Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_43942 ( "Fieldbus" text, "Bus power" text, "Cabling redundancy" text, "Synchronisation" text, "Sub millisecond cycle" text )

### Question ###
What is the millisecond cycle for the Fieldbus?

### Accurate SQL ###

SELECT "Sub millisecond cycle" FROM table_43942 WHERE "Fieldbus" = 'fieldbus'