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ROC800-Series Instruction Manual
Revised Jul-14
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 Number D301250X012 or the
ROCLINK 800 Configuration Software User Manual (for ROC800L),
Part Number 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.
Caution
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.
Figure 4-9. Discrete Input Module Field Wiring
Caution
You can induce ground loops by tying commons from various modules
together.
+
-
DRY CONTACT
ROC800 POWERED
+
-
+V
6.6KW
DOC0507A
COM
6
8
7
4
5
3
2
1
DI
8 CHAN
OPEN DRAIN TYPE DEVICE
OR
OPEN COLLECTOR
EXTERNALLY POWERED