5604 Input/Output (I/O) Module - Hardware Manual
October 19, 2007
5 Analog Inputs
The 5604 I/O module enhances the capacity of a SCADAPack controller by providing an additional
nine single ended analog inputs on connector P4, that can be configured for current or voltage mode.
Refer to Figure 1: 5604 I/O Module Layout for the location of this connector.
Analog Inputs 0-7 can be configured for current or voltage mode using jumper switches. Please refer
to section 5-Analog Inputs on how to select input modes.
In voltage mode, these analog inputs are single ended and the measurement range is 0-10V. The
range is selected via the configuration DIP switches. Refer to section 5.2- Range and
Resolution below for details.
In current mode, a 250 current sense resistor appears across each analog input channel.
Measurement range in current mode is 0-20mA or 4-20mA selectable via the configuration
switches. The 250 resistor produces a voltage drop (input reading) of 5V for a 20mA of
current flow.
All analog input channels are transient protected, optically isolated from the main logic supply and
share a common return (COM) that is connected to the chassis.
The controller uses a 16-bit successive approximation analog to digital (A/D) converter and provides
15 bit resolution over the range of the analog input.
Analog Input 8 is a 0 to 32.768-volt input that measures with 10-bit resolution and can be used to
monitor a power supply or battery voltage.
There is one internal analog input that is used in application programs to monitor the DC/DC
converter voltage used for VLOOP.
For TelePACE applications use the SCADAPack 5604 I/O Module register assignment to read
the nine external and the internal analog inputs.
For ISaGRAF applications use the sp5604 I/O connection to read the nine external and the
internal analog inputs.
Please refer to the respective TelePACE and ISaGRAF software manuals on how to assign the above
registers to read these input ports.
5.1 Current or Voltage Mode
Analog Inputs 0-7on connector P4 can be configured for either voltage or current mode using
jumper links. The jumper links reside on the lower I/O board itself. To access the jumper links, the
main cover and controller board will have to be taken off by removing the retaining screws.
Note: Analog Input channels 0-7 are configured for current mode by default.
To select current mode, install the jumpers on the side labeled 20mA on the I/O board as shown in
the figure below for analog inputs 0-5. In current mode a 250 resistor appears across the input
channel.
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