MAN0974-13.1-EN_XL7_UM
August 19, 2021
Page 84 | 198
8.6 Digital Inputs
NOTE: Refer to the datasheet for XL7 OCS model being used for details on jumper settings.
NOTE:
The digital inputs on the XL7 OCS 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 8.6
–
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 12V or 24V). This mode is sometimes
called “sinking”.
Some of the digital inputs may support high-speed input functional such as counting or
frequency measurement.
I1
0V
001XLE036
12-24VDC
I1
0V
Positive Logic In Negative Logic In
Positive Logic vs. Negative Logic Wiring
The XL SERIES OCS can be wired for Positive Logic inputs or
Negative Logic inputs.
