MAN1032-10-EN_EXL6_UserManual
March 12, 2020
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Protection for Inductive Loads
Inductive loads can cause reverse currents when they shut off that can shorten the life of relay
contacts. Some protective measures need to be determined by an engineer. If you have
questions on protection from inductive load, contact Technical Support. Details on devices that
may protect outputs can be found in MAN0962.
Output State on Controller Stop
When the controller is stopped the operation of each output is configurable. The outputs can
hold the state they were in before the controller stopped or they can go to a predetermined
state. By default, relay outputs turn off. For more information on stop state see the Index for
Cscape settings pages.
8.6 Digital Inputs
NOTE: Refer to the datasheet for EXL6 OCS model being used for details on jumper settings.
NOTE: The digital inputs on the EXL6 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 12 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 EXL SERIES OCS can be wired for Positive Logic inputs or
Negative Logic inputs.
