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172-082010_400 I Series Software Page 27 of 35
msb lsb
15 0
bits 15(msb) to 9; reserved, unused
bit 8: One bit field controls automatic valve shutoff threshold. Setting bit to 1 disables the
1% threshold for automatic valve shutoff when the implemented setpoint is 1% or less.
When this bit is clear (0) the instrument will interpret any command of less than 1% of full
scale to be a command to close the valve.
If this bit is set (1) the instrument will control flows down to 0% Full scale. Command signals
that are identically = 0% or less will activate the close valve control..
Flow totalizer threshold action is not affected.
bits 7(msb), 6: Field of two bits selects source of command setpoint:
00 = invalid assignment, choice will be forced to default (network)
01 = command setpoint taken from network command
10 = command setpoint taken from A/D converter #1
11 = invalid assignment, choice will be forced to default (network)
bits 5,4: Field of two bits selects source of controlled variable:
00 = Controlled variable taken MFM sensor flow value
01 = Controlled variable taken from A/D converter #0
10 = Controlled variable taken from A/D converter #1
11 = undefined
bits 3,2: Field of two bits selects source of valve override command:
00 = no valve override except powerup default, on error and by network command
01 = valve override from A/D converter #0
10 = valve override from A/D converter #1
11 = undefined
bit 1: Set if valve powerup and error default is PURGE.
Clear if valve powerup and error default is SHUT.
bit 0 (lsb): Set if derivative (rate) term in feedback control loop is taken as the derivative of
tracking error (controlled variable minus implemented setpoint.
Clear if derivative (rate) term in feedback control loop is taken as the derivative of controlled
variable.
A change in this selection will not be bump less.
item 3 :valve posn: (read only)
read V3(cr) or *[aa]V3(cr)
Sample reply: x00(cr)>
Read only indicator of valve control status. See Valve Position word in control and
status words section.
x10 SHUT.
x20 PURGE
x30 HOLD