Figure 64 - Contact Input Wiring Diagram - Honeywell 900U02-0100 User And Installation Manual

Contact Input Module Wiring
The Contact Input Module has sixteen inputs in one group. An example of Contact Input wiring is shown
in Figure 64. SIL applications require an external blocking diode used to insure inputs are protected from
ground faults. See ControlEdge HC900 Process & Safety Controller Safety Manual for additional details.
Specifications for the Contact Input Module and other modules are given in the Specifications manual.
Internally Powered Input Channels
The Contact Input Module provides voltage to the field contacts.
CAUTION
Do not apply any external power to the field device or to the input terminals. Doing so
could damage the module.
Common terminals
Four common terminals are provided for the 16 inputs. Terminals 9, 10, 11, and 12 are connected in the
Contact Input module.
Hazardous voltages exist at terminal blocks.
 Using switches at field devices disconnect the field wiring from power sources before servicing.
Failure to comply with these instructions could result in death or serious injury.
114 ControlEdge HC900 Process & Safety Controller User and Installation Manual
Figure 64 – Contact Input Wiring Diagram
Revision 10
May 2019