Yokogawa digitalYEWFLO (DY) - Manual (Page 30)

IM 1F2B4-01-YIA
Page 34
QUICK START USING THE BT100/200
2.3 P
ARAMETER
S
ETTING IN
HART™ C
OMMUNICATIONS
When specified, the model YF100*E vortex flowmeter can be provided with HART™
communication functions. (To determine if this field communication protocol has been
incorporated in your instrument, confirm the “HART” suffix is a part of the YEWFLO model code.)
These functions enable the vortex converter to remotely carry out the following by communicating
with the HART communicator:
· Setting or changing parameters required for vortex meter operation such as tag number, flow span
and process conditions.
· Monitoring flowrate, totalized flow and self-diagnostics.
· 4-20 mA loop check (simulated output) and totalizer rest
The HART communicator can interface with YEWFLO from the control room, via direct connection
to the amplifier, or any other wiring termination point on the 4-20 mA loop. Polarity does not matter.
There must be a minimum of 250 ohms between the connection and the power supply. Refer to
Figure 1.3.2 on page 7 for power supply voltage requirements and load resistance.
Note1: The output jumpers on the amplifier must be set to the analog position to communicate. Only the
position of the jumpers affects remote communication ability, the software setting of pulse or 4-20 mA
has no effect.
Note2: When Yewflo is supplied with the HART option, the TBL digital display/local operator interface
cannot be used for parameter setting and configuration. Only two parameters are supported by the
TBL:
Parameter E01: Total reset
Parameter E02: Display Select
The amplifier has been pre-configured at the factory, so no setup should be required prior to
installation. If your process conditions have changed and reprogramming is required, the menu/
parameter configuration list for YEWFLO/HART can be found in Appendix B in the back of this
manual. Refer to the instructions provided with your HART communicator or operation details. The
QUICK START section of this manual will address only those parameters which must be set to
establish the operation of the meter for a particular application. Appendix B will cross-reference the
BRAIN parameters to the corresponding HART parameters.
2.3.1 Communication Specifications
Method of communication: Frequency shift keying (FSK). Conforms with Bell 202 Modem standard
with respect to baud rate and digital “1” and “0” frequencies.
Baud Rate: 1,200 bps
Digital “0” Frequency: 2,200 Hz
Digital “1” Frequency: 1,200 Hz
Data Byte Structure: 1 start bit, 8 data bits, 1 odd parity bit, 1 stop bit