The Rockwell Automation 1756-IF16 is a non-isolated analog current/voltage I/O module. In order to connect to a ControlLogix chassis, it requires an RTB, or a removable terminal block housing, of either the 1756-TBS6H or 1756-TBCH. This input module has 16 points available. These points allow users to wire the module in different ways, unlike other modules. The 1756-IF16 can be wired using three different methods, depending on the user's and application's requirements: single-ended wiring, differential wiring, and high-speed mode differential wiring. The single-ended wiring method is best when all input devices are tied to a common ground. This is for comparing one side of the signal input to signal ground to get the difference, which is then used by the module in generating digital data for the controller. 16 single-ended wirings can be done. When applications do not have a common ground or can have separate signal pairs, using the differential wiring method is recommended. This wiring method is also for environments where an improved noise immunity is needed. The channels in a differential mode are not completely isolated from each other.

One channel may affect the reading of another channel if multiple differential input signals have different voltage common references. When this happens, users should wire the input on different modules or replace the non-isolated module with an isolated input module. Eight (8) connections are allowed in this mode. Lastly, the high-speed mode differential wiring method allows for the fastest possible data updates. However, certain conditions are required for users to be able to use the high-speed mode. First, it uses the differential wiring method. Second, when in this mode, only one of every four channels on the module can be used. The power consumption of the 1756-IF16 module is 2.3 Watts and it has a total backplane power of 2.33 Watts. The input range is ± 10 Volts, from 0 to 10 Volts, 0 to 5 Volts, or 0 to 20 milliamperes. The current draw of this module at 5.1 Volts is 150 milliamperes, or is 65 milliamperes at 24 Volts. The voltage and current ratings of the backplane are 5.1 Volts DC, 150 milliamperes at maximum, and 24 Volts DC 65 milliamperes at maximum. The input current range is from 4 to 20 milliamperes and the input voltage range is from -10 to 10 Volts and limited to 100 Volt-amperes. The Voltage power dissipation is around 2.3 Watts and the current power dissipation is 3.9 Watts. The thermal dissipation for the voltage is 7.84 British Thermal Units (BTU) per hour and 13.3 BTU per hour for current. It also has a maximum overvoltage protection of 30 Volts DC (voltage) and 8 Volts DC (current).