Hardware manual

Chapter 2 - TeleFlow Standard ACCOL Load
TeleFlow™ Standard ACCOL Load
2-4
Input Override and Calibration Mode
The 'in use' signals can be 'frozen' at their current value by setting their standard
ACCOL Control Inhibit (CI) on. When an 'in-use' signal (DP, P, or T) is in 'CI' mode,
the 'live data' signal continues to reflect the current value from the internal sensor,
however, the 'in-use' signal is no longer updated and remains 'frozen' at its current
value. Input averaging continues to be performed using the 'in-use' value rather
than the 'live data' value.
While the 'in-use' signals are in CI mode the Operator can enter an 'Override' value
into the signal for use in the input averaging and Gas Flow calculation.
When the CALIB (Calibration mode) signal is set ON all the DP, P, and T 'in-use'
signals are simultaneously placed in CI mode.
Input Alarms
The process inputs DP, P, and T are alarm signals with the following default alarm
limits:
Low
High LowLow HighHigh LDb HDb
DP 10 250 0 300 3 10
P 100 1500 0 2000 10 50
T 50 150 32 250 3 10
Digital Inputs
Inputs 1 and 2 are free for general use and can be used as alarm inputs or
monitoring inputs. The default alarm condition is the ON state, i.e. the alarm
occurs when the input enters its ON state. These inputs are updated once a second.
Digital Outputs
The discrete outputs are shared by the Flow control and Sampler function.
When Flow control is enabled:
DO 1 - Raise pulse output.
DO 2 - Lower pulse output.