Technical Specifications of 1756-A7 ControlLogix Chassis

General Description The 1756-A7 ControlLogix chassis backplane provides a high-speed communication path between modules and distributes power to each module within the chassis. It supports up to 7 slots and is designed for horizontal mounting.

Backplane Current Ratings

• 1.2V DC: 1.5 A (chassis) / –
• 3.3V DC: 4 A (chassis) / 4 A (slot)
• 5.1V DC: 15 A (chassis) / 6 A (slot)
• 24V DC: 2.8 A (chassis) / 2.8 A (slot)

Power and Isolation

• Power dissipation, max: 4.5 W
• Isolation voltage: Determined by installed power supply and modules

Physical Specifications

• Slots: 7
• Mounting method: Horizontal only
• Cabinet size (HxWxD): 50.8 x 60.9 x 20.3 cm (20 x 24 x 8 in.)
• Weight, approx: 1.10 kg (2.4 lb)
• Location: Panel
• Enclosure type rating: None (open-style)

Wiring Specifications

• Functional Earth Ground: 8.3 mm² (8 AWG) solid or stranded copper wire, rated at 90 °C (194 °F) or greater
• Protective Earth Ground: 2.1 mm² (14 AWG) solid or stranded copper wire, rated at 90 °C (194 °F) or greater

Environmental Specifications

• Temperature, surrounding air: 60 °C (140 °F)
• Temperature, non-operating: -40…+85 °C (-40…+185 °F)
• Relative humidity: 5…95% non-condensing (IEC 60068-2-30)
• Vibration: 2 g @ 10…500 Hz (IEC 60068-2-6)
• Shock, operating: 30 g (IEC 60068-2-27)
• Shock, non-operating: 30 g (IEC 60068-2-27)
• North American temperature code: T5
• IEC temperature code: T5

Immunity and Emissions

• Emissions: IEC 61000-6-4
• ESD immunity: 6 kV contact discharges, 8 kV air discharges (IEC 61000-4-2)
• Radiated RF immunity:
  • 10V/m with 1 kHz sine-wave 80% AM from 80…2000 MHz
  • 10V/m with 200 Hz 50% Pulse 100% AM @ 900 MHz
  • 10V/m with 200 Hz 50% Pulse 100% AM @ 1890 MHz
  • 3V/m with 1 kHz sine-wave 80% AM from 2000…2700 MHz

Summary

The 1756-A7 chassis is designed for efficient communication and power distribution among modules. It supports up to 7 modules, is mounted horizontally, and features robust environmental and immunity protections, making it ideal for various industrial applications.