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172-082010_400 I Series Software Page 30 of 35
the setpoint due to the time it takes to move the valve to a new stable position. This
error should decrease over time and approach a very small value. A large error that
persists for a significant amount of time after a change in the command signal is an
indication of a failure in the system. Typically, this is caused by insufficient pressure
for the requested flow or a failed valve.
item 16:trckg alarm limit: flow units
read V16(cr) or *[aa]V16(cr)
Sample reply: 5.0 SLM(cr)>
write V16= 2.00(cr) or *[aa]V16= 2.00(cr)
If the flow alarm enable is set (V18) and the tracking error remains above this limit for
longer than the time specified by the tracking alarm delay (V19) the tracking alarm bit
will be set in the alarm status word. This can enable one of the hardware alarms if it is
configured. This item configures or reports the limit in the flow units chosen in the
active gas record (G7). Writing to this item will affect the value reported back by V17
below.
item 17:trckg alarm limit: % of full scale
read V17(cr) or *[aa]V17(cr)
Sample reply: 1.0 %(cr)>
write V17= 2.00(cr) or *[aa]V17= 2.00(cr)
If the tracking alarm enable is set (V18) and the tracking error remains above this limit
for longer than the time specified by the tracking alarm delay (V19) the tracking alarm
bit will be set in the alarm status word. This can enable one of the hardware alarms if
it is configured. This item configures or reports the limit as a % of the full scale flow
value listed in the active gas record (G2). Writing to this item will affect the value
reported back by V16 above.
item 18:trckg alm enable:
read V18(cr) or *[aa]V18(cr)
Sample reply: 1(cr)>
write V18= 0(cr) or *[aa]V17= 0(cr)
This is a binary value that when enabled it will allow tracking error values that exceed
alarm limits for a time longer than specified by the tracking alarm delay to set bit 8 of
the alarm status word. Setting this bit also sets the bit 11 of the MFM config word (S2).
item 19:trckg alarm delay:
read V19(cr) or *[aa]V19(cr)
Sample reply: 0.00 S(cr)>
write V19= 2.0(cr) or *[aa]V19= 2.0(cr)
This defines the length of time in seconds between the start of an error condition until
the time it is reported by the alarm status word. This will allow the valve time to
stabilize to a new setpoint without setting off the alarm. A setting of 0.00 will result
in an immediate response.
item 20:trckg warn limit: flow units
read V20(cr) or *[aa]V20(cr)
Sample reply: 5.0 SLM(cr)>
write V20= 2.00(cr) or *[aa]V20= 2.00(cr)
If the tracking warning enable is set (V22) and the tracking error remains above this
limit for longer than the time specified by the tracking warning delay (V23) the