MAN0974-14-EN_XL7_XL7P_UM
July 6, 2022
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8.6
Digital Inputs
NOTE:
Refer to the datasheet for XL7/XL7 PRIME OCS model being used for details on jumper settings.
NOTE:
The digital inputs on the XL7/XL7 PRIME 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.
