Selecting Temperature Or Counts - Automation Direct DL405 User Manual

8–6
F4–08THM–n 8-Channel Thermocouple Input
Selecting
Temperature
or Counts
Connecting the Field Wiring
Wiring Guidelines
User Power
Supply
Requirements
The jumper closest to the bottom of the
module selects between conversion to
units of temperature or to a binary count
ranging from 0 to 4094.
For Temperature format, remove the
jumper.
For Counts format, install the jumper.
Remember, –3, –2, and –1 input range
versions do not have this jumper.
Your company may have guidelines for wiring and cable installation. If so, you
should check those before you begin the installation. Here are some general things
to consider.
S
Use the shortest wiring route whenever possible.
S
Use shielded wiring and ground the shield at the signal source. Do not
ground the shield at both the module and the source.
S
Do not run the signal wiring next to large motors, high current switches,
or transformers. This may cause noise problems.
S
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.
The F4–08THM–n requires a separate power supply. The CPU, D4–RS Remote
I/O Controller, and D4–EX Expansion Units have built-in 24 VDC power supplies
that provide up to 400mA of current. You can use this supply to power the
Thermocouple Input module. If you already have modules that are using all of the
available power from this supply, or if you would rather use a separate supply,
choose one that meets the following requirements: 24 VDC $10%, Class 2, 50mA
current.
Temperature/
Counts