Horner APG XLt OCS - Manual (Page 37)

MAN0878-04-EN CH. 9
August 12, 2009 Page 37 of 100 ECN # 979
9.6
Digital Inputs
Note: See CHAPTER 10 for high speed I/O information and refer to the datasheet for XLe/XLt model you
are using for details on jumper settings.
Note: The digital inputs on the XLe/XLt are designed for low voltage DC inputs. The inputs are
designed to support both positive and negative input modes. The mode is set by a jumper setting
and a configuration parameter in Cscape. All the inputs on the unit must be configured to the
same mode.
Figure 9.5 – Positive and Negative Inputs
In positive logic mode a positive voltage applied to the input will turn the input. The internal design of this
mode is basically a resistor from the input to I/O ground. This mode is sometimes called sourcing.
In negative logic mode, connecting the input to the I/O ground or zero volts will turn the input on. The
internal design of this mode is basically a resistor from the input to the positive I/O voltage (usually 12 or
24 volts). This mode is sometime called sinking.
Some of the digital inputs may support high speed input functional such as counting or frequency
measurement.
9.7
Analog Inputs
Note: See the data sheet for the XLe/XLt model you are using for jumper settings and CHAPTER 14 for
details on how to use Cscape to configure the digital filtering.
The analog inputs on the XLe/XLt allow voltage or current measurement from a variety of devices. The
voltage or current mode is set though jumpers on the unit and settings in Cscape. Each channel can be
separately configured for voltage or current mode.
The analog inputs have a digital filter that can be used to filter electrical noise that may be unavoidable in
some installations. The downside to digital filtering is the inputs will respond more slowly to sudden
changes in the actual input.
I1
0V
001XLE036
12-24VDC
I1
0V
Positive Logic In Negative Logic In
Positive Logic vs. Negative Logic Wiring
The XLE/XLT can be wired for Positive Logic inputs or Negative Logic inputs.