ABB DI821 3BSE008550R1 S800 I/O Systems Digital Input Module

Frequently Asked Questions (FAQ)

Q1: What type of signals does the DI821 module support?
A1: It supports 230 V AC or DC digital input signals.

Q2: Are all input channels on the DI821 module isolated?
A2: Yes, each channel is optically isolated for safety and signal integrity.

Q3: How many input lines can DI821 accept?
A3: The module provides 8 individually isolated digital input channels.

Q4: Does the DI821 module have overvoltage protection?
A4: Each channel includes current limiting and EMC protection, providing overvoltage tolerance.

Q5: How does the voltage supervision function work on channels 1 and 8?
A5: Channel 1 supervises channels 2–4, and channel 8 supervises channels 5–7 unless supervision is disabled.

Q6: Does the module include LED indicators for status?
A6: Yes, it features individual channel status LEDs and indicators for RUN, FAULT, and WARNING.

Q7: Can this module be hot-swapped?
A7: Yes, the module can be replaced during operation, following appropriate safety procedures.

Q8: Does the DI821 support SOE (Sequence of Events) functionality?
A8: No, DI821 does not support SOE. For SOE functionality, models like DI825 are recommended.

3BSE008550R1 ABB DI821 Digital Input Module S800 I/O Systems

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