Control Microsystems SCADAPack LP - Digital Inputs

8 Digital Inputs
The SCADAPack LP I/O Module provides eight universal digital inputs and outputs. The inputs are
for use with dry contacts such as switches and relay contacts. The SCADAPack LP provides the
wetting current for the contacts.
If LED power is enabled, the SCADAPack LP continuously sources approximately 5mA wetting
current into each dry contact input. Indicator LEDs will be at their maximum brilliance if on. This
facilitates field service and diagnostics.
If LED power is disabled then the wetting current is turned on only when the digital inputs are
scanned by the SCADAPack LP. Power consumption is reduced as the inputs are scanned only once
every millisecond. Indicator LEDs are dim in this condition. This is normal.
Refer to the appropriate software manual for information on using the SCADAPack LP Digital
Inputs and Outputs 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.
The SCADAPack LP I/O Module provides the following digital inputs.
Input Type Description
0 to 7 external Dry contact inputs. These inputs are located on terminal P3.
0 = contact open (associated is LED off)
1 = contact closed (associated is LED on)
8 internal Not for use in applications. Internal use only.
9 internal Com3 (HMI) power output status
0 = off
1 = on
See section 4.2.1-COM3 Serial Port Power Control for
details.
10 internal VLOOP output status
0 = off
1 = on
See section 4.2.2- VLOOP Power Control for details.
11 internal DC/DC converter status
This bit reports the true status of the DC/DC converter. If
over-current causes the converter to be turned off, this bit
will clear.
0 = off
1 = on
See section 4.2.3-12V to 24V DC/DC Converter Control for
details.
12 internal VLOOP over-current status
Indicates VLOOP over-current has been detected. This input
clears when VLOOP output is off, or the over-current
condition clears.
0 = off
1 = on
See section 4.2.2.1-VLOOP Over-Current Protection
section for details.
13 internal Digital output mismatch
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SCADAPack LP Hardware Manual
May 26, 2006
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