12V to 24V boost
ON/OFF
Dout 11
P10 - Vloop
P2
I/O Expansion
5V supply
P3 – Power In
Dout 10
Sleep = open
P5 – COM1
RS-485
P7 – COM2
RS-232
P8 – COM3
RS-232
Dout 9
J13
5305 Analog
Output Module
Figure 3: Power Management
4.2.1
COM3 Serial Port Power Control
The COM3 serial port is intended for use with the SCADAPack Vision or other Human Machine
Interface (HMI). Pin 1 of the RJ-45 connector provides switched 5-volt power for the SCADAPack
Vision or other HMI.
section for information on COM3 and section
section for wiring examples. HMI power is controlled in the
following ways.
•
When internal
Digital Output 9
is
ON
HMI power is turned on.
•
When internal
Digital Output 9
is
OFF
HMI power is turned off.
•
HMI power is turned on for five minutes when a momentary contact is made between pin 2
(DCD) and pin 3 (DTR) on the COM3 RJ-45 connector. This permits the SCADAPack Vision or
an HMI pushbutton to control HMI power. At each momentary contact, the five-minute power
timer is reloaded. If the five-minute power timer is maintaining the HMI power on, a sustained
two-second or longer contact between DCD and DTR will turn off HMI power. Refer to section
for more information.
Internal
Digital Input 9
indicates the status of COM3 serial port power. Digital Input 9 is set when
COM3 serial port power is on and is cleared when COM1 serial port power is off.
HMI power is turned on whenever the LED power is enabled. This feature is provided for service
and diagnostics. Refer to section
for further information on this feature.
4.2.2
VLOOP Power Control
The DC/DC converter output can be used to power analog input current loops or other
instrumentation. This output, VLOOP, is controlled for intermittent or continuous operation. Turning
the VLOOP output off when it is not required can save considerable electrical power.
SCADAPack LP Hardware Manual
May 26, 2006
11
