Flowserve BUSwitch-Profibus-DP - Manual (Page 5)

LML0012-0 8/99 Page 5 of 6
©1999, Flowserve Corporation, Provo, Utah
Flowserve Corporation
Flow Control Division
Automax BUSwitch
TM
– Profibus-DP
765 South 100 East
Provo, Utah 84606
www.flowserve.com
Phone: 801 373 3028
Facsimile: 801 489 2228
Email: [email protected]
OP (OPen) Changing this bit from a zero to a one
will result in the valve actuating to the open position
- only if the valve is in the closed position. If the
valve is currently in the ‘OPEN’ state, this bit will be
ignored. This bit is dependent on the value written
to the closed bit (CL). If CL contains a one when OP
is set to one, actuation will not occur until CL is
reset.
CL (CLosed) Changing this bit from a zero to a one
will result in the valve actuating to the closed
position - only if the valve is in the open position. If
the valve is currently in the ‘CLOSED’ state, this bit
will be ignored. This bit is dependent on the value
written to the open bit (OP). If OP contains a one
when CL is set to one, actuation will not occur until
OP is reset.
RS (Odometer ReSet) Setting this bit to a value of
one will result in the odometer counter being set to
zero subject to the following conditions:
1. RS is set to one
2. OP is set to zero
3. CL is set to zero
4. The odometer limit has all bits set to 1
5. No valve actuation is currently in process
AL (ALarm) The value written to this bit will affect
the meaning of the external alarm input of the
BUSwitch. When a zero is placed in this position,
the external alarm bit (EX) of the BUSwitch output
data packet will be set to a one when the connection
to the external alarm input terminals is broken.
Placing a one in this position will result in the EX bit
being set when a closed connection is made to the
external alarm input terminals.
FA (Failsafe Arm) If communication over the
network is lost, the default action of the valve is to
fail in place. By setting this bit to one, either fail
open or fail close can be enabled. The fail direction
is determined by the state of the FO bit described
below.
FO (Fail Open) This bit determines the direction of
the fail action when the FA bit has been enabled.
When this bit is set to zero and the FA bit is set to
one, the valve will fail close upon loss of
communication with the master. If it is desired for
the valve to fail open, set this bit to one.
The following truth table illustrates the interactions
between the FA and FO bits.
FA FO Failsafe Action
0 0 Fail in place
0 1 Fail in place
1 0 Fail closed
1 1 Fail Open
Table 5
Odometer Limit: The odometer limit is a 32-bit
value that is comprised of words 3 and 4 of the input
data packet. When the odometer counter exceeds
this value, the Odometer Limit (LI) bit of the output
data packet is set to one, indicating an alarm
condition. When set to zero the BUSwitch will
default to 2,000,000. Valid range is from 0 to
4,294,967,295 (2
32 -1).
One-shot Duration: Integer value that when
multiplied by 0.05, represents the number of
seconds to energize the solenoids in dual coil mode.
Any integer value between 0 and 65535 can be
input, however, values below 10 (0.5 seconds) will
result in a value of 10 being used. Integer values
above 6000 (300 seconds) will result in 6000 being
used. To calculate the value to enter from a desired
time value, divide the time value by 0.05 and round
to the nearest integer.
Valve Opening Timeout / Valve Closing Timeout:
When a either the OPEN or CLOSE solenoid is
activated, the response time for the valve to
complete the transition is monitored and compared
to the limit specified by the user for that respective
operation. If the transition time exceeds the value
specified for that operation, the time-out (TO) bit will
be set to one in the BUSwitch output data packet.
As with the one-shot duration value above, the value
entered into these words represent 50 millisecond
intervals. Values entered that are below 10 (0.5
seconds) will default to 10 (0.5 second). Values
above 6000 (300 seconds) will default to 6000.
Allowable input range is from 0 to 65535.