Honeywell HC900 - Figure 39 - Universal Analog Input Wiring Diagram

I/O Module Installation and Wiring - I/O Terminal Block Wiring Diagrams
Revision 19 HC900 Process Controller Installation and User Guide 83
06/14
OHMs Inputs
Ohms inputs are wired similar to 2-wire RTD inputs. That is, they require a current source, and thus must
use one of the I
RTD
current sources. Also, two terminals are jumpered together as they are for two-wire
RTD inputs.
Analog channels wired for Ohms inputs differ from RTD inputs in these aspects:
• Ohms inputs connect to variable resistance devices other than RTDs, and
• Ohms inputs are configured in Designer Software as Ohms inputs, rather than as RTD inputs.
Examples of wiring for resistance inputs are given in Figure 42 .
Shield Grounding
Shields must be grounded as described under Shield Grounding at the beginning of this section.
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.
Figure 39 – Universal Analog Input Wiring Diagram