West Control Solutions MRC 9000 - Manual (Page 307)

Appendix C Edition 3
Rev G C-12
Sensor break
While there are sensor break jumpers, JU1 and JU4, sensor break and out-of-range conditions are actually
determined and handled by the software. When either occurs, the software will drive the input value to +99999 or
-99999 based upon whether SENSOR BREAK is software configured for UPSCALE or DOWN SCALE. Any
outputs will react accordingly. Out-of-range is defined as being more than 5% out of the span established by
RANGE LIMIT LOW and RANGE LIMIT HIGH.
For 5 or 10 volt and current inputs, the analog signal goes to zero when there is a sensor break, due to voltage
divider or shunt resistors. For sensor break detection to work on these input types, the INPUT RANGE LOW
(analog signal low) and/or RANGE LIMIT LOW (engineering units low) parameters must be set high enough such
that at zero volts/mA, the resultant value will be at least 5% below the span established by RANGE LIMIT LOW
and RANGE LIMIT HIGH.
SIMULATED VARIABLES - System Prompts - Configuration - Page 4-98
Prompts section that configures up to four SVs (Simulated Variables) that can be used to simulate an input,
primarily for demonstration purposes. The functions available are: sin wave, square wave, spikes, or sawtooth.
SPAN 1 HIGH - System Prompts - Configuration - Recorders - Page 4-48
Parameter that specifies the trend value corresponding to the “top” of zone 1.
This parameter also specifies the “bottom” of zone 2, if two zones are used.
SPAN 1 LOW - System Prompts - Configuration - Recorders - Pag 4-48e
Parameter that specifies the trend value corresponding to the “bottom” of zone 1.
SPAN 2 HIGH - System Prompts - Configuration - Recorders - Page 4-50
Parameter that specifies the trend value corresponding to the “top” of zone 2.
START NEW CHART - Chart Prompts - Page 6-1
When YES is selected, the unit will initialize itself for a new chart and automatically return to the Normal Display
mode. This prompt appears only after the chart has been stopped by selecting YES at the CHANGE CHART
prompt.
STATE OR ON-OFF - System Prompts - Configuration - Relays - Page 4-66
One of the choices for RELAY x USAGE which specifies that the relay output will be energized whenever the
selected actuator is active. This is used for most applications.
STOP AFTER 1 REV - Chart Prompts - Chart Configuration - Page 6-11
Parameter which controls whether the chart stops recording after one revolution (360 degrees of rotation). If YES
is selected, trend data would typically continue to be collected and would be recorded after a new chart is in-
stalled.
SWITCH CONTACT - System Prompts - Configuration - Inputs - Page 4-3
One of the choices for INPUT TYPE which specifies that it is used as a contact-closure sensing the input.
Tx HOLD ACTUATOR - System Prompts - Configuration - Totalizers - Page 4-59
Parameter that selects an actuator which can suspend totalization when active.
Tx RESET ACTUATOR - System Prompts - Configuration - Totalizers - Page 4-58
Parameter that selects an actuator that will reset the total when active.
Tag
A general term which refers to a description or designation that is displayed or recorded. There are tags for the
instrument, chart, and each input, process variable, recorder, etc. Tags are text parameters.
TC TYPE - System Prompts - Configuration - Inputs - Page 4-3
Parameter which specifies the thermocouple type to be used.