ROC800-Series Instruction Manual
Revised July-2017 Input/Output Modules 4-11
The DI module provides a source voltage for dry relay contacts or for an
open-collector solid-state switch.
The DI module’s LEDs light when each input is active.
Each DI channel can be software-configured to function as a momentary
or latched DI (see the ROCLINK 800 Configuration Software User
Manual (for ROC800-Series) (part D301250X012 or the ROCLINK 800
Configuration Software User Manual (for ROC800L) (part
D301246X012). A latched DI remains in the active state until reset.
Other parameters can invert the field signal and gather statistical
information on the number of transitions and the time accumulated in
the on- or off-state.
The Discrete Input module is designed for use with “dry” relay contacts
or solid-state switches. Applied voltage in excess of 24 Vdc may
damage the module.
The DI module senses the current flow, which signals the ROC800
electronics that the relay contacts have closed. The opening of the
contacts interrupts the current flow and the DI module signals the
ROC800 electronics that the relay contacts have opened. Using
ROCLINK 800, you can set the scan rate between 4 and 43200
milliseconds.
The left side of Figure 4-9 displays the internal circuitry while the right
side displays possible field wiring.
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