The Allen-Bradley 1771-E1C is an analog input expander module designed to increase the input capacity of PLC-5 programmable controllers. It fits into the 1771 I/O rack system and offers eight single-ended 12-bit input channels. Each input channel supports selectable voltage ranges from +1 to +5 Volts DC and current ranges including 4-20mA. The module provides high accuracy with a voltage deviation of ±0.05% and current deviation of ±0.07%. Featuring robust over-voltage and current protection, as well as circuit isolation up to 1500V RMS, it ensures dependable operation in industrial settings between 0°C and 60°C. Manufacturer Rockwell Automation Brand Allen-Bradley Part Number 1771-E1C Module Type Analog Input Expander Series PLC-5 Number of Inputs 8 Single-ended Resolution 12-bit Input Voltage Range +1 to +5 V DC Input Current Range 4-20 mA Accuracy ±0.05% (voltage), ±0.07% (current) Isolation 1500 V RMS Circuit Isolation Operating Temperature 0°C to 60°C Status Active / Discontinued (depending on source)
