1771-IXEK

The Allen-Bradley 1771-IXEK is a Conformal-Coated PLC 5 Analog Input Module. Conformal coatings are polymeric films which protect the module from humidity and contaminants. It is a thermocouple/millivolt input module for transferring input data words from its memory to the PLC processor’s data table and transfer back configuration words using block transfer programming. The 1771-IXEK requires a single slot for installation in a 1771 I/O chassis and needs no external power supply. The 1771-IXEK module has 8 floating differential inputs for thermocouple or millivolt input ranges which include types E, J, K, T, R, and S thermocouples and ±100 millivolts. Either 8 inputs are allowed of the same type or 4 each of 2 different types. It includes cold junction compensation with a range of 0-60°C and ±0.5°C accuracy. The 1771-IXEK has a selectable temperature scale of °C or °F with temperature resolution of 1°C or 1°F and millivolt resolution of 10µV. It requires a backplane current load of 750mA at 5V and has a channel update time of 50ms per 8 channels. Its wiring is connected to the 1771-WI field wiring arm, eliminating the need for disconnecting the wires when replacing the module. The 1771-IXEK has a maximum power dissipation of 4.25W and a maximum thermal dissipation of 14.5 BTU/hr. Keying bands must be put between pins 20-22 and pins 24-26 to accept only this module. The 1771-IXEK module has high and low-temperature alarms that are selectable by the user. It contains a green RUN and a red FLT indicator at the front panel for power and fault status. At power-up, it performs self-diagnostics and reports status. The 1771-IXEK provides open-circuit detection in case the thermocouple fails. It automatically calibrates offset and gain for each channel, eliminating the need of potentiometers.