22
Dymax BlueWave® LED Flood System User Guide
Input Signal Definition
Note:
Asserting an input signal means connecting the input pin to return. Approximately 3mA will flow out of
the pin. The current is supplied from the +24VDC Supply. Un-asserting an input signal means that less than 1
microampere of current is drawn from the pin.
NOTE
: All Input signals are ignored until the Flood Unit is placed in PLC mode.
Table 1 Input Signals to the Flood Unit on the PLC Interface
Name
Pin Number
Definition and Notes
+24 VDC input
1
P24VDC +/- 10% to this pin
+24 VDC Return/
Signal Common
2
Return for all signals on the on the PLC. This signal is optically isolated
from any AC power and Protective Earth.
PLC Interface Enable
3
The PLC should assert this signal after all other signal outputs by the PLC
program are valid. The unit will not respond to PLC control if this signal is
not asserted
LED Activation
Request
4
The PLC should assert this signal to command the LED to turn on.
Inhibit LFA
5
When asserted, this signal will prevent the LED from turning on when the
system is in PLC mode, no matter what the state of other PLC input
signals are. Also, the LED will not turn on if the front panel Run key is
pressed in PLC Mode.
Intensity Selection
6
This signal is used to tell the Flood Unit to set the intensity using the
entry in the front key panel or to set intensity using the Intensity Control
signal below. When asserted or wired to signal common, the intensity will
be controlled by the PLC. If left unconnected, the intensity will be
controlled by the entry on the front key panel.
Note- It is more useful to keep this signal disconnected from the PLC and use
it as a fixed connection to Signal Common or disconnected from all other
signals, depending upon on the desired intensity control method.
Note- The PLC Screen will always show the current LFA intensity, no matter
which method is used to control intensity
.
Intensity Control
20
This signal provides a means for the PLC to directly control LFA intensity.
The PLC output must be a contact closure to signal common, switching at
2KHZ, with a duty cycle of 0 to 100%.
Note- Instructing the PLC to leave contact open all of the time is a command
to have the LFA operate at 100% of rated intensity
.
Note- Instructing the PLC to leave the contact fully closed is a command to
have the LFA operate at minimum intensity. The minimum intensity varies
with LFA part number
Note- to simplify interfacing and to reduce troubleshooting time, the state of all PLC signals and the Intensity of
the LFA are reported on the screen of the LCD.
