Operating Mode; Hours Run - Honeywell Excel 50 User Manual

Automatic operation
Manual operation
Manual value
EN2B-0137GE51 R0216
This attribute enables the user to switch between manual and automatic operation.
Under normal automatic operation, the controller processes the values at the inputs,
e.g. from temperature sensors. For outputs, under normal operation, the status
shown by the user / time program is adopted, e.g. 'Heating circuit pump off'. The
feedback loop of the control system is closed.
During manual operation, the controller uses the manual values, e. g. 'Flow tem-
perature setpoint = 60 °C'. Outputs adopt the preselected condition, e. g. 'Heating
circuit pump on'. The feedback loop of the control system is interrupted.
For automatic operation, the attribute "Operating Mode" contains the inputs 'Auto'
and 'Manual'. Each change from automatic to manual and back again generates a
critical alarm.
Value When the controller is working in automatic mode (the attribute "Operating Mode" is
set to 'Auto'), the value or the current status being processed by the application
program can be found in the attribute "Value". The attribute "Value" for an analog
input is, for example, the current room temperature of 21 °C / 70 °F. The attribute
"Value" for a pump switched by the digital output is, for example, the current status
'ON'.
When the controller is working in manual mode (the attribute "Operating Mode" is set
to 'Manual'), the preset manual values can be found in the attribute "Manual Value".
Example:
In the example shown, the attribute "Operating Mode" is set to 'Manual', i.e.
the data specified manually is written into the attribute "Manual Value", pro-
cessed in the controller, and passed on to an output. The user can, of
course, recall the measured value coming from the attribute "Value", but
this has no effect on the application program.
An hours run log can be carried out for digital data points (physical and pseudo), e.g.
Iogging the hours run by a heating circuit pump. The accumulated hours run are
displayed in the attribute "Hours Run". The corresponding values have a resolution
of 1 minute.
60
EXCEL 50 - USER GUIDE

Operating Mode

Hours Run