Eurotherm 6100, User Manual

Page: 85 / 397

100/180MM DISTRIBUTED GRAPHIC RECORDER: USER GUIDE
HA029324
Issue 11 Oct 14 Page 69
4.3.3 CHANNEL/ALARM CONFIGURATION (Cont.)
DESCRIPTOR
Allows a text string of up to 30 characters (including spaces) to be entered for the channel descriptor (e.g.
‘Turbine 2 tempA’).
A/B SWITCHING
If enabled, this function allows alternative Span, Zone and Trace Colour values to be entered. ‘A’ values
are used during normal operation. ‘B’ values are switched to by job action, as described in
section 4.7 .
SPANNED
This box, when selected, allows span low and high values to be entered. For example, in an input range
of 0 to 600 deg C, it may be that the temperature range between 500 and 600 degrees is of most inter-
est. In such a case, setting span low to 500 and span high to 600 will cause the recorder to display only
that part of the input range, and this will fi ll the zone width which is selected next, effectively magnifying
the area of interest.
If A/B switching is enabled, a second set of span low and span high values can be entered. ‘A’ values are
used during normal operation. ‘B’ values are switched to by job action, as described in
section 4.7 .
ZONE
This allows the portion of the chart which the channel occupies to be defi ned in terms of percent, where
the left edge of the chart is 0% and the right hand edge is 100%. For example, setting a low value of 50
and a high value of 100 causes the channel trace to be confi ned to the right hand half of the chart.
If A/B switching is enabled, a second set of zone low and zone high values can be entered. ‘A’ values are
used during normal operation. ‘B’ values are switched to by job action, as described in
section 4.7 .
PV FORMAT
This allows the PV value, alarm setpoints, hysteresis values etc. to be displayed as normal numeric val-
ues ( Numeric) or in ‘ Scientifi c’ format (Scientifi c). When ‘Scientifi c’ is selected, values are displayed and
entered as a decimal number between 1 and 10† (the mantissa), followed by a multiplier (the exponent).
E.G. to enter a value of 1244.5678, the value entered would be 1.2445678E3, where 3 represents the
number of places that the decimal point has been shifted to the left in order to convert the value to a
number between 1 and 10†. To enter a value of 0.0004196, the entry would be 4.196E-4.
† Notes
1. Strictly this is a number less than 10, as 10 would be 1.0E1.
2. There must be at least one number after the decimal point.
MAXIMUM DECIMAL DIGITS
This defi nes the number of decimal places in the process value. Settable between zero and nine. Lead-
ing and trailing zeros are not displayed. Values too long for the available displaying width are truncated
as described in
section 3 .
COLOUR
Allows the trace colour to be selected from a colour chart. Each of the 56 available colours is displayed
with a number, and it is this number which is entered. The background colour to the selection box chang-
es to the selected colour.
If A/B switching is enabled, a second colour selection can be entered. Colour ‘A’ is used during normal
operation. Colour ‘B’ is switched to by job action, as described in
section 4.7.
ALARM NUMBER
Allows an alarm to be selected for confi guration.