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The ABB UDD406A (3BHE041464R0101) is a digital-input module designed for use in ABB’s process / industrial automation I/O systems.Nominal signal voltage: 24 V DC for the input circuits.It is
intended for integration into ABB’s DCS/control-system racks or I/O modules, where discrete field-signals must be accepted for logic/monitoring.essentially, the
UDD406A is the module you plug into the I/O rack to accept field digital inputs (at 24 V DC) and feed them into the control system.
It is not a driver module in the sense of analog output or actuator driver,
but a digital input interface module.
Q1: Is the UDD406A an output module or input module?
A: It is a digital input module (designed to accept field 24 V DC signals) rather than a digital output or analog output module.
Q2: What voltage must the field inputs be?
A: The nominal field input voltage is 24 V DC. Input circuitry is designed around 24 V nominal.
Q3: How many channels does the module support?
A: The listing reviewed shows “6” input channels for this specific variant.However: Because
specifications on third-party sites may vary or be incomplete, one should
check the official ABB documentation to confirm exactly how
many channels this variant supports.
Q4: What is the maximum input current per channel?
A: The listing shows a max input current around 5 mA.
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