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AXAIM020-01 (AUTO-48) 3/03 Page 9 of 16

BUSwitch

™

with FOUNDATION

Fieldbus Protocol

Installation, Operating and Maintenance Instructions

Flowserve Corporation 1350 N. Mountain Springs Parkway 1978 Foreman Dr.

Flow Control Division Springville, Utah 84663-3004 Cookeville, TN 38501

www.flowserve.com Phone: 801 489 8611 Phone: 931 432 4021

Transducer Block

The Transducer Block (TB) provides the link between

standard function blocks (DO-1, DO-2, DI-1, & DI-2)

and the sensors and piezo/coil actuators within the

BUSwitch

™

device. It tracks number of valve strokes.

The TB also provides some configuration flexibility.

This section details those parameters affecting the

function and configuration of the BUSwitch

™

device.

This discussion includes all operational aspects

of the function blocks as well. A complete list of

TB parameters follows at the end of the section.

Complete function block parameter lists are

provided in Appendices A and B.

Pneumatic Actuator Operation – Single Coil,

Fail Open or Fail Closed

For operation requiring a consistent fail position

(either open or closed), select the “Single Coil”

TB.OPERATION parameter. One DO block (DO-1)

is used. The TB reads DO-1 OUT_D Value and

energizes both the OPEN (P6) and CLOSE (P5)

terminals as shown in the Single Coil Truth Table.

To reverse the actuator fail mode for double acting

actuators, reverse ports 2 and 4. To reverse spring-

return actuators, actuator modification is necessary.

Single Coil Truth Table

When in Auto mode, DO1.OUT_D follows the SP_D

Value. If the user wishes to invert the above truth

table relative to SP_D, change the function block

IO_OPTS parameter to “Invert.” This will energize the

coil on an SP_D Discrete 0 and de-energize on an

SP_D Discrete 1. This toggle has the same effect

when “dual coil” mode is selected; it is necessary to

select “Invert” for both DO blocks.

Pneumatic Actuator Operation – Dual Coil,

Fail in Last Position

Select the “Dual Coil” TB.OPERATION parameter.

Dual Coil Operation uses both DO1.OUT_D and

DO2.OUT_D block parameters configured in an

interlocking manner. For valve movement to take

place, the OUT_D parameters must take on opposite

values as shown in the next table.

Dual Coil Truth Table

Referring to Figure 2, energizing the “OPEN” termi-

nals will provide air to Port 4 and energizing the

“CLOSE” terminals will provide air to Port 2. To

reverse the valve operation, either reverse the

solenoid valve wires on P5 and P6, or reverse the

actuator tubing connections on Port 2 and 4.

The TB.OUTPUT_CONFIGURATION parameter

selects whether solenoid pilot elements stay

energized or become de-energized after the valve

reaches its desired position. If the “Pulse” option

is selected, the elements will de-energize after

the length of time selected in the TB.TIME_OUT

parameter. The “Constant” setting maintains

element voltage until new DO-1 and DO-2 OUT_D

values are selected.

Valve Position Monitoring and Reporting

The BUSwitch

™

TB monitors the status of two limit

switches. SW1 is the upper switch and is set to trip

when the valve reaches the closed position. SW2 is

the lower switch and is set to trip when the valve is

open. The TB.SOLENOIDE_CLOSED parameter

displays SW1 status as False when not tripped and

True when tripped. TB.SOLENOIDE_OPENED

parameter displays SW2 status the same way.

The TB provides limit switch status to the READ-

BACK_D parameters of DO-1 and DO-2 respectively

per the following truth table.

Truth Table for READBACK_D Values

FOUNDATION

Fieldbus DO blocks write the READ-

BACK_D value to the PV_D variable within each

block. PV_D may then be linked to the BKCAL_OUT

variable. Figure 6 shows a schematic of a DO block

illustrating this feature.

DO1.OUT

D OPEN/CLOSE

De-energized

Energized

DO1

OUT

DO2

OUT

OPEN CLOSE

0 0

No Change No Change

1 Energized De-ener

gized

1 1

No Change No Chang

0 De-energized Ener

gized

SW1 SW2 DO-1

RDBK

DO-2

RDBK

Meaning

A A 1 1 Improper switch adj.

O 1 0 Actuator CLOS

O 0 1 Actuator O

PENED

O O 0 0 Actuator is moving

A = Activated or Tripped, O = Open or Not Tripped

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

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