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172-082010_400 I Series Software Page 16 of 35
This item stores the value of the sensor offset voltage. This is the value of the sensor
output when the flow is stopped. This offset is subtracted from the magnitude of the
current sensor output to remove the effects of sensor internal non-symmetry. This
value is typically between -0.3 and +0.3 volts.
This value can be written but it is normally controlled by the internal routines that
handle the re-zero requests. When the processor receives a re-zero request via the
“zro” command, from the internal switch or from the external remote zero lines the
processor will read the current sensor value and store it in item 16.
item 24:A/D#0 FS factor:
read S24(cr) or *[aa]S24(cr)
Sample reply: 5.0000(cr)>
write S24=5(cr) or *[aa]S24=5(cr)
This item stores the gain value that is used to calibrate the analog input to the desired
full scale range. This value is adjusted to make set-point analog/digital converter read
correctly when a full scale input signal is being applied.
item 25:A/D#1 FS factor:
Reserved for future use
item 26:A/D#0: (read only)
read S26(cr) or *[aa]S26(cr)
Sample reply: 5.0000(cr)>
This item reports value of the analog signal that is being received on the set-point
analog input lines. This analog input value is capability is also present in the flow
meters but it is not interpreted as a set-point input for a control valve. This could be
used to read the output signal from another remote sensor. This value will have the
same range and units as the analog output signal from the flow meter.
item 27:A/D#1: (read only)
Reserved for future use
item 28:hi alarm limit: (eng units)
read S28(cr) or *[aa]S28(cr)
Sample reply: 5.0000 SLM(cr)>
write S28=5.000(cr) or *[aa]S28=5.000(cr)
If the flow alarm enable is set (S7) and the flow remains above this limit for longer
than the time specified by the flow alarm delay (S8) the high flow 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 S29
below.
item 29:hi alarm limit: (% of full scale)
read S29(cr) or *[aa]S29(cr)
Sample reply: 90.00 %(cr)>
write S29=90.0(cr) or *[aa]S29=90.0(cr)
If the flow alarm enable is set (S7) and the flow remains above this limit for longer
than the time specified by the flow alarm delay (S8) the high flow 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