Micromod RetroPAK: SLC Installation Manual - Manual (Page 56)

SLC RetroPAK Controller
POWER, GROUNDING, AND BUILT-IN I/O CONNECTIONS
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3.5.5 Built-In Resistance Input
The resistance input can be used to monitor a resistance which changes in proportion to a
process related value such as a set-point. Make resistance input connections as shown in
Figure 3-7.
The resistance input can also be used for a 2-wire RTD, which is not on the list of supported
RTDs in Section 4.3.6. Make the 2-wire RTD connections as shown in Figure 3-4. When
using an RTD not supported by the instrument software, the database must be configured to
provide a user defined linearization using the Application Builder Software. Refer to Section
1.1.2 Related Documents.
to Chassis
Terminal
to instrument
ground
Figure 3-7. Built-In Resistance Input Connections
Resistance input specifications are:
Range: Configurable
• Normal Range: 0 to 430 ohms
• Low Range: 0 to 55 ohms
Resolution: less than 0.004 ohms
Accuracy: ±0.05% of input resistance or 0.1 ohms whichever is greater