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SECTION 34 - DIAGNOSTICS AND TROUBLESHOOTING
FORM 160.54-M1
ISSUE DATE: 10/25/2019
JOHNSON CONTROLS
JCI COMPANY CONFIDENTIAL
34
This diagnostic screen is used to analyze the analog
and Digital inputs and outputs of I/O Board 031-02895-
000. The outputs can be manually set to a desired level
from here. Also, serial communications error statistics
are displayed here. See the description of this board in
SECTION 27 - LARGE TONNAGE CHILLER (LTC)
of this manual.
ANALOG INPUTS
The voltage level of each Analog Input at the indicated
input terminals is displayed as x.xx VDC.
ANALOG OUTPUTS
The analog outputs are in the form of 0 to 10 VDC or
0 to 20mA at each of the listed connectors. The values
displayed are the values the I/O Board is intending to
provide at the output connector. The voltage output is
at terminal 2 of each output connector and is displayed
as x.xx VDC. The current output is at terminal 1 of
each output connector and is displayed a xx.xxmA
The voltage value and the current value are directly
scaled over their respective ranges of 0 to 10 VDC and
0 to 20mA. For example, when the voltage output (ter-
minal 2) is at 0 VDC, the current output (terminal 1) is
at 0mA. A 10 VDC output produces a 20mA output. a
5 VDC output produces a 10mA output, etc.
To test an output, each output can be manually set to
any desired value within its range limits. The desired
value is set in terms of a voltage value. For example,
if the voltage is set to 5 VDC, the current value will
automatically be set to 10mA. When Diagnostic Mode
is exited (DIP Switch 3 is set back to OFF position),
outputs revert to Program control.
To manually set the output:
1. Press the SELECT ANALOG OUTPUT key, A
green box will be placed around the first change
-
able output.
2. Use the keypad UP and DOWN arrow keys to
place the green box around the desired output.
3. Press the ENTER (
) key. A box will appear
showing the range of allowed voltage values.
4. Using the keypad keys, enter the desired voltage
value.
I/O BOARD (031-02895-000) DIAGNOSTIC SCREEN
(SOFTWARE VERSION C.OPT.01.21.307 AND LATER)
LD14329
FIGURE 110 -
I/O BOARD DIAGNOSTIC SCREEN