Instruction Manual
D103412X012
Detailed Setup—Transducer Block
July 2013
62
Transducer Block
Overview
The transducer block accepts a signal from an output block as a set point to position a valve using a pneumatic
actuator. Input to the transducer block is in percent. Closed is 0%, and open is 100%. The transducer block contains
setup and calibration information and can be tuned to closely match the actuator. Input characterization permits
modifying the overall characteristic of the instrument‐actuator‐valve combination in order to modify the installed gain
characteristic of the loop. The transducer block can also be used to perform instrument and valve diagnostics and
trigger performance alerts.
The following procedures address only the key transducer block parameters; however, all transducer block parameters
are listed in table 4‐14.
Detailed Setup
Note
To setup and calibrate the instrument, the transducer block Mode must be Manual and the Protection must be None.
Transducer Block Mode
Field Communicator TB > Configure/Setup > Detailed Setup > Transducer Block Mode
Modes
The transducer block can be in one of three modes (MODE_BLK [5]):
Automatic (Auto)— This is the normal mode for this block. When the transducer block is in the auto mode, it accepts
the output from the AO or DO block as a set point and outputs a drive signal to the I/P converter based upon this set
point.
Out of Service (OOS)— Placing the transducer block in Out of Service mode changes the output to the zero power
(no I/P drive) condition.
Field Communicator
Manual (MAN)— Placing the transducer block in Manual will hold the value at the current setpoint (FINAL_VALUE
[13]). The transducer block will not accept changes from the AO or DO blocks. This mode is required to change some
parameters and to run some diagnostics.
Protection
Field Communicator TB > Configure/Setup > Detailed Setup > Protection
To configure any parameters in the digital valve controller Write Lock (WRITE_LOCK [34]), in the resource block, must
be set to Unlocked (refer to page 45). In addition, protection is provided for various transducer block parameters, as
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