Control Microsystems SCADAPack 350, Hardware Manual

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7 Digital Outputs
The SCADAPack 350 controller board provides eight universal digital inputs or outputs. Outputs are
open-collector/open drain type for use with sustained DC loads up to 1 ampere. Higher peak loads
can be tolerated.
The negative side of the load is connected to the desired terminal on the controller terminal block P3.
The positive side of the load connects to a power supply. When the load is on the load current is
switched through the controller to terminal labeled GND. GND must be connected to the negative
side of the power supply.
Inductive load transient suppression is built into each digital output point. It is not necessary to add
additional inductive load transient suppression unless highly inductive loads (greater than 1H) are
operated continuously at greater than 0.5Hz.
The SCADAPack 350 also provides three internal digital outputs that can be controlled by the user
application to manage power saving features unique to the SCADAPack 350.
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.
The following table describes the SCADAPack 350 digital outputs.
Output Type Description
0 to 7 external Open drain outputs. These outputs are located on terminal
P3.
0 = output transistor off
1 = output transistor on
8 internal VLOOP power control
0 = off
1 = on
See section
4.4.2-VLOOP Power Control
for details.
9 internal DC/DC converter control
0 = off
1 = on
See section
4.4.3- 12V to 24V DC/DC Converter Control
for details.
10 internal com3 (HMI) power control
0 = off
1 = on
See section
4.4.1-COM3 Serial Port Power Control
for
details.
SCADAPack 350 Hardware Manual
February 14, 2007 21