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Figure 119: Digital Outputs
Active High and Active Low Signal
In the system, digital signals are specified as either Active High
or Active Low
. An Active
High output means that the pin assigned to the output will be turned on when the function assigned to the
pin is active. An Active Low output means that the pin assigned to the output will be turned off when the
function assigned to the pin is active.
For example, with the
Standby
signal shown above configured as active high, the output pin number 5 will
be switched on (24Vdc) when the machine is in a standby state.
Table 38 below lists the signals available on the
Digital Outputs
Signals screen and a brief description of
their function.
Table 38: Digital Outputs
Digital Outputs
Signal Name
Function
Standby
This signal indicates that the machine is in an enabled state, but is not running the
motor.
Automatic Operation
This signal indicates that the machine is enabled and the motor may be stopped or
running. The machine can start up at any time.
Motor Running
This signal indicates that the main motor is running.
Loaded State
This signal indicates that the compressor is loaded and producing air (inlet valve is
open).
Unloaded State
This signal indicates that the compressor is unloaded (inlet valve is closed).
Blowdown State
This signal indicates that the compressor is in the blowdown state. On some
machines, this is the same as the unloaded state, but machines that have direct
control over the blowdown valve may run unloaded prior to depressurizing the
reservoir.
Maintenance Alarm
This signal indicates that the machine requires maintenance or service. An active
warning for a service item has been detected. This may be due to a condition-based
alarm (such as Air Filter vacuum), or a maintenance timer / counter.
Warning / Maintenance
This signal indicates that a warning or maintenance alarm is present on the system.