DL205 Analog Manual, 7th Edition Rev. D
6-7
Chapter 6: F2-04RTD 4-Channel RTD Input
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Connecting the Field Wiring
Wiring Guidelines
Your company may have guidelines for wiring and cable installation. If so, check the
guidelines before beginning the installation. Here are some general things to consider:
• Use the shortest wiring route whenever possible.
• Use shielded wiring and ground the shield at the transmitter source. Do not ground the
shield at both the module and the source.
• Do not run the signal wiring next to large motors, high current switches, or transformers.
This may cause noise problems.
• Route the wiring through an approved cable housing to minimize the risk of accidental
damage. Check local and national codes to choose the correct method for your
application.
To remove the terminal block, disconnect power to the PLC and the field devices. Pull
the terminal block firmly until the connector separates from the module.
You can remove the RTD module from the PLC by folding out the retaining tabs at the
top and bottom of the module. As the retaining tabs pivot upward and outward, the
module’s connector is lifted out of the PLC socket. Once the connector is free, you can
lift the module out of its slot.
Use the following diagram to connect the field wiring. If necessary, the F2–04RTD
terminal block can be removed to make removal of the module possible without
disturbing field wiring.
RTD - Resistance Temperature Detector
Use shielded RTDs whenever possible to minimize noise on the input signal. Ground the
shield wire at one end only, preferably at the RTD source.
Lead Configuration for RTD Sensors
The suggested three-lead configuration shown below provides one lead to the
CH+ terminal, one lead to the CH– terminal, and one lead to the common terminal.
Compensation circuitry nulls out the lead length for accurate temperature measurements.
Some sensors have four leads. When making connections, do not connect the second
lead to the CH+ input; leave that lead unconnected.
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Red
White
White (if applicable)
To CH--
To CH+
No Connection
To COM
Do not use configurations that lack
the use of the same color lead to both
the CH– and COM terminals. There
is no compensation and temperature
readings will be inaccurate.
This module has low RTD excitation
current, the worse case dissipation
with 100q RTDs connected is only
0.016 mW.
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