X11CB INSTALLATION AND OPERATION
2.4.14.
Field Contact Wiring Diagrams
The following describes each field contact arraignment. For wiring diagrams refer to
section 2.7 Wiring Instructions of this manual
Dry contact
:
The field contact connection type provides an internal
interrogation voltage of 24 VDC. This is a non isolated field contact connection where
no external field contact voltage is required.
Illustration 19: Dry Field Contact Schematic
Live contact with isolation: This field contact connection type requires an
external power source for the field contacts. To provide isolation the connections are
only made at the field contact terminals.
Illustration 20: Live Field Contact Schematic (Isolated)
Live contact without isolation: This field contact connection type requires an
external power source for the field contacts and provides no isolation. The Field
contact negative voltage (ground) is connected to the systems negative voltage
terminal (V- or ground) for all field contact returns.
X11CB-3031-IOM
25
DRY FIELD CONTACT SCHEMATIC
Non-isolated
FC
+24VDC
SYS
SYS GND
SYS GND
FILED CONTACT INPUT
OPTO ISOLATOR
INPUT CARD
LIVE FIELD CONTACT SCHEMATIC
Isolated
FC
(H)
(FC)
FCV+
FCV-
SYS GND
FILED CONTACT INPUT
OPTO ISOLATOR
INPUT CARD
