Analog Inputs; Internal Analog Inputs; I/O Analog Inputs - Control Microsystems SCADAPack 350 Hardware Manual

5

Analog Inputs

The SCADAPack 350 provides eight analog input channels. This comprises of six single ended
analog inputs available for external wiring and two internal for monitoring of onboard controller
variables. The external inputs provide 15-bit resolution over the range of the input. Five external
inputs can be configured for voltage or current mode. The sixth external input is configured for
voltage mode only and will measure 0 to 32.768V. This input can be used to monitor the input
power or a battery voltage. Wiring of the external outputs is covered in this section of the manual.
The two internal inputs can be used in a user application to monitor, RAM battery voltage, controller
board ambient temperature and DC\DC converter voltage used for VLOOP. See the following
sections for details on how to access
Input
0 to 4
5
6
7
Refer to the TelePACE or ISaGRAF software manuals for information on how to use the
SCADAPack 350 Analog Outputs in application programs. Access to the analog output registers is
achieved using a Register Assignment in TelePACE or I/O connection in ISaGRAF.
5.1

Internal Analog Inputs

Two internal analog inputs which measure the controller board ambient temperature and NV-RAM
battery voltage can be accessed from a 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°C to 75°C or –40°F to 167°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

Six single ended analog inputs are available for measurement of field data. These analog inputs
provide 15-bit resolution over the entire range of the input. The analog inputs identified as Channel 0
SCADAPack 350 Hardware Manual
February 14, 2007
Type Description
external Jumper selectable for 0-10V or 0-40mA inputs.
external 0-32.768V for battery monitoring
internal DC/DC converter output voltage
internal Used internally by SCADAPack 350.
16