Revision 10 ControlEdge HC900 Process & Safety Controller User and Installation Manual 95
May 2019
6.7. I/O Terminal Block Wiring Diagrams
Universal Analog Input Module Wiring
The Universal Analog Input Module has eight inputs, which can include any combination of the
following input types: RTD, TC, Ohms, Millivolt, Volt, or Milliamp. Figure 47 shows wiring examples of
each of the analog input types. An example of wiring for eight TC inputs is given in Figure 49.
Specifications for this module and for other modules are given in the Specifications section of this
manual.
ATTENTION
To indicate sensor failure the Analog Input software will output a warning if
thermocouple resistance > 80 ohms. Use appropriate gauge wiring to prevent
inaccurate failure warnings.
Table 15 – Typical Thermocouple resistance in Ohms per Double Foot @ 68 degrees F
Table values are shown as a reference only; actual values may vary. Consult manufacturer specifications.
Isolation
This module has eight inputs, which are isolated except for RTD current sources.
RTD Inputs
RTD inputs share current sources (two RTD inputs per source), as shown in Figure 46, Figure 47 and
Figure 48.
For example, the current source for the RTD input at channel one (terminals 1 and 2) is terminal 3 (I
RTD
1 & 2). This same current source (I
RTD
1 & 2) is also used for an RTD input at channel two (terminals 4
and 5).
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