Spectrum Controls 1756sc-IF8u - Manual (Page 18)

6
ControlLogix ™ Counter Module
Compatibility with
Thermocouple,
Current, and Millivolt
Devices & Cables
The module is compatible with the following standard types of
thermocouples: B, E, J, K, N, R, S, T and C and extension wire. Refer to
appendices B and C for details. The module is also compatible with a
variety of voltage and current devices with an output of ±50, ±150 mV, 0-
5V, 1-5V, 0-10V, ±10V, 0-20mA, and 4-20mA. To minimize interference
from radiated electrical noise, we recommend twisted-pair and highly
shielded cables such as the following:
Table 1.7 Recommendations to minimize interference from radiated
electrical noise
For This Type of Device We Recommend This Cable (or equivalent)
Thermocouple Type J EIL Corp. J20-5-502
Thermocouple Type K EIL Corp. K20-5-510
Thermocouple Type T EIL Corp. T20-5-502
Other Thermocouple Types consult with EIL Corp or other manufacturers mV, V, mA devices Belden 8761,
shielded, twisted-pair Compatibility with RTD and Resistance devices and cables
The module is compatible 100. Platinum 385, 200. Platinum 385, 500.
Platinum 385, 1000. Platinum 385, 100. Platinum 3916, 200. Platinum 3916,
500. Platinum 3916, 1000. Platinum 3916, 10. Copper 426, 120. Nickel
618 and 120. Nickel 672 RTD types and resistance inputs, and 3 possible
wire types (2 wire, 3 wire, or 4 wire). Each RTD input individually
supports three input pins on the terminal block: one excitation current
source (EXC+), one sense positive (IN+) and one sense negative (IN-).
Only those pins are connected that are required by the selected RTD or
resistance wire type. For 2, 3, or 4 wire configurations, the module can
support a maximum combined cable length associated with an overall
cable impedance of 25 ohms or less without exceeding its input limitations.
The accuracy specifications provided herein do not include errors
associated with unbalanced cable impedance.
Since the operating principle of the RTD and resistance inputs is based on
the measurement of resistance, take special care in selecting your input
cable. For 2-wire or 3-wire configuration, select a cable that has a
consistent impedance throughout its entire length. For 2-wire
configurations, we recommend that you use Belden #9501 (or
equivalent). For 3-wire configurations, we recommend that you use
Belden #9533 (or equivalent) for short installation runs (less than 100
feet) or use Belden #83503 (or equivalent) for longer runs (greater than
100 feet) and in high humidity environments.