The Allen-Bradley 1771-IL is a PLC5 isolated analog input module that is compatible for installation with any 1771 I/O chassis. This module has Eight (8) fully isolated differential input channels configurable for Voltage and Current signal ranges such as 1 to 5V dc, 0 to 5V dc, -5 to +5V, -10 to +10V dc, 0 to 10V dc, 4 to 20mA, 0 to 20mA, and -20 to +20mA. This module is used with Block transfer instructions such as BTW and BTR for sending and receiving analog data and instructions.
Technical specifications for 1771-IL
| Manufacturer | Allen Bradley |
|---|---|
| Category | PLCs |
| Product Line | PLC 5 |
| Part Number | 1771-IL |
| Weight | 1.31 lbs (0.60 kg) |
| Number of Inputs & Outputs | 8 Isolated (1000 Volt) Differential |
| Module Type | Analog Input |
| Chassis Compatibility | Any chassis |
| Channel Update/Resolution | 500 ms/8 channels; 15 bits + sign |
| No. of I/O | 8 Differential |
| Data Format | Natural Binary or BDC Scaling to +/- 9999 |
| Resolution | 16-bit binary over full range |
| Backplane Current | 1.3 Amperes |
| Accuracy | Voltage: Typical - 0.01% of full scale range @ 25oC Maximum - 0.05% of full scale range @ 25oC Current: Typical - 0.06% of full scale range @ 25oC Maximum - 0.1% of full scale range @ 25oC (Includes 0.05% when using internal current resistor |
| External Power Required | No |
| Internal Scan Rate | 50 milliseconds for 8 channels |
| Voltage Range | -10 to 10 Volts DC |
| Model Status | Earlier Model |
| Wiring Arm | 1771-WG |
| Current Range | -20 to 20 mA |
| Typical AC Signal Delay (Off) | 24 (+/- 10) ms |
| Typical DC Signal Delay (Off) | 20 (+/- 9) ms |
| Mounting | Rack Mountable |
| Slot Width | 1 Slot |
| UPC | 10612598141620 |
Description
The Allen-Bradley 1771-IL is an analog input module with Eight (8) fully isolated differential input channels. This module belongs to the legacy PLC5 Programmable Logic Controller (PLC) platform that is manufactured by Allen-Bradley. This module is compatible for use with instruments that provides voltage and current signals. Specifically, signal range supported by this controller are 1 to 5V dc, 0 to 5V dc, -5 to +5V, -10 to +10V dc, 0 to 10V dc, for Voltage and 4 to 20mA, 0 to 20mA, and -20 to +20mA for Current signals.
Once an analog input signal is received, the 1771-IL converts the signal to 0000 to +409510 for unipolar ranges (0 to 5V, +1 to +5V, 0 to +20mA, and +4 to +20mA) and -409510 to 409510 for bipolar ranges +5V, +10V, +20mA input ranges. Unipolar refers to a value where counting start at Zero (0). Bipolar refers to a value wherein the maximum positive number has a negative complement. Basically, a unipolar number has no sign while a bipolar number has a sign. This module features 16-bit binary over full range resolution.
The Typical accuracy for Voltage is - 0.01% of full-scale range @ 25 Deg. Celsius while Maximum resolution is 0.05% of full-scale range @ 25 Deg. Celsius. For Current, Typical resolution is 0.06% of full- scale range @ 25 Deg. Celsius while the Maximum resolution is 0.1% of full scale range @ 25oC (Includes 0.05% when using internal current resistor)
The 1771-IL has an integral open circuit detection, Input overvoltage protection and an Auto-Calibration capability.
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