5 Analog Inputs
There are six single ended analog inputs available to the user. These inputs provide 15-bit resolution
over the range of the input. Five of these inputs are selectable for voltage or current inputs. One of
these inputs is a 0 to 32.768-volt input and can be used to monitor battery voltage.
In addition to these analog inputs there are internal analog inputs available to the user. These analog
inputs are used in application programs to monitor, RAM battery voltage, controller board ambient
temperature and DC\DC converter voltage used for VLOOP.
Input Type Description
0 to 4 external Jumper selectable for 0-10V or 0-40mA inputs.
5 external 0-32.768V for battery monitoring
6 internal DC/DC converter output voltage
7 internal Used internally by SCADAPack LP.
Refer to the appropriate software manual for information on using the SCADAPack LP Analog
Inputs in application programs. For TelePACE applications refer to the Register Assignment for
SCADAPack LP I/O module and for ISaGRAF applications refer to the I/O Complex Equipment for
SCADAPack LP I/O.
5.1 Internal Analog Inputs
SCADAPack LP Controllers have two internal analog inputs. These internal analog inputs are
accessed from the user application program.
The ambient temperature input measures the temperature at the controller circuit board. It is useful
for measuring the operating environment of the controller and returns an integer value in the range –
40 to 75 deg C or –40 to 167 deg F. The temperature reading represents temperatures in the range -
40°C to 75°C or -40°F to 167°F. Temperatures outside this range cannot be measured.
• For TelePACE applications use the AIN Controller Temperature register assignment to read the
ambient temperature in degrees C and degrees F.
• For ISaGRAF applications use the aintemp I/O connection to read the ambient temperature in
degrees C and degrees F.
The lithium battery input measures the voltage of the battery that maintains the non-volatile RAM in
the controller. The reading returned from this input is in the range from 0 – 5000 representing the
battery voltage in mV. It is useful in determining if the battery needs replacement. The 3.6V lithium
battery will return a typical value of 3600 or 3700. A reading less than 3000 (3.0V) indicates that the
lithium battery requires replacement.
• For TelePACE applications use the AIN Controller RAM Battery V register assignment to read
the lithium battery voltage.
• For ISaGRAF applications use the ainbatt I/O connection to read the lithium battery voltage.
5.2 I/O Analog Inputs
There are six single ended analog inputs available to the user. These analog inputs provide 15-bit
resolution over the entire range of the input. The analog inputs are transient protected and share a
common return (GND) that is connected to the chassis. Refer to Figure 2: SCADAPack LP Board
Layout for the location of P9.
SCADAPack LP Hardware Manual
May 26, 2006
13
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