and Status.
When SIMULATE_D [9] is enabled, the Simulate Active bit of the BLOCK_ERR [6] parameter is set (refer to the Block
Errors description). When the simulate jumper is installed, the Simulate Jumper bit of the transducer block parameter
SELFTEST_STATUS [78] is set.
Application Information
Figure E‐30 compares the operation of a standard discrete input to a proximity discrete input. With the standard
discrete input, the discrete input changes state when the valve position passes a configurable trip point. This can be
used to indicate if the valve position is above or below the trip point.
Condition Name and Description
DVC6200f Digital Valve Controller
DI Function Block
February 2017
319