TXP-C20_Instruction_Manual_(Rev1.0)
REV – 1.0
[34-2900-0207-5 ]
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Figure 3-14 – Clock/Delays Screen
3.4.5
Diagnostics Menu
WARNING: Alarm processing is halted with the Diagnostics mode active.
The
Diagnostics
menu in Figure 3-13 is useful for testing standard and optional Input / Output devices such as relays
and 4-20mA outputs. Diagnostic menu items are described below:
Figure 3-13 – Diagnostics Screen
Output Zero / Output Span
DAC value (digital to analog converter) menu items are set at the factory to calibrate
optional 4-20mA Output boards. If field adjustment is required, monitor the 4-20mA output and set the Output
Zero DAC value for 4mA on each channel then set the Output Span DAC value for 20mA on each channel. These
menu items may also be used to drive 4-20mA into receiver devices without stimulating sensor inputs.
Input Min / Max
ADC (analog to digital converter) menu items are set at the factory with default values for each
channel of either 200 to 1000 counts, or, 400 to 2000 counts. Direct sensor input options (see Section 3) default to
the 10-bit settings of 200 to 1000 counts. The 4-20mA input option defaults to the 11-bit settings 400 to 2000
counts. These settings may be utilized to affect what input values provide ZERO and SPAN readouts. For example, if
an application required 8mA input to a 4-20mA input option board to read ZERO at 800 counts, an Input Min setting
of 800 would accomplish this.
