Spectrum Controls 1756sc-OF8H Series A - Manual (Page 18)

4 ControlLogix ™ Analog HART Modules
Module Operation
The 1756sc-IF8H module’s input circuitry consists of eight differential-
ended analog inputs, multiplexed to two A/D converters. The A/D
converters read the analog input signals and convert them to floating point
values.
The 1756sc-OF8H has 8 channels that are routed to two quad D/A
converters which output the control signal.
HART communication is independent of the analog operation. Each of the
eight channels are multiplexed to one modem.
Compatibility with Current Devices and Cables
The modules are compatible with a variety of voltage and current devices
with an input or output 0-5V, 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 1.4 Recommendations to minimize
interference from radiated electrical noise
For This Type of Device We Recommend This Cable (or equivalent)
V, mA devices Belden 8761, shielded, twisted-pair