ABB AZ20/112112221112E/STD Industrial control module

Several additional switch faults independent of the output state are detected and reported as Failed Switch faults on both input and outputconfigured circuits. Examples include loss of communications with the block’s internal microprocessor and some internal power supply faults. Note that in GMR applications, Failed Switch operates differently. See the GMR User’s Manual for details. Open Wire Diagnostic (standard) Indicates electrical (not mechanical) malfunctions on a tristate input. The circuit must have a non-inductive resistor placed as close as practical to the actual dry contacts (such as across the field device terminals), as shown previously. Overload Diagnostic (configurable) If Overload Shutdown is enabled, the block will turn the output off and send an OVERLOAD message if a load exceeds 2.8 Amps DC continuously for 10ms. currents. Exceeding these limits may cause an overtemperature fault.

A load that requires more than 2 Amps DC 

can be configured not to shut off at this level or send the OVERLOAD message. No Load Diagnostic (configurable) If a load does not continuously draw 50mA from the output circuit, the block sends a NO LOAD message. A No Load condition may cause an HHM monitoring the block to display 0 for the circuit although there is voltage at the output and the circuit LED is on. This diagnostic should be not be used for circuits on which very small loads (small relays, transformers, or indicating lamps) will draw less than 50 mA. Note that in GMR applications, No Load operates differently. See the GMR User’s Manual for details.

There are two DC 16-circuit source blocks

 which provide current to field output devices:
24 VDC Source block (IC66*BBD022), for use with 2-wire and 3- wire solid state sensors and electromechanical sensors.
24/48 VDC Source block (IC66*BBD020), for use with 3-wire solid state sensors and electromechanical sensors. There are also two DC 16-circuit sink blocks, which receive current from field output devices:
24 VDC Sink block (IC66*BBD023), for use with 2-wire and 3-wire solid state sensors and electromechanical sensors.
24/48 VDC Sink block (IC66*BBD021), for use with 3-wire solid state sensors and electromechanical sensors.

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