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3DI476.6/T B & R Automation

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The B & R Automation 3DI476.6/T is part of the System 2005 Controllers series and has 16 inputs with an input resistance of 4.8 kΩ. The module operates at a nominal input voltage of 24 VDC, features channel-to-PLC and group-to-group isolation, and supports an input filter of up to 1.2 ms. It comes rated with IP20 protection and a total power consumption of 1.5 W.

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Product Description:

B & R Automation manufactures the digital input module 3DI476.6/T for its System 2005 Controllers series. This single-width module receives 24-volt field signals and transfers their logical state to the CPU, giving the automation system fast visibility of sensors, pushbuttons, or limit switches spread throughout a machine. By translating these discrete inputs into controller-ready data, the part helps coordinate sequence logic, interlocks, and diagnostics that keep material-handling and packaging lines operating within defined safety and performance limits.

The module is powered from a nominal control voltage of 24 VDC, and it offers 16 digital input points arranged in four electrically separated groups. An input hardware filter of ≤1.2 ms suppresses contact bounce so the controller receives clean edge information. Field devices can be supplied with up to 30 VDC without damaging the circuitry, while the housing has a protection rating of IP20, indicating finger-safe terminals for cabinet installation. Each channel is isolated from the PLC backplane, yet channels inside the same group share a common potential, while the groups remain galvanically isolated to minimize crosstalk during switching transients.

The overall thermal demand remains at only 1.5 W, so cabinet airflow is rarely a constraint even with continuous operation. Each input is tied to an impedance of 4.8 kΩ, establishing a defined current window for sensors wired as either sink or source devices. The input front end survives transient disturbances of 500 V for 50 µs that may arrive on field cabling at 100 ms intervals, preventing nuisance trips. Channel activity is displayed by per-channel LEDs, simplifying status checks and troubleshooting. Field conductors terminate on a removable 1x TB170 block, allowing rapid replacement of the module without disturbing the wiring harness.

Channel To Channel Isolation
No (same group)
Channel To Plc Isolation
Yes
Group To Group Isolation
Yes
Input Circuit
Sink or source
Input Filter
≤1.2 ms
Input Groups
4
Input Resistance
4.8 kΩ
Maximum Input Voltage
30 VDC
Module Width
Single-width
Nominal Input Voltage
24 VDC
Number Of Inputs
16
Peak Surge
500 V for 50 µs max every 100 ms
Protection Rating
IP20
Status indicators
I/O per channel
Terminal Block
1x TB170
Total Power
1.5 W

Frequently Asked Questions about 3DI476.6/T:

Q: How many digital inputs are available on the 3DI476.6/T module?

A: This module provides 16 digital input channels.

Q: What is the nominal input voltage required by the 3DI476.6/T?

A: The nominal input voltage for this module is 24 VDC.

Q: What isolation features does the 3DI476.6/T module provide?

A: The 3DI476.6/T features isolation between channel to PLC and between groups, but not between channels in the same group.

Q: Are there status indicators present on the 3DI476.6/T module?

A: Each channel on this module has a status indicator for easy monitoring.

Q: What is the maximum input voltage supported by the 3DI476.6/T?

A: The maximum input voltage the 3DI476.6/T can handle is 30 VDC.


Internal Product Review

  • ‘‘The 3DI476.6/T is a System 2005 digital input controller engineered for 16 inputs at a 24 VDC nominal input voltage. Channel-to-PLC isolation and group-to-group isolation support clean signal handling and dependable integration in segmented control architectures. An input filter of ≤1.2 ms gives the module a fast, well-tuned response for discrete automation tasks.’’

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