100/180MM DISTRIBUTED GRAPHIC RECORDER: USER GUIDE
HA029324
Issue 11 Oct 14
Page 167
4.3.18 DEMAND WRITES (Cont.)
WRITING TO A SPECIFIC REGISTER (Cont.)
CONFIGURABLE PARAMETERS (Cont.)
Scaling
Whether Scaling appears or not is Model and Parameter dependent. If scaling is required,
the choice may be ‘Decimal Places, or High/Low, again according to Model.
‘Decimal Places’ allows a dividing factor to be entered. An entry of 1, divides the returned
value by 10. An entry of 2, divides by 100 etc. for successful implementation, there must be
a suffi cient number of decimal places defi ned in the ‘Max Decimal Digits’ confi guration fi eld
for the value to be displayed with the required precision.. ‘None’ leaves the returned value
unchanged. ‘None’ leaves the returned value unchanged.
For some slaves, scale zero (scale low) is returned as value 0 and full scale (scale
high) as value 65,535 (Hex FFFF) with intermediate values having proportionate val-
ues. For example the value 15, would be represented as 32,767 (7FFF) for a chan-
nel scale 0 to 30, as would a value of 50 for a channel scaled 0 to 100, and a value
of 45 for a channel scaled 30 to 60. In order to convert this reading to an understand-
able value, a scaling factor must be entered. If the low and high scale entries match
the slave channel’s scale, the master reading will be the same as the slave’s reading.
Selecting ‘High/Low’ allows Scale low and Scale high values to be entered for the selected
parameter. If ‘None’ is selected, the process value is displayed as a proportion of 65,535.
DEMAND WRITES WITH AUDIT TRAIL
Normal Audit Trail messages include both the new value and the previous value, for example
12/07/06 11:27:58 1) Temp1 Alarm Number 1 Enable Latched was Off
With Demand Writes, the recorder has no way of determining what the value of the parameter being
written to was, prior to the Write. For this reason no ‘was’ value is included in the message. A typical
Demand Write audit trail message would be:
12/07/06 11:35:10 Write _ 1 wrote 255.75
Please see
section 4.4.2
for more details of Audit Trail.
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