Xylem XL Series H-522 - Plus - Manual (Page 104)

12-2 Digital I/O
XL™ Series
PC Menu screen: Digital I/O Options.
Digital I/O Setup (Esc to Return)
Digital I/O #1 = 1
A - I/O Mode = Digital Input
B - Trigger When = 0
C - Pulse Length = 1000 ms
D - Warm Up Delay = 250 ms
1 - Test Output 1
Digital I/O #2 = 1
E - I/O Mode = Digital Input
F - Trigger When = 0
G - Pulse Length = 1000 ms
H - Warm Up Delay = 250 ms
2 - Test Output 2
O - Encoder Out Source: None
V - Encoder Value = 0.000
S - Encoder Slope = 0.010
Enter Option >
12.3 Digital I/O Options
PC Interface View Built In Display Screen
Digital I/O #1 = 1 Digital I/O 1 = 1
This screen gives the current state of the digital I/O pin. If the pin is configured as an input, the
value will be a 1or a 0 meaning “On” or “Off” respectively. If the pin value is a 1, the input
voltage will be approximately 3.5 volts or higher, (normally 5.0 volts). If the pin value is a 0, the
input voltage will be approximately 0.8 volts or less, (normally 0.0 volts). The range between 0.8
and 3.5 is not defined and may be either a 1 or a 0.
If the pin is configured as an output, the value will be a 1 or a 0 based on whether the output is
set to a 1 or a 0, “On” or “Off” respectively. However, the output may be set to a 1 or a 0, but the
connected equipment may prevent the output from going to the desired state if it is causing too
great a load on the output. In this case the reported value matches the desired state and not the
actual state. Other functions for this screen are available based on the mode of the I/O pin as
listed below.
NOTE: The following statements relate only to the built in keypad / display.
When Configured As An Input
Pressing the ENTER key will display “Digital Input Mode”, indicating the current pin
configuration is an input.