Xylem System 5000 User Manual - Manual (Page 77)

Outputs
75
This option allows for a specified current (4, 12, or 20mA) to be constantly applied to the loop
for up to 5 minutes. The Test can be stopped at any time after it has been started. This test can be
useful to verify everything is functioning as expected on the 4-20mA current loop.
Force Current (5 min)
The Digital I/O Ports are located on the
lower first block of the front panel.
Digital ports can be configured as either
Inputs or Outputs and will automatically
be configured based on how the System
5000
™
is set up. If a pin is configured
as a Digital Out, the value will be a 1
or a 0 based on whether the Condition
evaluates as a true (greater than zero)
or false, “On” or “Off” respectively.
Logical Conditions, such as HG > 0,
are suggested, as they return a simple
true or false response. Calculations that
return a positive or negative number are
Digital Out
also allowed, evaluating any positive number as true and zero or less as false.
Be aware that though the Digital Output may be set to a 1 or a 0, 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.
If the Conditional Type is unchecked, the Output will always be run (as though the Condition
statement evaluated to true). The Digital Port will simply be set to 1 (High) when the Task Output is
run in this manner. The On For Scan Mode, described below, operates regardless of the Conditional
statement.
Defines which port is currently being measured and will be used as the Task Value.
Port
Shows the current value of the selected port. Note that this value is only read when the screen is
loaded or a new Port is selected. To re-read the current value, press the Test button. To toggle the
current value of the selected Port (change from 1 to 0 or 0 to 1), press the Toggle button.
Value
Three modes of operation are available for a digital output. Normal and Pulse run as standard
Task Outputs while On For Scan operates during the scanning process.
Mode