The IB (Instruction Block) command displays the requested instruction block for a job or an asynchronous subroutine. For more information about job processing, refer to the WFL Programming Reference Manual.
Syntax

Explanation
<mix number> IB
Displays the current instruction block of the active job or asynchronous subroutine.
<mix number> IB <number>
Specifies the instruction block indicated by <number>, which can have a value from 1 through 63.
Examples
Example 1
3178 IB INSTRUCTION 07 : MOUNT TAPE SYS/TEST AND START AGAIN.
Example 2
2657 IB 1 INSTRUCTION 01 :PLEASE DS MY JOB IF NO FILE A/B IS PRESENT.