Allen-Bradley/Rockwell Automation 1771-IGD digital I/O module

The Allen-Bradley 1771-IGD is a digital I/O module. This module has sixteen 5V DC TTL current sourcing input points available. The customer supply voltage of this module is 5V DC with +/-0.25V Class 2 and it comes with a maximum peak-to-peak ripple of 50 mV. The input voltage ratings of this module when HIGH = TRUE is 2-5.25V DC for ON and -0.2-0.8V DC for OFF and when LOW = TRUE, it is -0.2-0.8C DC for ON and 2-5.25V DC for OFF. The current sink requirements of this module are a maximum of 7 mA for source per input and a maximum of 0.8 mA for sink per input. The 1771-IGD module's backplane current is a maximum of 130 mA and current rating is 380 mA per module. The isolation voltage is 1500V AC RMS for 1 second. This module has less than 1 ms of input signal delay a power dissipation that ranges from a minimum of 0.4 W to a maximum of 2.7 W and a thermal dissipation that has a minimum of 1.4 BTU/hr. and a maximum of 9.2 BTU/hr. It comes with a 0.5 A 250V normal blow fuse to protect the 5V DC power supply and the input terminal of the module from power surges and other accidental applications of voltage that can cause damage. The 1771-IGD’s operating temperature ranges from 0-60 Deg. Celsius.

The Allen-Bradley 1771-IGD is a TTL input module from the 1771 Product bulleting. This module supports selectable logic states. By default, it is set at positive logic level which detect Logic 1 or On signal state at voltage range of 2.0 - 5.25 Volts DC and Off signal state of -0.2 to 0.8 Volts DC. To set the module to negative-level logic, the jumper setting must be set towards the front of the module. At negative logic-level, the module’s On state voltage range is reversed, -0.2 to 0.8 Volts DC and 2.0 - 5.25 Volts DC for Off-state.

Technical specifications for 1771-IGD

ManufacturerRockwell Automation

Wiring Arm1771-WH

Backplane Current130 mA @ 5VDC

Number of Inputs16

Module TypeTTL Input module

Part Number/Catalog No.1771-IGD

BrandAllen-Bradley

Logic statePositive and Negative Logic (selectable)

Signal Voltage RatingPositive Logic: On = 2.0 - 5.25VDC ; Off = -0.2 to 0.8 VDC Negative Logic: On = -0.2 to 0.8 VDC; Off -2.0 - 5.25VDC

Compatible 1771 chassis:Series A or B 1771-A1B, 1771-A2B, 1771-A3B, 1771-A3B1, 1771- A4B;

Compatible I/O chassis:1771-AM1 / 1771-AM2 Chassis

Signal DelayLess than 1ms

Power Dissipation:2.7 Watts (max); 0.4 Watts (min.)

Operating temperature:32 to 131 F

Voltage Category5 Volts DC, TTL

DC Operating Voltage5.0-5.3 Volts

Max DC Off-State CurrentN/A

Typical DC Signal Delay (On)< 1 ms

Typical DC Signal Delay (Off)20 (+/- 9) ms

Model StatusEarlier Model

Typical AC Signal Delay (Off)24 (+/- 10) ms

MountingRack Mountable