Product Overview

The 1769-HSC is a high-speed counter module from Allen-Bradley. This module belongs to the 1769 Compact I/O family. The 1769-HSC is compatible with CompactLogix and MicroLogix 1500 controllers. It is used to interface signaling devices with high-frequency switching. Specifically, this module is typically used for counter applications, totalizer requirements, and position monitoring and control. Furthermore, the 1769-HSC can directly interface with encoders, pulse output transmitters, and fast sensing devices. Consequently, this module is essential for precision motion control and high-speed counting applications.

Technical Specifications

Manufacturer: Rockwell Automation
Brand: Allen-Bradley
Part Number/Catalog No.: 1769-HSC
Product line: CompactLogix
Module type: High Speed Counter Module
Product type: Counter Module
Series: A and B
Enclosure type: Open
Status: Current Product
UPC/GTIN: 10612598286208

Input Specifications

Number of inputs: 2 quadrature (ABZ) differential inputs
Input frequency: 1 MHz for counter and encoder functions
Input voltage range: 2.6 to 30 V DC
Minimum ON-state current: 6.8 mA
Maximum OFF-state voltage: 1.0 V DC
OFF-state current (leakage): 1.5 mA
Maximum input current: 15 mA
Minimum input current: 6.8 mA
Input impedance: 1950 Ohms
Minimum pulse width: 250 ns
Minimum pulse separation: 131 ns
Minimum phase separation: 131 ns

The 1769-HSC accepts a minimum pulse width of 250 ns and pulse separation of 131 ns. Consequently, this module captures extremely fast signals from encoders and sensors. The differential inputs provide noise immunity for reliable counting in industrial environments.

Output Specifications

Number of outputs: 16 total (4 physical and 12 virtual)
Output voltage range: 5 to 30 V DC
Maximum On-state current per point: 1 A
Maximum On-state current per module: 4 A
User power reverse polarity protection: 30 V DC
Maximum turn-on time: 400 µs
Minimum turn-off time: 200 µs

The 1769-HSC features 4 onboard 5-30 V DC sourcing outputs for high-speed control requirements. These outputs are ideal for position, speed, and motion control applications. The 12 virtual outputs provide additional control capabilities without physical wiring. Therefore, the 1769-HSC offers flexible output configuration for complex automation tasks.

Power and Electrical Specifications

Bus current draw at 5.14 V DC: 425 mA
Bus current draw at 24 V DC: 0 mA
Maximum bus current draw: 5 mA at 5 Volts DC
Backplane current: 1.4 Amps at 24 Volts
Power consumption: 33.6 Watts
Power dissipation: 7.5 Watts
Heat dissipation peak: 6.21 Watts
Power supply distance rating: Module cannot be more than four modules away from a system power supply
Isolation voltage: 75V (continuous), reinforced insulation type, channel-to-system and channel-to-channel
Type tested at: 1200V AC for 2 seconds

The 1769-HSC draws 425 mA from the 5V DC bus. However, it draws no current from the 24V DC bus. The power supply distance rating requires installation within four modules of the system power supply. Consequently, proper power planning is essential for reliable operation of the 1769-HSC.

Physical Dimensions and Weight

Dimension (excluding mounting tabs): 118 x 35 x 87 mm (4.65 x 1.38 x 3.43 in.)
Height including mounting tabs: 138 mm (5.43 in.)
Shipping weight: 130 g (0.286 lb)
Shipping dimensions: 8 x 8 x 5 inches (203 x 203 x 127 mm)
Operating temperature: 0 to 60 °C (32 to 140 °F)
Non-operating temperature: -40 to 85 °C (-40 to 185 °F)
Maximum surrounding air temperature: 40 °C (104 °F)

The 1769-HSC has a compact form factor that saves valuable panel space. The open enclosure type requires installation inside a protected cabinet. The operating temperature range from 0 to 60 °C covers most industrial environments adequately.

Wiring and Cable Requirements

Recommended cable: Individually shielded, twisted-pair cable (or type recommended by encoder or sensor manufacturer)
Wire size (solid copper): 0.32 to 2.1 mm² (22 to 14 AWG)
Wire size (stranded copper): 0.32 to 1.3 mm² (22 to 16 AWG)
Insulation temperature rating: 90 °C (194 °F) maximum
Wiring category: 2 on signal ports

Therefore, use individually shielded twisted-pair cable for optimal signal integrity. The 1769-HSC requires proper cable selection to maintain high-frequency performance. The wiring category 2 rating indicates appropriate isolation requirements for signal ports.

Installation Guidelines

1. First, disconnect all system power before installing the 1769-HSC.
2. Then, verify that the module will be within four modules of the system power supply.
3. Next, mount the module on DIN rail or panel using the mounting tabs.
4. Ensure proper grounding for noise immunity and safety protection.
5. After that, connect the encoder or sensor using individually shielded twisted-pair cable.
6. Wire the 2 quadrature differential inputs according to manufacturer specifications.
7. Then, connect the 4 physical outputs to your field devices.
8. Use wire sizes between 22 and 14 AWG (solid) or 22 and 16 AWG (stranded).
9. Do not install or remove the 1769-HSC under power.
10. Finally, apply power and verify proper module operation.

Packaging List

- 1 x 1769-HSC high-speed counter module
- 1 x Mounting tab hardware kit for DIN rail or panel
- 1 x Installation and configuration instruction sheet
- 1 x Anti-static protective bag for component safety

Common FAQ

1. What is the maximum input frequency of the 1769-HSC?
The 1769-HSC has a maximum input frequency of 1 MHz for counter and encoder functions. Therefore, it captures very high-speed signals accurately.

2. How many outputs does the 1769-HSC provide?
The 1769-HSC provides 16 total outputs. These include 4 physical outputs and 12 virtual outputs for flexible control configurations.

3. What is the power supply distance rating for this module?
The 1769-HSC cannot be more than four modules away from a system power supply. Consequently, plan your rack layout accordingly.

4. Can I remove the 1769-HSC while power is applied?
No, the 1769-HSC does not support removal under power. Therefore, always disconnect power before installing or uninstalling this module.

5. What is the isolation voltage rating of the 1769-HSC?
The 1769-HSC has 75V continuous isolation voltage with reinforced insulation. It is type tested at 1200V AC for 2 seconds for safety certification.